[Acute rectal bleeding from malignant stromal tumor].

Stromal tumors of the rectum are rare. The most common symptoms are rectal bleeding, pain, constipation and obstruction. A case report of a 61 years old female admitted with acute bleeding due to malignant stromal tumor of the rectum is described.

Splenectomy, chemically-induced mammary tumors and parathymic lymph nodes in rats: experimental and morphological studies.

The objective of this study was to examine whether splenectomy alters the tumorigenic response of rats to chemically-induced mammary tumors and to determine the role played by the parathymic lymph nodes (PTLN) in the antitumor immune response. Female rats were splenectomized and then exposed to 9,10-dimethyl-1,2-benz(a)anthracene (DMBA) to induce mammary tumors. Splenectomy decreased the rate of tumor appearance.