Clinical utility of transanal indocyanine green near-infrared fluorescence imaging for evaluation of colorectal anastomotic perfusion.

BACKGROUND: Although indocyanine green (ICG) fluorescence imaging has been reported to be useful for assessing colorectal perfusion, unstable quantification remains an issue. We performed ICG fluorescence observation from the luminal side and examined the usefulness of the transanal approach. METHODS: A total of 69 patients who underwent left-side colon surgery were enrolled in this cohort study. After the anastomosis had been constructed, ICG 0.2 mg/kg was injected intravenously. The anastomotic site was then observed by a scope inserted transanally. The following items were examined in the areas of the anastomotic site with the highest- and lowest-fluorescence intensity: maximum fluorescence (Fmax), time from ICG injection to Fmax (Tmax), time from start of dyeing to Fmax (ΔT), and the contrast pattern of the mucosa. RESULTS: Anastomotic leakage (AL) occurred in nine cases. Tmax and ΔT values of the lowest-fluorescence area in the distal intestine showed significant differences in the cases with AL (P = 0.015 and P = 0.040, respectively). Regarding the contrast pattern of the mucosa of the lowest-fluorescence area in the proximal and distal intestine, the patients in whom the vessels were not depicted in the area had a significantly higher incidence of AL than those in whom vessels were depicted in the area (P = 0.031 and P = 0.030, respectively). Some of the areas in which vessels were not depicted by ICG fluorescence observation from the luminal side corresponded to the points of leakage. There were heterogeneous changes that might not be grasped by observation from the serosal side. CONCLUSION: Transanal ICG fluorescence imaging can evaluate perfusion over the entire circumference of the anastomosis in detail and aid in assessing the risk of AL. Therefore, the examination of the detailed low-perfusion area enables us to take measures for AL and to search for safer operative managements.

Comparison of Efficacy of Self-Expandable Metallic Stent Placement in the Unresectable Esophageal Cancer Patients.

This is a retrospective study to evaluate the prevention of complications of metallic stent placement in patients with unresectable advanced esophageal cancer. A total of 87 patients were treated with 4 types of metal stents in the esophagus over a period of 18 years. Stent placement was technically successful. The most common prior treatment was chemoradiotherapy. There were no significant differences in the rate of patients with no complications among the prior treatments. Approximately, 30% of patients had the most common chest pain in complications. Stent placement within one month after the completion of chemoradiotherapy should be avoided for the prevention of the chest pain. There was no significant difference in the rate of patients with no complications by lesion location. The rate of no complications was higher for the Niti-S stent than the Gianturco Z-stent or Ultraflex stent. Of note, no complications were noted for the Niti-S ultrathin stent at all. Among cases of stent-related death, the most common type of complication was respiratory disorder caused by the stent that seems to be thick and hard. Therefore, the stent with thin and flexible characteristics like the Niti-S ultrathin stent will solve the various problems of esophageal stent placement.

Endoscopic occlusion with silicone spigots for the closure of refractory esophago-bronchiole fistula after esophagectomy.

A 65-year-old man with cT1bN0M0 stage I middle thoracic esophageal cancer underwent subtotal esophagectomy and gastric tube reconstruction through the posterior mediastinal route after preoperative carbon-ion radiotherapy and chemotherapy in a clinical trial. Anastomotic leakage occurred, but it spontaneously improved. At six months after the operation, he was rehospitalized with a cough and dysphagia. An esophago-bronchiole fistula and stenosis of the gastric tube were observed. He first underwent stent placement in the gastric tube. Two weeks later, the syringeal epithelium was burned by argon plasma coagulation after stent removal. Endoscopic occlusion was then performed for the fistula with two guidewire-assisted silicone spigots. Two weeks later, he was discharged on an oral diet, and he has not developed recurrence of the fistula or cancer for three years. This is the first report of endoscopic occlusion with a guidewire-assisted silicone spigot through the esophagus.

[Optimal Dissection of the Intestinal Tract and Preservation of Vascular Supply in Left Hemicolectomy Using Simulation Computed Tomography Colonography].

