OBJECTIVE: Primary @entity4153 ( @entity4153 ) is a rare aggressive @entity1494 , with identical histopathology to that of the lung. The treatment and prognosis of @entity150 are somewhat different from those of more frequent transitional cell @entity189 . The purpose of this study was to analyze the CT and MR imaging findings of @entity150 . MATERIALS AND METHODS: Six adult @entity1 (five males and one female) with pathologically proven @entity4153 of the urinary bladder who had undergone pelvic CT and/or MR imaging were included in this study. The radiologic findings were retrospectively evaluated in terms of @entity5 location, texture, calcification, depth of invasion, perivesical extension, lymph node involvement, and local or distant @entity3 , by two radiologists, who established a consensus. RESULTS: CT and MR images depicted all @entity5 as large, ill-defined, relatively well enhancing, broad-based polypoid intramural masses with (n=3) or without (n=3) cystic portions. Their frequent location was posterior and trigonal (n=3). Calcification was found within one @entity5 , and @entity3329 in four. At T2-weighted MR images, the solid portion of the @entity5 was relatively hypointense. The stage at the time of diagnosis was C in three @entity1 , and D1 in three. Follow-up imaging showed brain @entity3 in one @entity1 and liver @entity3 in two. CONCLUSION: On CT and MR images, @entity4153 of the urinary bladder appeared as a large, enhancing, broad-based polypoid mass. It was stage C or higher, and lymph nodes and distant @entity3 were frequent. T2-weighted MR images showed that the solid portion of the @entity5 was relatively hypointense. When radiologic examinations demonstrate a @entity150 of this kind in adults, @entity4153 of the urinary bladder should be included in the differential diagnosis.

XXXX : CT and MR imaging findings.

@entity1 :: ('9606', 'Species') :: ['patients', 'patient'] @entity3329 :: ('MESH:D008206', 'Disease') :: ['lymphadenopathy'] @entity4153 :: ('MESH:D018288', 'Disease') :: ['small cell carcinoma', 'SCC'] @entity1494 :: ('MESH:D001745', 'Disease') :: ['malignancy of the urinary bladder'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor', 'tumors'] @entity189 :: ('MESH:D002277', 'Disease') :: ['carcinoma'] @entity150 :: ('MESH:D001749', 'Disease') :: ['bladder tumor', 'bladder SCC'] @entity3 :: ('MESH:D009362', 'Disease') :: ['metastasis']
@entity150 :: (MESH:D001749,Disease) :: ['Small cell carcinoma of the urinary bladder']
