ABSTRACT
This article reviews several miscellaneous tumors of the rectum. Carcinoid tumors
of the rectum are uncommon tumors arising from cells of the gastrointestinal neuroendocrine
system with a wide range of biologic activity. Evaluation of these tumors includes
endoscopy, endoscopic ultrasound, magnetic resonance imaging, computed tomography,
scintigraphy, and a variety of histologic techniques. Treatment is based on the risk
of lymph node and distant metastases. Hemangiopericytomas are rare vascular tumors,
which may arise from the pelvis or retroperitoneum. Their evaluation and treatment
are discussed. Leukemic infiltration of the colon and rectum is well described in
autopsy studies and is being identified with greater frequency endoscopically. Treatment
is aimed at the underlying disease process, although radiation has been used in some
cases.
KEYWORD
Carcinoid tumors - hemangiopericytoma - leukemic infiltrates