Rare malignant tumors of the rectum:  lymphosarcoma and melanoma.
D006801:Humans; D008223:Lymphoma; D008228:Lymphoma, Non-Hodgkin; D008499:Medical Records; D008545:Melanoma; D012004:Rectal Neoplasms; D012007:Rectum
LYMPHOSARCOMA; MELANOMA/case reports; RECTUM/neoplasms