A woman in her seventies presented with mucous hematochezia. Colonoscopy revealed a poorly differentiated adenocarcinoma in the upper rectum. Immunohistochemical staining showed CK7 positivity and CK20/CDX2 negativity, findings atypical for …
Adenomyosis and endometriosis are estrogen-driven disorders with a recognized potential for malignant transformation, particularly through atypical endometriosis. The molecular and immune mechanisms underlying this progression remain incompletely understood. However, clinical …
Primary presacral clear cell carcinoma (CCC) of Müllerian origin is extremely rare. Malignant transformation of endometriosis is a known phenomenon, though typically involving the ovaries or pelvic peritoneum. Retroperitoneal presentation, …