PMC5356202_01
Colonoscopy showing a large mass partially occluding the lumen of the rectosigmoid colon.
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F1
A 58-year-old woman with a history of chronic diarrhea and post-menopausal uterine bleeding underwent a routine colonoscopy for colon cancer screening, which demonstrated a large, nearly obstructing mass extending from the proximal rectum into the distal sigmoid colon (Figure 1).
A rectosigmoid colon mass (13.0 x 7.0 x 4.0 cm) showing polypoid endometriosis of the colonic mucosa.
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F2
The pathology specimen revealed a 13 x 7 x 4-cm mass involving the colonic mucosa (Figure 2).
(A) Cystically dilated glands scattered beneath the colonic mucosa with focal crowding. (B) High-power view revealing benign-appearing endometrioid glands and stroma without atypia.
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F3
Pathologic findings of surgical specimens showed endometrioid glands and stroma without atypia and foci of simple hyperplasia and mucinous metaplasia, consistent with a diagnosis of polypoid endometriosis without malignant transformation (Figure 3).