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@#Although surgical resection remains to be the best treatment strategy for stageⅠnon-small cell lung cancer (NSCLC), percutaneous thermal ablation offers an important option for patients who are unable to undergo surgical resection. Currently, there are three main thermal ablation methods used in the treatment of lung cancer, including radiofrequency ablation (RFA), microwave ablation (MWA) and argon-helium cryoablation (AHC). With the improvement of technique and the accumulation of experience in the treatment of lung cancer, some limitations are disclosed in the initial application of RFA, such as heat sink effect, skin burns and rapid carbonization. These shortcomings have been overcome in the development of MWA and AHC. The feasibility and safety of thermal ablation for the treatment of lung cancer has been demonstrated and its efficacy has been significantly improved (especially for the tumour diameter≤3 cm). This article will focus on the application and recent research developments of these ablation techniques in the treatment of lung cancer.
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Parathyroid adenoma (PTA) is an important cause of hyperparathyroidism (HPT) . The author reported a case of HPT caused by proliferation of parathyroid cells caused by implantation during surgery, and the formation of adenoma in sternocleidomastoid muscle was detected. The understanding of primary hyperparathyroidism (PHPT) caused by ectopic PTA was analyzed from clinical symptoms, laboratory examination, the neck Doppler ultrasound, imaging ( 99TC m-MIBI SPECT/CT fusion imaging, CT) and pathological examination results, combined with the parathyroidism of the patient during the first operation.
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We report a case of functional parathyroid cyst treated by ultrasound-guided anhydrous ethanol sclerotherapy and microwave ablation. The 63-year-old female patient was diagnosed to have functional parathyroid cyst with hypercalcemia, high PTH and cystic space-occupying lesions in the neck by ultrasound, radionuclide scanning and PTH measurement of the cystic fluid. The patient refused to receive cyst resection, and anhydrous ethanol sclerotherapy with microwave ablation was performed under ultrasound guidance. The procedure was completed smoothly without any complications either during or after the operation. Follow-up examination of the patient at 18 months after the operation showed a significant reduction of the mass and normal blood calcium and iPTH levels, demonstrating a clinical cure of the patient. Ablative treatment of functional parathyroid cyst has not been documented so far. This approach provides a minimally invasive treatment modality for such cases where surgical resection is not an option, but its efficacy and safety need to be evaluated in more cases with longer follow-up time.
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Female , Humans , Middle Aged , Microwaves/therapeutic use , Plastic Surgery Procedures , Cysts , Ethanol/therapeutic use , Ultrasonography, InterventionalABSTRACT
Objective To investigate the expression of programmed death ligand 1(PD-L1) in primary tumor cells(TCs) and tumor-infiltrating immune cells(TICs) in patients with liver metastases from colorectal cancer(CRC) and determine its predictive value for recurrence after microwave ablation(MWA) of liver metastases. Methods The paraffin-embedded specimens of 28 patients with CRC liver metastasis were collected retrospectively. The expression of PD-L1 in the primary lesions was detected by immunohistochemistry, and the relationship between PD-L1 and clinical features was analyzed. Recurrence-free survival(RFS) was analyzed by Kaplan-Meier method and Log rank test. Cox proportional hazards regression model was used to analyze the factors influencing recurrence. Results The positive rates of PD-L1 in TCs and TICs in primary CRC were 14.3%(4/28) and 46.4%(13/28), respectively. PD-L1 expression in primary TICs of CRC patients with liver metastases was significantly correlated with the largest hepatic tumor diameter (P < 0.05). PD-L1 expression in primary TICs of CRC patients with liver metastasis was correlated with poor RFS after MWA (P < 0.05). PD-L1 expression in primary TICs and the largest hepatic tumor diameter > 3 cm in CRC patients with liver metastases were the risk factors for recurrence after MWA (P < 0.05). Conclusion PD-L1 expression in primary TICs of CRC patients with liver metastasis may increase the risk of recurrence after MWA for liver metastasis.