Left hemicolectomy is a standard surgical method for cancer of the descending colon. Resection involves the region from the left side of the transverse colon to the sigmoid colon. Although laparoscopic hemicolectomy is widely used, it is difficult to determine an appropriate resection range during surgery because of the limited visual field. Simulation computed tomography colonography(S-CTC), which combines CTC and 3-dimensional vascular imaging, enables the surgeon to clearly identify the position of the primary lesion and dominant vessel. We present 3 cases of cancer of the descending colon with different affected sites and lesion grades, in which appropriate dissection of the large intestine and treatment of the vessels was simulated by S-CTC, enabling laparoscopic surgery in accordance with the simulation. Case 1: Splenic flexure, cT1bN0M0, Stage I . The dominant vessels were identified by S-CTC as accompanying vessels branching from the accessary middle colic artery(A-MCA)and inferior mesenteric vein(IMV). The left branch of the MCA and the left colic artery(LCA)were 10 cm or more apart. A D2-type dissection was performed, and simulation was conducted for dissection of the branching root of the vein and the same level of the A-MCA. Case 2: Mid-descending colon, cT3N0M0, Stage II . The dominant A-MCA and LCA were identified with S-CTC. The intestinal tract was dissected to 5 cm from the dominant artery, and D3-type dissection was simulated with a retained inferior mesenteric artery(IMA)for preservation of the sigmoid colon. Case 3: Site adjacent to the sigmoid colon, cT3N0M0, Stage II . S-CTC identified the first sigmoid artery(S1)as the dominant artery, and revealed that the LCA and IMV were defective and that the A-MCA was 10 cm or more apart. Simulation of S1 selective resection was conducted such that D3-type dissection was performed, with a retained IMA for preservation of the sigmoid colon. In all 3 cases, laparoscopic surgeries were performed in accordance with the simulation. S-CTC was useful for optimal preservation of the intestinal tract and vascular supply in laparoscopic surgery for descending colon cancer.

Drill needle aspiration biopsy for submucosal tumors in an experimental study.

BACKGROUND AND AIMS: EUS-guided FNA biopsy has been widely performed to aid in the diagnosis of submucosal tumors (SMTs). However, in cases of small tumors, the diagnostic yield of EUS-FNA is poor. Therefore, it is necessary to develop a new needle for the diagnosis. We developed a device with a new mechanism that we refer to as a drill needle aspiration biopsy (DNAB). The aim of this study was to evaluate the use of DNAB in resected gastric SMT specimens. METHODS: A drill needle with a sharp tip and wide ditch was inserted into a catheter for angiography. Continuous suction is enabled through the catheter at the tip. DNAB was performed with one pass and one stroke in 13 gastric SMTs resected by operation. Similarly, FNA was performed by one pass and ten strokes. These gastric tumors included nine diagnosed gastrointestinal stromal tumors and four undiagnosed SMTs by preoperative examinations. The tissue quantity between DNAB and FNA was macroscopically and microscopically examined. RESULTS: All 13 drill biopsy specimens were obtained. Additionally, all 13 gastric SMTs, including 4 undiagnosed tumors, could be diagnosed by DNAB. The quantity of each specimen obtained by DNAB was macroscopically and microscopically much greater than that by FNA. In particular, for tumors <25 mm in the longer axis, the ratio of microscopic diagnosable cases was 100 % (7/7) for DNAB and 42.9 % (3/7) for FNA. CONCLUSIONS: DNAB is a novel method that can obtain more tissue than FNA for small gastric SMT.

Assessment for diagnosis of lymph node metastasis in esophageal cancer using endoscopic ultrasound elastography.

BACKGROUND: We performed endoscopic ultrasound real-time tissue elastography to more accurately diagnose lymph node metastasis of esophageal cancer. The aim of this study was to evaluate the ability of EUS elastography to distinguish benign from malignant lymph nodes in esophageal cancer patients. METHODS: The present study had two steps. As the first step (study 1), we developed diagnostic criteria for metastatic lymph nodes using elastography and verified the validity of the criteria. Three hundred and twenty-two lymph nodes from 35 patients treated by surgical resection were included in the study. As the second step (study 2), we preoperatively examined the lymph nodes of esophageal cancer patients with EUS elastography and compared its diagnostic performance with that of the conventional B-mode EUS images. A total of 115 lymph nodes from 31 patients were included. RESULTS: In study 1, lymph nodes were considered malignant if 50 % or more of the node appeared blue, or if the peripheral part of the lesion was blue and the central part was red/yellow/green. The sensitivity and specificity of the elastography were 79.7 and 97.6 % with an accuracy of 93.8 %, which was significantly higher than the values for conventional B-mode imaging. In study 2, the sensitivity and specificity of the EUS elastography were 91.2 and 94.5 % with an accuracy of 93.9 %, which was also significantly higher than the values for conventional B-mode EUS imaging. CONCLUSIONS: The present study demonstrated that EUS elastography is useful for diagnosing lymph node metastasis of esophageal cancer.

A case of giant ileal duplication in an adult, successfully treated with laparoscope-assisted surgery.

Alimentary tract duplication is a rare congenital malformation but can occur anywhere along the digestive tract. Most patients become symptomatic in early childhood, and only a few cases of adult patients have been reported in the literature. We herein report a unique case of a giant ileal duplication in an adult, which was successfully treated with laparoscope-assisted surgery. A 60-year-old male was admitted because of abdominal pain. Imaging studies revealed a well-defined cystic mass, measuring 15 cm, in the ileocecal region. We diagnosed it as a duplicated ileum and performed laparoscope-assisted surgery. The duplication was successfully resected with attached normal ileum, and there were no major complications in the postoperative course.

