ABSTRACT
El signo del halo invertido se caracteriza por una opacidad central de vidrio esmerilado rodeado por una consolidación del espacio aéreo más densa en forma de una media luna o un anillo. El signo del halo invertido se ha informado en asociación con un am plia gama de enfermedades pulmonares, incluidas las infecciones fúngicas pulmonares invasivas, neumonía por pneumocystis, tuberculosis, neumonía adquirida en la comuni dad, granulomatosis linfomatoide, granulomatosis de Wegener, neumonía lipoidea y sarcoidosis. También se observa en neoplasmas pulmonares e infarto y después de ra dioterapia y ablación por radiofrecuencia de neoplasias malignas pulmonares. También es conocido como signo de halo en reversa o signo del atolón.
The reversed halo sign is characterized by a central groundglass opacity surrounded by denser airspace consolidation in the shape of a crescent or a ring. The reversed halo sign has been reported in association with a wide range of pulmonary diseases, in cluding invasive pulmonary fungal infections, pneumocystis pneumonia, tuberculosis, communityacquired pneumonia, lymphomatoid granulomatosis, Wegener granulomato sis, lipoid pneumonia and sarcoidosis. It is also seen in pulmonary neoplasms and in farction, and following radiation therapy and radiofrequency ablation of pulmonary malignancies. It is also known as a reverse halo sign or atoll sign
Subject(s)
Tomography, X-Ray Computed , Lung Diseases/diagnosis , Lung Diseases/diagnostic imaging , Radiology , Acquired Immunodeficiency Syndrome , HIVABSTRACT
Objective To compare the performances of endoscopic ultrasonography (EUS) and multislice spiral computed tomography (MSCT) in the preoperative staging of Borrmann type Ⅳ gastric cancer. Methods 48 patients involved in this study, all the patients had undergone surgical resection, Borrmann Type Ⅳ gastric cancer had con-firmed and evaluated by EUS and MSCT. Tumor staging was evaluated by Tumor-Node-Metastasis (TNM) staging. The results from the imaging modalities were compared with postoperative histopathological outcomes. Results The overall accuracies of EUS and MSCT for the T staging category were 54.2 % and 79.2 %( = 0.009), respectively. Stratified analysis revealed that the accuracy of MSCT in T3 and T4 staging was significantly higher than that of EUS ( = 0.032 for both). The overall accuracies of EUS and MSCT for the N staging category were both 56.3%. The sensitivity and specificity of EUS and MSCT in N staging were 83.3 %/72.2 % and 66.7 %/91.7 %, respectively. Conclusion MSCT prevail over EUS for Borrmann Type Ⅳ gastric cancer patients with invasion into serosal layer or adjacent organs or with distant metastasis.
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Objective To explore the CT appearance of thoracic lymphonodus in AIDS patients with immune reconstitution in-flammatory syndrome(IRIS)after highly active antiretroviral therapy (HAART).Methods The data of thoracic CT in 24 AIDS pa-tients after HAART with enlarged thoracic lymphonodus in IRIS were collected,and the chest CT appearance was analyzed.Results Of the 24 cases of AIDS patients with IRIS after HAART,1 9 cases were complicated with pulmonary tuberculosis,which includ-ed 5 cases with cervical tuberculous lymphadenitis,3 cases were co-infected with bacterium and fungi,1 case was infected by penicil-lium marneffei,1 case by pneumocystis carinii.The enlarged thoracic lymphonodus were primarily located in 4R region(20/24), secondly in 2R region(1 1/24)and 4L region(1 1/24),in which the density was uniform or non-uniform,edge clear or unclear,some parts of lymphonodus were fused together but not calcified.The minor axis of enlarged lymphonodus was 1 1.0-25.0 mm except X region,enhanced uniformly in 2 cases.Obstructive pneumonia and pulmonary consolidation were found in 2 cases with enlarged lym-phonodus,which were located in 10R region.Pleural effusion was found in 13 cases with greatest depth of about 22 mm,pericardial effusion was found in 5 cases with greatest depth of about 24 mm.Conclusion The enlarged thoracic lymphonodus in AIDS patients with IRIS affer HAART are mainly involved in the region of 4R,2R and 4L,with or without pleural effusion and pericardial effusion.