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@#Objective To investigate the feasibility and safety of DynaCT microwave ablation (MWA) guided by 3D iGuide puncture technology for lung cancer. Methods The clinical data of 19 patients with primary or metastatic lung cancer who underwent DynaCT MWA from June 2019 to December 2020 in our hospital were retrospectively analyzed, including 15 males and 4 females with an average age of 64.9±11.7 years. The technical success rates, adverse reactions and complications, postoperative hospital stay, and local therapeutic efficacy were recorded. Results Technical success rate was 100.0%. The mean time required to target and place the needle was 15.7±3.7 min and the mean ablation time was 5.7±1.6 min. Thirteen patients underwent biopsy synchronously before the ablation, and 10 (76.9%) patients had positive pathological results. The main adverse reactions were pain (7/19, 36.8%), post-ablation syndrome (4/19, 21.1%) and cough (2/19, 10.5%). The minor complications were pneumothorax (6/19, 31.6%), hemorrhage (5/19, 26.3%), pleural effusion (2/19, 10.5%) and cavity (1/19, 5.3%). Three patients had moderate pneumothorax and received closed thoracic drainage. The median hospitalization time after ablation was 2.0 (2.0, 3.0) d, and no patient died during the perioperative period. The initial complete ablation rate was 89.5% (17 patients) and the incomplete ablation rate was 10.5% (2 patients) at 1-month follow-up, and no local progression was observed. Conclusion DynaCT MWA of lung cancer under the guidance of 3D iGuide system is safe and feasible with a high short-term local control rate, but the long-term efficacy remains to be further observed.
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Objective:To explore the best treatment for local ablation of colon cancer liver metastases (CRLM) by meta-analysis.Methods:The electronic databases of PubMed, Web of Science, Embase, CNKI and the Cochrane Library were searched from the establishment to August 22, 2022, and studies that report outcomes with comparison between microwave ablation (WMA) and radiofrequency ablation (RFA) in CRLM treatment were selected by inclusion and exclusion criteria. Furthermore, the perioperative and survival data were statistically summarized and analyzed by Review Manager 5.3 software.Results:A total of 5 retrospective studies were included with a total sample size of 648 cases, including 316 cases (48.8%) in the WMA group and 332 cases (51.2%) in the RFA group. The results of meta-analysis showed that locoregional recurrence rate in WMA group was significantly lower than that in RFA group. The 1-year and 2-year disease-free survival (DFS) of the WMA group was significantly better than that of the RFA group with HR of 1.77 ( P=0.04, 95% CI: 1.04-3.02) and 1.60 ( P=0.02, 95% CI: 1.09-2.35), respectively. Conclusion:The local control rate and 1-year and 2-year DFS of WMA were superior to RFA.
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Cryoablation (CRA) and microwave ablation (MWA) are two main local treatments for hepatocellular carcinoma (HCC). However, which one is more curative and suitable for combining with immunotherapy is still controversial. Herein, CRA induced higher tumoral PD-L1 expression and more T cells infiltration, but less PD-L1highCD11b+ myeloid cells infiltration than MWA in HCC. Furthermore, CRA had better curative effect than MWA for anti-PD-L1 combination therapy in mouse models. Mechanistically, anti-PD-L1 antibody facilitated infiltration of CD8+ T cells by enhancing the secretion of CXCL9 from cDC1 cells after CRA therapy. On the other hand, anti-PD-L1 antibody promoted the infiltration of NK cells to eliminate PD-L1highCD11b+ myeloid cells by antibody-dependent cell-mediated cytotoxicity (ADCC) effect after CRA therapy. Both aspects relieved the immunosuppressive microenvironment after CRA therapy. Notably, the wild-type PD-L1 Avelumab (Bavencio), compared to the mutant PD-L1 atezolizumab (Tecentriq), was better at inducing the ADCC effect to target PD-L1highCD11b+ myeloid cells. Collectively, our study uncovered the novel insights that CRA showed superior curative effect than MWA in combining with anti-PD-L1 antibody by strengthening CTL/NK cell immune responses, which provided a strong rationale for combining CRA and PD-L1 blockade in the clinical treatment for HCC.
