What is muscularis propria of the bladder?
The bladder, like other parts of the urinary tract, is lined with a layer of cells called the urothelium. This layer of cells is separated from the bladder wall muscles, called the muscularis propria, by a thin, fibrous band called the lamina propria.
What is papillary bladder cancer?
Papillary tumors are thin, finger-like growths that start in the bladder lining and extend into the center of the bladder. Sometimes, these cancers stay in the bladder without growing or spreading. But more aggressive types of this cancer can spread to other organs.
What is high-grade urothelial carcinoma?
High-grade tumors have an aggressive appearance under a microscope and are assumed invasive in the kidney or ureter. In the bladder, a thick bladder muscle (called the detrusor) acts as a barrier to confine invasive cancers but in the kidney and ureter, this muscle does not exist.
What is the function of muscularis propria?
Muscularis propria (externa): smooth muscle layer. These layers of smooth muscle are used for peristalsis (rhythmic waves of contraction), to move food down through the gut.
Is muscularis propria detrusor muscle?
Muscularis propria (Detrusor muscle) consists of thick bundles of smooth muscle in contrast to wispy fascicles of muscularis mucosae. This distinction may be difficult in small biopsies. The thickness and the pattern of muscularis propria varies in different parts of the bladder.
What is lamina propria invasion?
Invasion of the tumor stalk was defined as stage T1a, invasion of the lamina propria proper superficial to the level of muscularis mucosa as stage T1b and into or deeper than the muscularis mucosa as stage T1c.
Are papillary bladder tumors invasive?
Papillary carcinomas grow in slender, finger-like projections from the inner surface of the bladder toward the hollow center. Papillary tumors often grow toward the center of the bladder without growing into the deeper bladder layers. These tumors are called non-invasive papillary cancers.
How aggressive is urothelial carcinoma?
Muscle-invasive urothelial carcinomas are highly aggressive compared to cancers of the upper urinary tract, carrying a five-year disease-specific survival rate of <50% in pT2/pT3 disease, and this survival rate drops below 10% in pT4 cancer.
Can high-grade urothelial carcinoma be cured?
High-grade T1 (T1HG) bladder cancer (BCa) has a very high likelihood of disease recurrence and progression to muscle invasion. Radical cystectomy is considered the best chance at cure, albeit with a high risk of morbidity, and is overtreatment for some patients.
What is the difference between muscularis mucosa and muscularis propria?
The mucosa surrounds the lumen of the GI tract and consists of an epithelial cell layer supported by a thin layer of connective tissue known as the lamina propria. The muscularis mucosa is a thin layer of smooth muscle that supports the mucosa and provides it with the ability to move and fold.
What cells are in the muscularis propria?
It is composed of elastic fibers and 3–10 smooth muscle cells, generally arranged in an outer longitudinal and inner circular layer. Smooth muscle cells may radiate from the muscularis mucosa into the lamina propria and extend in the villi.
What is the muscularis propria made of?
smooth muscle cells
It is composed of elastic fibers and 3–10 smooth muscle cells, generally arranged in an outer longitudinal and inner circular layer. Smooth muscle cells may radiate from the muscularis mucosa into the lamina propria and extend in the villi.
What is the diagnostic utility of Smoothelin antibody in urothelial cancer?
“Diagnostic utility of antibody to smoothelin in the distinction of muscularis propria from muscularis mucosae of the urinary bladder: a potential ancillary tool in the pathologic staging of invasive urothelial carcinoma.”. Am J Surg Pathol 33 (1): 91-8. doi: 10.1097/PAS.0b013e3181804727.
Is the muscularis propria obliterated in urothelial carcinoma?
Comment: The tumour is seen around bundles of smooth muscle that are favoured to represent muscularis mucosa; however, obliterated muscularis propria cannot be excluded. Correlation with the clinical findings is required. Additional transurethral sampling and/or imaging to assess the muscularis propria is suggested. Urothelial carcinoma.
What is discontinous muscularis mucuosae (mm)?
A thin layer of discontinous muscularis mucuosae (MM) is present and, especially if hypertrophic, may be confused with muscuaris propria (MP). Staging of bladder cancer is dealt with in the bladder cancer staging article.
What are the characteristics of muscularis propria invasion?
To call muscularis propria invasion: Definite tumour must be between muscle. Muscle bundles must be thick. Multiple bundles must be adjacent to one another. Should not be superficial – surface epithelium if present should be distant. Invasion of hypertrophic muscularis mucosae. Muscularis propria – usu. strong.