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Objective To investigate the clinical values and characteristics of whole body bone ima-ging (SPECT/CT)in detecting bone metastases in the preoperative patients with lung adenocarcinoma or squa-mous cell carcinoma for staging and determining the best treatment plan.Methods Eighty-two preoperative patients with primary pulmonary adenocarcinoma or squamous cell carcinoma performed 99 Tcm-MDP SPECT/CT whole-body bone imaging.One week before surgery,parts of positive lesions performed MRI scan.The differ-ence of the incidence of bone metastasis was analysed by χ2 test.Results In all 82 patients with lung cancer, there were 38 adenocarcinomas and 44 squamous cell carcinomas.Bone metastases were detected in 38 cases, the incidence rate was 46.3%.Of which,among lung adenocarcinoma,the incidence rate was 57.9% (22 /38),and the incidence rate was 36.4% (1 6 /44)in lung squamous cell carcinoma,and the difference was sta-tistically significant (χ2 =1 2.66,P =0.027).The most common area was bilateral ribs,followed by vertebra, pelvis,bones of the extremities and skull.Conclusion Lung adenocarcinoma compared with squamous cell carcinoma is prone to bone metastases,and bone metastases are more common in bilateral ribs.It has important value that whole body bone imaging in screening for bone metastases of pre-operative patients with lung cancer for staging and making the treatment plan.
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Objective:To investigate the effect of segmental Le FortⅠosteotomy and bilateral sagittal split ramus osteotomy ( BSSRO ) on the condyle position in skeletal class Ⅲ malocclusion patients . Methods:In this retrospective study , 19 patients with skeletal class Ⅲmalocclusion who met the inclu-sion criteria were enrolled .All the patients underwent the segmental Le FortⅠ osteotomy and BSSRO . Cone beam computed tomography ( CBCT) scans were performed in the following phases:T1:within one week before the surgeries;T2:within one week post-surgery;T3:three months post-surgery;T4:6 to 14 months post-surgery .The posterior spaces , anterior spaces and the superior spaces of the bilateral tem-poromandibular joints were measured according to the Kamelchuk method respectively .The fossa ratios of the condyle and the distribution of the condyle positions related to the glenoid fossa ( anterior , concentric and posterior position ) were calculated .The results were analyzed statistically .Results:The posterior space , the anterior space and the superior space of bilateral temporomandibular joints in T 2 phase [ right:(2.78 ±1.23) mm, (2.47 ±0.89) mm, (3.07 ±0.85) mm; left: (2.93 ±0.83) mm, (2.69 ± 1.14) mm, (3.44 ±1.16) mm] showed significantly larger spaces than those in T 1 phase [right:(1.81 ±0.95) mm, (1.65 ±0.55) mm, (2.13 ±0.52) mm;left:(2.12 ±1.05) mm, (1.79 ±0.59) mm, (2.15 ±0.93) mm],in T3 phase [right:(2.08 ±1.25) mm, (1.79 ±0.68) mm, (1.80 ±0.76) mm;left: (2.05 ±0.75) mm, (1.99 ±0.94) mm, (2.14 ±0.71) mm] and in T4 phase [right:(1.94 ±0.77) mm, (1.81 ±0.69) mm, (2.05 ±0.69) mm;left:(1.89 ±0.69) mm, (1.80 ±0.61) mm, (2.19 ±0.75) mm], P0.05).The fossa ratio and the condyle position related to the glenoid fossa had no significant difference in all the four phases (P>0.05).The results suggested that the condyle moved downward in T 2 phase and changed to the original pre-surgery position in T3 phase, then keot stable in T4 phase.Conclusion:Segmental Le FortⅠ osteotomy and BSSRO caused significant and transient changes of the condyle position in skeletal class Ⅲmalocclusion patients . However , the condyle tended to move back to the original pre-surgery position and might keep stable .