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OBJECTIVE@#To assess the safety and efficacy of"leverage pry-off method"for preventing thermal injury during microwave ablation of benign thyroid nodules.@*METHODS@#From July, 2017 to September, 2019, a total of 348 patients with benign thyroid nodules underwent ultrasound-guided microwave ablation. For protecting from thermal injury during the ablation, "hydrodissection technique" was used in 174 of the patients (admitted from July, 2017 to August, 2018) and "leverage pry-off method" in the other 174 patients (admitted from September, 2018 to September, 2019). All the patients were followed up for 1 to 12 months after the operation for observation of severe complications and nodular residues.@*RESULTS@#Ultrasound-guided microwave ablation was completed in all the 348 patients. The most common severe complication associated with the ablation was voice change, occurring in 3 cases (1.7%) in "hydrodissection technique" group and in 4 (2.3%) in the "leverage pry-off method" group, showing no significant difference between the two groups (P>0.05). During the follow-up, no significant difference was found in the rate of nodular residues between the "hydrodissection technique" group and "hydrodissection technique" group (9.8% vs 10.9% (P>0.05).@*CONCLUSIONS@#The "leverage pry-off method" is simple and effective for preventing thermal injury during microwave ablation of benign thyroid nodules.
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Humans , Microwaves/therapeutic use , Thyroid Nodule/surgery , Burns , Hospitalization , Radiofrequency AblationABSTRACT
Objective:To investigate the safety and efficacy of ultrasound-guided transversus abdominis plane (TAP) combined with paracervical block in percutaneous microwave ablation(PMWA) of uterine fibroids.Methods:Twenty-four patients with uterine fibroids who underwent PMWA after ultrasound-guided TAP combined with paracervical block in Sichuan Cancer Hospital from October 2021 to January 2022 were retrospectively analyzed. The success rate and adverse reactions of TAP combined with paracervical block were recorded, and the types and doses of rescue analgesics used during and after operation were recorded. The pain degree of patients was recorded by NRS(numeric rating scales) during and 30 minutes, 1 hour, 2 hours, 4 hours, 6 hours, 12 hours and 24 hours after operation, and the satisfaction of patients was recorded.Results:The success rate of TAP combined with paracervical block was 100%, and there were no adverse reactions during and after operation. During the operation, 5 patients(20.83%) had mild pain, which was tolerable and did not need intervention, 4 patients(16.67%) presented with moderate pain, and the NRS scores were 4, 4, 5 and 6 respectively, the symptoms were relieved after rescue analgesia. All patients completed one ablation, no ablation failure or secondary ablation. Some patients had mild pain after operation, which could be tolerated without intervention, and all were relieved naturally within 6 hours. All patients returned home on the day of ablation and were 100% satisfied with the analgesic effect.Conclusions:Ultrasound-guided TAP combined with paracervical block in PMWA of uterine fibroids is safe and effective, which is worthy of clinical promotion.
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Objective:To compare the efficacy and safety of ultrasound-guided microwave ablation(MWA) and radiofrequency ablation (RFA) in the treatment of benign thyroid nodules.Methods:The clinical data of 119 patients (187 nodules in total) with benign thyroid nodules who were treated with ultrasond-guided MWA (56 cases) and RFA (63 cases) in Shenzhen Third People′s Hospital from January 2018 to January 2020 were retrospectively analyzed. The ablation time, ablation time per unit volume, volume reduction rate of thyroid nodules after treatment, changes in thyroid function before and after treatment, and incidence of complications were compared between the two groups.Results:The ablation time and ablation time per unit volume in the MWA group were significantly shorter than those in the RFA group (all P<0.05). At 3, 6, and 12 months after treatment, the reduction rate of nodule volume in MWA group was higher than that in RFA group, and the difference was statistically significant in the subgroup with nodule >10 ml (all P<0.05). The incidence of temporary hoarseness in RFA group [6.35%(4/63)]was lower than that in MWA group [12.5%(7/56)], with no statistically significant difference ( P>0.05). Conclusions:Microwave ablation is more effective than radiofrequency ablation in the treatment of large thyroid nodules. Radiofrequency ablation is safer than microwave ablation for thyroid nodules near the risk triangle, but further research is needed to confirm.
