Diagnosis of recurrent or residual nasopharyngeal carcinomas in the skull base area with F-18-fluoro-deoxyglucose positron emission tomography / 中华耳鼻咽喉头颈外科杂志

<p><b>OBJECTIVE</b>To investigate the diagnostic value of F-18-fluoro-deoxyglucose positron emission tomography (FDG-PET) for the recurrent or residual nasopharyngeal carcinomas in the skull base area.</p><p><b>METHODS</b>Nine post-irradiation nasopharyngeal carcinoma patients did FDG-PET scanning, CT/MRI imaging and underwent nasopharynx and skull base-biopsy under endoscopy. The results of FDG-PET were evaluated and compared with CT/MRI studies and biopsies.</p><p><b>RESULTS</b>In 9 cases of post-irradiation nasopharyngeal carcinoma, CT/MRI detected 7 recurrent cases and 2 suspected recurrent cases in occipital bone and clivus. All 9 cases had accumulated FDG in nasopharynx and cranial base. A definite diagnosis was made by biopsy, 3 cases were confirmed recurrence, and others 6 cases were proved mucous chronic inflammation and (or) osteoradionecrosis. The accuracy of FDG-PET was 33.3% (3/9), and the false positive rate was 66.7% (6/9).</p><p><b>CONCLUSIONS</b>Diagnosis of recurrent or residual nasopharyngeal carcinomas in the skull base area with FDG-PET had high false-positive rate, final diagnosis must depend on histopathologic examination under endoscopy.</p>

MR cholangiopancreatography and MR imaging in the diagnosis of extrahepatic cholangiocarcinoma / 中华肿瘤杂志

<p><b>OBJECTIVE</b>To evaluate the imaging features of MR Imaging (MRI) and MR cholangiopancreatography (MRCP) and their clinical value in the diagnosis of extrahepatic cholangiocarcinoma.</p><p><b>METHODS</b>MRI was performed in 54 patients with extrahepatic cholangiocarcinoma proved surgically and pathologically, MRCP in 44 patients, Gadolinium-enhanced in 29 patients. MRI, MRCP and pathological findings were analyzed retrospectively.</p><p><b>RESULTS</b>By MRI, the mass was shown (n = 39) and all bile duct thickened (n = 13) in extrahepatic cholangiocarcinoma. Gadolinium-enhanced ones revealed calcified focus (n = 22). By MRCP, interrupted, abruptly cut-off or cone-like changes of the bile duct (n = 16), beak-like or mouse tail changes (n = 26) or tumbler mouth appearance (n = 2) were shown. The bile duct distal to the obstruction was observed in 29 patients. Of the 54 patients examined by MRI in combination with MRCP, correct tumor localization was made in 52 (96.3%) and correct judgement of tumor nature in 50 (92.6%).</p><p><b>CONCLUSION</b>Conventional MRI is an effective supplement to MRCP in the diagnosis of extrahepatic cholangiocarcinoma. MRCP combined with MRI is able to significantly improve the diagnostic accuracy of MR examination.</p>

Analysis of hepatic vein variations in healthy people with 64-slice spiral CT / 中华放射学杂志

Objective To analyze variations of hepatic vein in healthy people with 64-slice spiral CT.Methods Seventy-five healthy subjects underwent multi-slice spiral computed(MSCT)hepatic venography.The anatomy of the junction of the hepatic veins with the inferior vena cava and the intrahepatic drainage territory of the hepatic veins and tributaries were evaluated.The hepatic veins were classified according to three anatomic classification(Nakamura's,Marcos's and Kawasaki's classification)methods respectively.Results There was a common trunk of the middle and left hepatic veins before joining the IVC in 86.7%(65/75)of the cases.In 13.3%(10/75)of the cases,the three main hepatic veins joined the IVC separately.The ratios of Nakamura's classification type A,B,C of hepatic veins were 49.4% (37/75),37.3%(28/75),and 13.3%(10/75)respectively.The ratios of Marcos's classification type A,B,C of hepatic veins were 56.0%(42/75),24.0%(18/75),and 20.0%(15/75)respectively. The ratios of Kawasaki's classification type Ⅰ,Ⅱ of hepatic vein were 40.0%(30/75)and 60.0% (45/75).Conclusion Multi-slice spiral CT hepatic venography can provide visualization of peripheral hepatic venous branches in details.