Characteristics of the Peritumoral Pseudocapsule Vary Predictably With Histologic Subtype of T1 XXXX .

@entity8880 @entity1637 @entity5 @entity1358 @entity37694 @entity703
OBJECTIVE: To determine characteristics of the peritumoral pseudocapsule (PC) between @entity703 subtypes. METHODS: The peritumoral PCs of 160 pT1 @entity703 were examined, including 60 @entity1358 ( @entity1358 ), 50 papillary @entity1358 , 25 chromophobe @entity1358 , and 25 @entity1637 . Pathologic features (presence or absence of PC, mean thickness, continuity, and invasion by @entity5 ) were analyzed. PC thickness was measured using an ocular micrometer to the nearest 1/10  mm. RESULTS: A complete PC was found in 77% of clear cell @entity5 , 74% of papillary, 28% of chromophobe, and 4% of @entity1637 . @entity5 PC was present but incomplete in 18% of clear cell, 18% of papillary, 44% of chromophobe, and 56% of @entity1637 . The PC was entirely absent in no clear cell @entity5 , 6% of papillary, 28% of chromophobe, and 40% of @entity1637 . Mean PC thickness and presence of invasion beyond the PC differed significantly by @entity5 subtype. @entity37694 possessed the thickest PC showing invasion through the capsule in 8% of @entity5 compared to 30% of @entity5 . Complete PC invasion was not seen in chromophobe @entity1358 or @entity8880 . @entity1637 and chromophobe @entity1358 characteristically exhibited an incomplete or absent PC. CONCLUSION: The characteristics of peritumoral PC vary predictably with histologic subtype of @entity703 . @entity37694 shows the most consistent PC, with a lower rate of invasion beyond it compared to papillary @entity1358 . Chromophobe and @entity1637 characteristically have an incomplete or absent PC.