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The global incidence of liver cancer has remained elevated for a long time. As a high-risk country for hepatitis B, China has one of the highest rates of liver cancer in the world. Historically, surgical excision has been the recommended method of treatment for early-stage liver cancer. With the advancement of imaging technology and the growing use of physical treatment in clinics in recent years, microwave ablation has emerged as a new treatment option for patients with small hepatocellular carcinoma and those who have missed the chance for surgery. It is less traumatic, requires less time in the hospital, and is less expensive than the traditional surgery. However, due to several current indication limits and the inability to totally avoid postoperative sequelae, microwave ablation is not appropriate for all patients with liver cancer. This article examines the use, combined therapy, and postoperative consequences of microwave ablation in the treatment of hepatocellular carcinoma, as well as the potential future direction of development in the treatment of hepatocellular carcinoma.
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Objective To explore the application value of computed tomography (CT)-based three-dimensional digital navigation technology in microwave ablation of lung cancer. Methods A total of 92 patients with lung cancer in our hospital were retrospectively analyzed, and randomized to receive microwave ablation with the three-dimensional digital navigation technology or traditional CT-guided microwave ablation (three-dimensional navigation group and traditional group). The two groups were paired according to tumor location, size (the maximum diameter difference of less than or equal to 2 mm), and microwave ablation conditions, for a total of 46 pairs. The operation time, times of microwave ablation needle puncture, CT dose index, incidence rates of intraoperative complications, and postoperative lesion control were compared between the two groups. Results The operation time [(30.07 ± 6.36) min vs (47.20 ± 9.65) min], times of puncture [(1.72 ± 0.69) times vs (7.13 ± 3.00) times], CT dose index [(11.16 ± 2.20) mGy vs (26.67 ± 8.72) mGy], and incidence of intraoperative complications (10.87% vs 34.78%) in the three-dimensional navigation group were lower than those in the traditional group, and the response rate was higher in the three-dimensional navigation group than in the traditional group (93.48% vs 71.74%) (P < 0.05). Conclusion CT-guided three-dimensional digital navigation technology for microwave ablation of lung cancer makes the operation of interventional puncture more accurate and safe.
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Objective:To evaluate the risk factors of residual tumor after thermal ablation in patients with small hepatocellular carcinoma.Methods:This was a retrospective study recruiting 107 patients diagnosed as single hepatocellular carcinoma with maximum diameter ≤3 cm from December 2009 to August 2015 in National Cancer Center. The cohort enrolled 81 males and 26 females, including 83 patients younger than 70 years old. All patients were treated with radiofrequency ablation or microwave ablation, and evaluated by CT or MRI after 4-6 weeks compared with baseline data. Potentially related factors were analyzed such as patients′ characteristics, tumor location and adjacent, ablation pattern, hepatitis B/C infection. A multivariate logistic regression analysis was conducted for the independence of risk factors.Results:Six patients (5.6%) with residual tumor was detected in the whole population of 101 cases. Univariate analysis suggested that tumor adjacent to vascular structure, poor differentiation, AFP≥200 μg/L were the risk factors of residue disease (all P<0.05). Multivariate logistic regression suggested that pathological type of poorly differentiated tumor was the only independent risk factor ( HR=2.26,95% CI 0.25-20.50, P=0.030). Conclusions:Poorly differentiated pathology is an independent predictive factor for residual disease in small hepatocellular carcinoma after thermal ablation. Such patients should be routinely followed up after operation.
