Figure 1: Histomorphology A-I (Hematoxylin & Eosin): Low power magnification (a-c) of different cases showing a well demarcated tumor from the myometrium (Case 5) (a); a tumor with pseudoinfiltrative pattern (Case 4) (b); and a tumor with infiltration into smooth muscle bundles (Case 3) (c). Different architectural patterns and morphology of UTROSCT identified: Small tumor cells with scant cytoplasm arranged in sheets and nests (Case 3) (d), small oval cells in nests embedded in a myxoid matrix (Case 1) (e); Tumor cells in sheets in a hyalinized stroma (Case 5) (f); Epithelioid tumor cells in sheets and vague tubules (Case 2) (g); Tumor cells arranged in nests, hollow, and solid tubules (Case 6) (h), having moderate eosinophilic cytoplasm with eccentric nuclei (i) Immunohistochemistry (a-e): Tumor cells immunopositive for calretinin (a), cytokeratin (b), desmin (c), estrogen receptor (d) with a low MIB-1 labeling index (e)