胰管内乳头状黏液性肿瘤的影像学诊断

目的探讨胰管内乳头状黏液性肿瘤影像学诊断的价值、特征，以及临床特点。方法搜集36例手术证明的胰管内乳头状黏液性肿瘤患者，所有患者术前都接受了CT、MR平扫和增强检查。回顾性分析主胰管型（8例）和分支型（28例）肿瘤的临床特点和影像学表现。结果（1）主胰管型肿瘤的影像表现：主胰管扩张管径〉9mm，呈弥漫或节段性扩张，可伴有壁结节，增强后壁结节不同程度强化；MR胰胆管成像（MRCP）主胰管呈中～重度扩张，其中4例胰管内有扁平状和（或）乳头状的充盈缺损，2例近端胰管明显扩张。（2）分支型肿瘤的影像学表现：肿瘤胰头钩突部多见，呈单房或多房囊状肿瘤，可伴有分隔、壁结节，伴有主胰管扩张；MRCP显示24例内有分隔，15例内有充盈缺损的壁结节，同时清楚地显示19例分支型肿瘤和主胰管之间的交通，以及8例不同程度扩张的主胰管。结论术前正确地诊断胰管内乳头状黏液性肿瘤对手术方式的选择极为重要。MRCP是1种无创、有效地发现和诊断胰管内乳头状黏液性肿瘤的方法。

Imaging diagnosis of intraductal papillary mucinous tumor of the pancreas

Objective To explore the diagnostic value of intraductal papillary mucinous tumor (IPMT)of the pancreas, and to assess its clinical and characteristic radiological features. Methods Thirty-six cases with IPMT who underwent CT and MRI with plain and contrast enhancement before operation were reviewed. The clinical presentation and characteristic imaging findings of main duct type (8 cases)and branch duct type(28 cases) were retrospectively reviewed. Results Typical imaging findings of main duct type were segmental or diffuse dilation of MPD (diameter was over 9 mm) with enhanced mural nodules after contrast medium administration. MR cholangiopancreatography (MRCP) showed dilation of MPD with flat/nodule filling defects in 4 cases and MPD dilatation in the head side in 2 cases. Branch duct type was more frequently located in the head or uncinate. Typical imaging findings of branch duct type were unilocular or multilocular cystic tumors with septa, mural nodules, and MPD dilatation. MRCP showed septa in 24 cases, filling defects in 15 cases, and MPD dilatation in 8 cases. Communication between the cystic lesion and the MPD was demonstrated in 19 cases by MRCP. Conclusion It is extremely important to accurately make the diagnosis of IPMT for planning the surgical strategy. MRCP is a noninvasive and useful method in detecting and making definite diagnosis of IPMT.