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Objective:To identify the risk factors for survival prognosis of patients with early-stage hepatocellular carcinoma (HCC) after ultrasound-guided percutaneous microwave ablation (US-PMMA), and to compare the overall survival (OS), cancer specific survival (CSS) and disease-free survival (DFS) between different early-stage HCC patients.Methods:A total of 1 563 patients with early-stage hepatocellular carcinoma (HCC) who underwent MWA in the interventional ultrasound department of the Chiese PLA General Hospital from January 2002 to December 2017 were retrospectively analyzed. Propensity score matching (PSM) balanced the baseline parameters between the elderly group (≥60 years) and the young group (<60 years). Multivariate Cox regression analysis was used to identify the risk factors of OS, CSS and DFS. OS, CSS and DFS probabilities for different patients stratified by respective predictors were calculated with Kaplan-Meier method and compared using the Log-Rank test.Results:All parameters were balanced except for age after PSM.Tumor diameter(95% CI=1.1-1.4, P<0.001), number of tumors(95% CI=1.2-1.9, P<0.001), γ-GT (95% CI=1.0-1.0, P<0.001) and AFP (HR=1.5, 95% CI=1.2-1.8, P<0.001) were shared predictors for OS, CSS and DFS. Age (95% CI=1.2-1.8, P<0.001) and neutrophile to lymphocyte ratio (NLR) (95% CI=1.0-1.0, P=0.043) were another two predictors for both OS and CSS. Albumin predicted OS only, and sex and cirrhosis just predicted DFS. Over the follow-up period (12-156 months), log-rank tests showed that all predictors significantly affected the corresponding OS, CSS or DFS(all P<0.01). Among them, multiple tumors had the greatest impact on OS, CSS and DFS. Compared with patients with single lesion, OS, CSS and DFS in patients with multiple lesions decreased by 9.2%, 2.5% and 4.1% respectively at the 12 years of follow-up, and the median survival time was shortened by 12.3 months, 25.0 months and 11.3 months, respectively (log-rank P=0.049 for OS; P=0.007 for CSS; P<0.001 for DFS). Conclusions:The prognostic benefits from MWA treating early-stage HCC in patients with different survival risk factors are different. Clinically feasible correction of hypoproteinemia and liver disfunction are of great significance to improve the prognosis of early-stage HCC patients after US-PMMA.
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Objective:To explore the mechanism of phase-transition fluorocarbon nanomaterials and evaluate its synergistic efficacy on microwave ablation (MWA).Methods:A novel phase transition nanodroplet (PTN) was designed with poly (lactic-co-glycolic acid) (PLGA) as the shell and perfluorocarbon (PFC) mixture as the core. Based on that, a phase-transition mechanism of microwave droplet vaporization (MWDV) was explored, which was based on the thermal phased transition. The basic physicochemical properties and biological characteristics of PTN were monitored by scanning electron microscope (SEM), dynamic laser light scattering (DLS), in vitro hemolysis and CCK-8 experiment.Based on the gel-hole model experiment in vitro, the phase transition of PTN were monitored; based on the live/dead cell double staining kit, flow cytometry and cytotoxicity test, the synergistic efficacy of phase-transition PTN on microwave ablation, which was mediated by MWDV was evaluated. Results:The phase-transition temperature of PTN was exactly the boundary temperature of microwave ablation (60 ℃) when the ratio between perfluoropentane (PFP) and perfluorohexane (PFH) in the core of PTN was 3∶2. Furthermore, the smart proportional PTN didn′t only have good stability and biocompatibility, but also could enhance the two-dimensional ultrasonic imaging and increase the efficacy of MWA under the mediation of MWDV.Conclusions:MWDV can be treated as a phase-transition mechanism of fluorocarbon nanomaterials, which provides a potential synergistic strategy for the thermal ablation of tumors.
