Pseudosarcomatous Proliferation of Cx43- and Kit-Expressing Interstitial Cell in the Urinary Bladder
Figure 2
(a) Irregular spindle-to-oval-shaped cells were loosely arranged under the urothelial epithelium (transurethral resection (TUR) specimens). Note the myxoid stroma with a few inflammatory cells. (b) The shape of the mass obtained by partial cystectomy. The upper region of the mass was already resected by TUR. The dome-shaped mass extended from the lamina propria to the deep muscular layer. (c) The mass exhibited a loose and compact arrangement. (d) Spindle-shaped myofibroblastic cells were loosely arranged in the myxoid stroma. Asterisk indicates the mitotic figure. (e) Relatively compact fascicular arrangements of the spindle cells were found in the deep region of the mass. (f) Spindle-to-round-shaped cells invaded the muscle layer. (g) Eosinophil infiltration in the deep region of the mass. (h) and (i) Silver reticulum stain demonstrates reticulin fibers wrapped around individual spindle cells and emphasizes a fascicular growth pattern.