[Perioperative Steroid Administration for Colorectal Cancer with Synchronous Unresectable Hepatic Metastases].

PURPOSE: In our institution, steroids are administered before resection of primary colorectal cancer lesions with synchronous unresectable hepatic metastases in order to avoid severe postoperative complications and hepatic failure. We herein report the results of the treatment. PATIENTS AND METHODS: Thirty-eight colorectal cancer patients with synchronous unresectable hepatic metastases were divided into 2 groups: Group S (patients who received steroids in the perioperative period) and Group N (other patients). The clinicopathological features, post-operative course, and survival were compared between the 2 groups. Hydrocortisone sodium succinate was administered twice a day from immediately before laparotomy until the second postoperative day. RESULTS: The number of patients with severe hepatic metastases and extra-hepatic metastases was significantly higher in Group S. No significant differences were observed between the 2 groups regarding the incidence of severe postoperative complications or the overall survival. Among 25 patients with liver dysfunction, the complication rate was significantly lower and survival was significantly longer in Group S compared to Group N. CONCLUSIONS: The perioperative administration of steroids to colorectal cancer patients with synchronous unresectable hepatic metastases may reduce the complication rate and may thus improve survival, especially in patients with liver dysfunction.

[Surgical Simulation-CT Colonography for Laparoscopic Assisted Sigmoid Colectomy Preserving the Inferior Mesenteric Artery and Vein].

D2 lymph node dissection in laparoscopic surgery for early colon cancer requires selective vessel dissection, making it technically very difficult. Using surgical simulation-CT colonography (simulation-CTC), we could perform laparoscopic assisted sigmoid colectomy preserving the inferior mesenteric artery (IMA) and vein (IMV) more accurately and safely. The case described here was a type 0-Ip sigmoid colon cancer with a tumor size of 13 mm. Endoscopic mucosal resection was performed to confirm a pathological diagnosis of pT1b (4,000 mm) and v1. Sigmoid colectomy was planned, and simulation-CTC was performed, which demonstrated that the cancer was located in the proximal sigmoid colon and supplied by the first sigmoid colon artery (S1). To maintain the blood flow to the distal sigmoid colon, selective S1 resection preserving the IMA and IMV was planned. At the operation, S1, which branches off from the IMA near the bifurcation of the abdominal aorta, was dissected, and the vein accompanying S1, which branches from the IMV in the same area as S1, was dissected. The operation was performed accurately according to the plan, showing that simulation-CTC can be very useful.

Laparoscopy in the management of hilar cholangiocarcinoma.

The use of minimally invasive surgery has become widely accepted in many gastrointestinal fields, even in patients with malignancy. However, performing laparoscopic resection for the treatment of hilar cholangiocarcinoma is still not universally accepted as an alternative approach to open surgery, and only a limited number of such procedures have been reported due to the difficulty of performing oncologic resection and the lack of consensus regarding the adequacy of this approach. Laparoscopy was initially limited to staging, biopsy and palliation. Recent technological developments and improvements in endoscopic procedures have greatly expanded the applications of laparoscopic liver resection and lymphadenectomy, and some reports have described the use of laparoscopic or robot-assisted laparoscopic resection for hilar cholangiocarcinoma as being feasible and safe in highly selected cases, with the ability to obtain an adequate surgical margin. However, the benefits of major laparoscopic surgery have yet to be conclusively proven, and carefully selecting patients is essential for successfully performing this procedure.

Performing simple and safe dunking pancreaticojejunostomy using mattress sutures in pure laparoscopic pancreaticoduodenectomy.

BACKGROUND: Although recent technological developments and improved endoscopic procedures have further spread the application of laparoscopic pancreatic resection, laparoscopic pancreaticoduodenectomy still presents major technical difficulties, such as when performing pancreatic-enteric anastomosis. METHODS: Laparoscopic dunking pancreaticojejunostomy using mattress sutures was performed in 15 consecutive patients with a soft pancreas and a nondilated pancreatic duct between October 2011 and December 2012. RESULTS: According to the International Study Group on Pancreatic Fistula criteria, 3 patients developed PF (grade A), whereas the remaining 12 patients did not. CONCLUSIONS: Dunking pancreaticojejunostomy using mattress sutures is considered to be a feasible and safe method for performing pure laparoscopic pancreaticoduodenectomy.

[A case of rectal gastrointestinal stromal tumor (GIST) locally resected after long-term chemotherapy with imatinib mesylate].