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Objective:To observe the therapeutic effect of microwave ablation combined with anhydrous ethanol for cystic thyroid nodules.Methods:From Jan. 2019 to Dec. 2019, 56 patients with thyroid cystic nodules (≥2cm) underwent ultrasound guided thyroid cystic nodule ablation in Department of Thyroid and Breast Surgery, Nanjing Hospital of Traditional Chinese Medicine. According to different ablation methods, the patients were divided into microwave ablation combined with anhydrous ethanol group and microwave ablation group. There were 36 cases in microwave ablation combined with anhydrous ethanol group and 20 cases in microwave ablation group. The volume reduction rate of thyroid nodules, the incidence of postoperative complications and the changes of thyroid function were compared between the two groups after treatment. Statistical analysis were performed using SPSS, version 21.0, the mean±SD deviation ( ± s) was used to describe the statistics, t-test was performed, and the adoption rate of counting data (%) was expressed by χ 2 test. The difference was statistically significant with P<0.05. Results:The nodule volume reduction rates of the microwave ablation combined with anhydrous ethanol group and microwave ablation group were (49.86±6.78) % vs (22.84±1.88) %, (67.57±5.84) % vs (47.25±7.09) % and (75.70±4.51) % vs (71.14±4.65) % at 3 months, 6 months and 12 months after operation, respectively. There was significant difference between the two groups ( P<0.001) . The incidence of postoperative complications in the two groups was 38.89% and 45.00% respectively, and there was no significant difference between the two groups ( P>0.05) , and all complications were cured within 2 months. There was no significant difference in thyroid function (T3, T4, FT3, FT4, TSH) between the two groups before and 12 months after operation ( P>0.05) . Conclusions:Microwave ablation combined with anhydrous ethanol is more effective in treatment of cystic thyroid nodules (≥2cm) than microwave ablation alone. It can significantly improve patients’symptoms and nodule volume reduction, and does not affect thyroid function. It can be used as a recommended option for treatment of cysticthyroid nodules.
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To investigate the effectiveness and safety of ultrasound-guided microwave ablation (MWA) in treatment of primary hyperparathyroidism (PHPT). A total of 12 PHPT patients with parathyroid adenoma were treated with MWA in Nanjing University of Chinese Medicine Affiliated Hospital of Integrated Traditional Chinese and Western Medicine from May 2019 to February 2021. The patients were followed up once every 3 months for 3-12 months. Levels of serum parathyroid hormone (PTH), calcium and phosphorus were detected before and 20 min, 4h and 1day after ablation, and during follow-up period. The volume and volume reduction rate of parathyroid lesion were compared before the treatment and at the end of follow-up. The technical and clinical success of MWA were assessed as well. At the end of follow-up, median serum PTH [66.60 (42.21,80.03) ng/L vs.169.90 (89.01,396.50) ng/L] and calcium [2.39 (2.32,2.49) mmol/L vs. 2.75 (2.57,2.96) mmol/L] levels in 12 patients decreased significantly (all P<0.05). A complete response in terms of PTH and calcium levels was achieved in 6 of the 12 patients, while 4 of the patients had slightly elevated PTH levels just above the upper limit of normal reference range, and 2 of the patients remained abnormal PTH and calcium levels. The clinical cure rate was 50%. The volumes of all lesion after ablation were significantly decreased ( P<0.05), with the technical success rate reaching 92.3%. No serious complications were observed. Ultrasound-guided MWA, thus, is safe and effective in the treatment of PHPT.
