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Vascular plexus is a differentation criterion for muscularis mucosa from muscularis propria in small biopsies and transurethral resection materials of urinary bladder?

Abstract：

OBJECTIVE:Smooth muscle fibres are found within the superficial lamina propria of urinary bladder (Muscularis Mucosa). These muscle fibres of muscularis mucosa should be distinguished from the muscularis propria in cases with urothelial carcinoma, because the depth of infiltration affects prognosis and therapy modalities. The aim of the present study was to evaluate whether the presence of vascular plexus is a criterion for muscularis mucosa and to distinguish it from muscularis propria in urinary bladder biopsies and transurethral resection specimens. MATERIALS AND METHODS:Hematoxylin-Eosin and Masson-Trichrome stained slides of 54 cases with urothelial carcinoma were reviewed. RESULTS:In all cases (100%), thick walled vessels were observed within the lamina propria of urinary bladder. Smooth muscle layer of lamina propria was seen in 48 of 54 cases (88.8%), and these smooth muscle fibres were co-existed with thick walled vessels. In invasive urothelial carcinoma; thin smooth muscle fibres and thick walled vessels were seen within the lamina propria in 22 of 24 cases (91.7%). There were two cases (8.3%) including only vessels in small biopsies of invasive urothelial carcinoma cases. In cases with non-invasive urothelial carcinoma; muscle fibres of muscularis mucosa and vessels were found within the lamina propia in 26 of 30 cases (86.7%). In this group, muscle fibres were not detected in 4 cases (13.3%). CONCLUSION:Muscularis mucosa can be detected histologically in urinary bladder biopsies and TUR materials. We emphasize that the presence of vascular network is a useful criterion to determine muscularis mucosa of urinary bladder, even in the absence of muscle fibres.

journal_name

Int Urol Nephrol

journal_title

International urology and nephrology

authors

Aydin A,Uçak R,Karakök M,Güldür ME,Koçer NE

doi

10.1023/a:1024493518202

keywords:

subject

Has Abstract

pub_date

2002-01-01 00:00:00

pages

315-9

issue

3

eissn

0301-1623

issn

1573-2584

journal_volume

34

pub_type

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