Retrorectal hemangioendothelioma.
D006390:Hemangioendothelioma; D006801:Humans; D009369:Neoplasms; D012004:Rectal Neoplasms; D012007:Rectum; D012445:Sacrococcygeal Region
HEMANGIOENDOTHELIOMA; RECTUM/neoplasms; SACROCOCCYGEAL REGION/neoplasms