The Kobe journal of medical sciences
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Atypical polypoid adenomyoma (APA) is a rare polypoid tumor of the uterus composed of atypical endometrial glands and smooth muscle cells. Concomitant development of endometrial adenocarcinoma in APA remains infrequent. We report a case of the coexistence of endometrioid adenocarcinoma in APA. ⋯ No residual malignant lesions were found. Awareness of the close association of APA with the development of endometrial cancer is warranted. A meticulous pathological evaluation of specimen of APA is necessary for the detection of the coexistence of endometrial cancer.