Primary Squamous Cell Carcinoma of the Urinary Bladder Presenting as Peritoneal Carcinomatosis

Figure 2

Panel (a) shows an area of invasive, keratinizing squamous cell carcinoma that has infiltrated beyond the muscularis propria (detrusor muscle) and into the perivesical adipose tissue. There is an associated desmoplastic reaction to the tumor. Panel (b) demonstrates the extensive squamous metaplasia seen in the background benign urothelium. Adjacent to the invasive tumor were foci of squamous cell carcinoma in situ (Panel (c)). Original magnification—200× (panel (a)), 400× (panels (b), and (c)).

(a)

(b)

(c)