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Objective:To explore the safety and efficacy of laparoscopic microwave ablation combined with partial nephrectomy in the treatment of cystic renal masses.Methods:The 19 patients with cystic renal masses undergoing laparoscopic microwave ablation combined with partial nephrectomy from November 2017 to December 2019 were retrospectively analyzed. There were 13 males and 6 females. The average age was 46.2 years. The mean body mass index was (25.8±3.1) kg/m 2. The masses located in the left kidney in 7 cases and the right kidney in 12 cases. The ECOG scores were 0. The mean maximum diameter of the tumors was (2.8±1.3) cm. Five cases were diagnosed with Bosniak Ⅲ and 14 cases with Bosniak Ⅳ. According to R. E.N.A.L. scoring, 11 cases were of low difficulty (4-6 points), 7 cases of medium difficulty (7-9 points) and 1 case of high difficulty (10-12 points). The cystic renal masses were ablated by laparoscopic microwave ablation, then followed by partial nephrectomy. Postoperative complications were observed and the prognosis was assessed by CT or MRI. Results:The mean duration of operation was (84.0±20.8) min. The median intraoperative blood loss was 20 (10-50) ml. The median duration of postoperative hospitalization was 3 (2-6) d, and no complications such as bleeding, infection, gross hematuria or urine leakage were observed. According to the malignant degree of cystic renal masses, the patients were divided into low-risk group and high-risk group. The patients with benign cystic kidney tumors or with low biological malignancy were considered as the low-risk group, while the patients with high malignant pathology were considered as the high-risk group. In the low-risk group, there were 4 patients, including 1 patient with papillary adenoma, 1 patient with renal angiomyolipoma, 1 patient with low-grade malignant potential multilocular cystic renal tumor, and 1 patient with renal chromophobe carcinoma (stage T 1a). In the high-risk group, there were 15 cases, including 14 cases of clear cell renal cell carcinoma (AJCC pathological stage: T 1a stage 11 cases, T 1b stage 3 cases; WHO/ISUP classification: 7 cases in grade 1, 6 cases in grade 2, and 1 case in grade 3); 1 case of Type 2 papillary renal cell carcinoma (stage T 1b, grade 2). The median follow-up was 20 months (12-37 months). Both groups survived, and no signs of tumor recurrence, implantation or metastasis were found in chest and abdomen imaging. Blood tests were performed regularly, and no significant abnormalities occurred. Conclusions:The safety and efficacy of laparoscopic microwave ablation combined with partial nephrectomy for the treatment of cystic renal masses is satisfactory, and postoperative pathology is clear, providing a potential option for cystic renal masses treatment.
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Objective:To investigate the effect and influencing factors of microwave ablation (MVA) in the treatment of benign thyroid nodules.Methods:The clinical data of ultrasound-guided microwave ablation for thyroid benign nodules in the Second Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine from April 2017 to April 2019 were retrospectively analyzed. At 1, 3 and 6 months after operation, conventional ultrasound examination was performed to calculate the volume reduction rate of the nodules. The nodules were divided into groups according to gender, age, nodule blood supply, nodule size, nodule nature and Hashimoto′s thyroiditis background, and the related factors influencing microwave ablation were analyzed.Results:68 patients (106 nodules) with benign thyroid nodules were treated with microwave ablation. The volume of benign thyroid nodules after the MWA treatment was significantly reduced after 1, 3, 6 months, and their nodule volume reduction ratio (VRR) were (39.7±6.1)% (1 months), (56.2±5.9)% (3 months), (70.3±5.4)% (6 months), respectively. There were significant differences in the volume reduction ratio of nodules at 1, 3 and 6 months after operation among different nodule size, nodule nature and Hashimoto′s thyroiditis background, with statistically significant difference ( P<0.05). However, there was no significant difference in the reduction ratio of nodules in different gender, age and nodule blood supply at 1, 3 and 6 months after operation ( P>0.05). Pearson correlation analysis showed that VRR was negatively correlated with ablation time per unit volume, with statistically significant difference ( P<0.05). Logistic regression analysis indicated that only nodule nature and ablation time per unit volume entered the regression equation. Conclusions:The size and nature of the nodules, Hashimoto′s thyroiditis background and ablation time per unit volume will affect the postoperative volume reduction rate.
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The feasibility of ultrasound backscatter homodyned K model parametric imaging (termed homodyned K imaging) to monitor coagulation zone during microwave ablation was investigated. Two recent estimators for the homodyned K model parameter, RSK (the estimation method based on the signal-to-noise ratio, the skewness, and the kurtosis of the amplitude envelope of ultrasound) and XU (the estimation method based on the first moment of the intensity of ultrasound,