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Atypical polypoid adenomyoma, abbreviated APA, is a rare uncommon benign tumour of the uterus.
Pathology
APAs are characterized by glands with abnormal shapes that: (1) often have squamous metaplasia, and (2) are surrounded by benign smooth muscle. Nuclear atypia, if present, is mild.
The microscopic differential diagnosis includes endometrial carcinoma and endocervical adenocarcinoma.
References
Atypical polypoid adenomyoma Wikipedia(Text) CC BY-SA