Solid XXXX with Unilocular Cyst-Like Appearance on CT: Differentiation from Unilocular Cystic Tumors Using CT.

@entity788 @entity548 @entity5 @entity730 @entity45 @entity12679
OBJECTIVE: To describe the computed tomography (CT) features of @entity5 ( @entity5 ) and solid @entity5 (SPTs) with @entity45 , and to compare them with those of unilocular @entity5 of the pancreas. MATERIALS AND METHODS: This retrospective study was approved by our Institutional Review Board, and informed consent was waived. We included 112 @entity788 with @entity45 on CT (16 @entity5 [nine @entity5 and seven SPTs] and 96 @entity5 [45 @entity12679 , 30 mucinous @entity5 , and 21 branch-duct intraductal papillary mucinous @entity5 ]). Two radiologists reviewed the CT images in consensus to determine @entity5 location, long diameter, morphological features, wall thicknesses, ratio of wall thickness to @entity5 size, wall enhancement patterns, intratumoral contents, and accompanying findings. Fisher's exact test was used to analyze the results. RESULTS: All 16 @entity5 had perceptible walls (mean thickness, 2.7 mm; mean ratio of wall thickness to @entity5 size, 7.7%) with variable enhancement. Four @entity5 and seven SPTs had @entity548 , @entity730 , and/or mural nodules. Six CT findings were specific for @entity5 with @entity45 : a thick (> 2 mm) wall, uneven thickness of the wall, high ratio of wall thickness to @entity5 size, hyper- or hypo-attenuation of the wall in the arterial and portal phase, and heterogeneous internal contents. When three or more of the above criteria were used, 100% specificity and 87.5-92% accuracy were obtained for @entity5 with @entity45 . CONCLUSION: A combination of CT features was useful for distinguishing @entity5 with @entity45 from unilocular @entity5 of the pancreas.