We report a case of gastrointestinal stromal tumor (GIST) locally resected after long-term chemotherapy with imatinib mesylate. A 78-year-old woman was diagnosed with GIST in the lower rectum on screening colonoscopy for anemia. The tumor was 7 cm in diameter, and the anal sphincter was considered to be difficult to preserve due to the extent of the tumor. The patient refused surgery, so she was administered imatinib mesylate chemotherapy. The medication was continued for 5 years without any major adverse events, and the status of the tumor was stable. Five years later, she underwent transanal local resection for anal prolapse and incarceration of the tumor. Pathological findings revealed a 7 cm sized high-risk GIST. The long-term stable status of the tumor was maintained, and the anal function was preserved by the local resection.

Rapid diagnosis of micrometastasis of gastric cancer using reverse transcription loop-mediated isothermal amplification.

Methods to detect metastases in biopsy specimens with certain rapidity and accuracy are essential to performing tailor-made surgeries for solid malignancies. Reverse transcription loop-mediated isothermal amplification (RT-LAMP) reaction is a novel technique for detecting mRNA expression of target sequences with high sensitivity and rapidity, even from crude samples without RNA purification. Applicability to detect lymph node (LN) micrometastasis of gastric cancer was tested. Total of 26 LNs were retrieved from 10 patients with primary gastric cancer. Each LN was serially sectioned, and every set of three serial sections were tested for routine histopathological (H&E) and immunohistochemical examination with anti-cytokeratin antibodies (IHC), and RT-LAMP analysis targeted cytokeratin 19 mRNA. Results from H&E/IHC and RT-LAMP analysis were compared in each set of sections. All the sections of those containing metastatic lesions equivalent to a volume of overt metastasis (maximum diameter>2 mm), 90% of those containing micrometastasis (between 2 and 0.2 mm) and 83% of those containing isolated tumor cells (<0.2 mm) were detectable using this procedure. Total analysis from lysates of clinical specimens required<75 min. This new technique is suggested to be an alternative to rapid diagnosis of micrometastasis based on conventional histopathological analysis.

Salivary amylase activity is useful for assessing perioperative stress in response to pain in patients undergoing endoscopic submucosal dissection of gastric tumors under deep sedation.

BACKGROUND: Although endoscopic submucosal dissection (ESD) for patients with gastric tumors under the conditions of unconsciousness is considered to be minimally invasive, no objective assessment of the perioperative stress of ESD has yet been conducted. Today, stress levels can be easily and objectively assessed by monitoring salivary amylase activity (sAMY). We evaluated the perioperative changes in the sAMY in patients undergoing ESD and identified the causes of such changes. METHODS: A total of 40 patients with gastric cancers/adenomas removed by ESD under general anesthesia (GA; n = 20) and under deep sedation (DS; n = 20) were enrolled. sAMY was measured using the enzyme analysis equipment, sAMY Monitor (NIPRO, Osaka, Japan) during the perioperative period of the ESD. Also, all patients were interviewed to determine their subjective stress level, using a questionnaire asking "How did you feel during ESD?", with the choice of responses ranging from "did not wake up at all" to "I was awake and ESD was extremely stressful". RESULTS: The sAMY of the DS group increased soon after the start of ESD. Meanwhile, that of the GA group decreased just after the ESD started and was maintained at a stable level throughout the ESD. In response to the stress level questionnaire, all of the patients in the GA group and a majority of the patients in the DS group responded, "did not wake up at all". CONCLUSION: Sympathetic agitation, expressed as an increase of sAMY, was absent in the GA group. Meanwhile, in the DS group, some patients showed high levels of sAMY which went down following the administration of an analgesic agent, thus suggesting that pain caused an elevation in the level of the stress and thereby induced an increase in sAMY. The measurement of sAMY is therefore considered to be useful for the assessment of analgesic status under DS.

Successful resection of a liver metastasis from AFP-producing pancreatic cancer resulting in long-term survival: a case report and review of literature.

The prognosis of patients with alpha-fetoprotein (AFP)-producing pancreatic cancer is generally very poor. We, however, present a case of a 33-year-old man who survived AFP-producing pancreatic cancer and its metachronous liver metastasis. The patient had undergone a curative total pancreatectomy for AFP-producing pancreas head cancer invading to the tail, which was postoperatively confirmed by immunohistochemical staining of the resected specimen. At 1 year and 4 months after the operation, the serum AFP level was elevated to 26 ng/mL, and a 2.6 cm-sized mass was found in the lateral segment of the liver. He underwent lateral segmentectomy, and the tumor was histopathologically diagnosed as having metastasized from the AFP-producing pancreatic cancer removed earlier. The patient is doing well 8 years and 5 months after resecting the liver metastasis, with no signs of recurrence. This case suggests that surgery may also be a treatment of choice for patients with liver metastasis from AFP-producing pancreatic cancer, particularly for those with a metachronous and solitary tumor. It should be remembered that some pancreatic cancers produce AFP and that monitoring of postoperative serum AFP levels in such cases will be useful for early detection of recurrence and selection of appropriate surgical intervention.