A 68-year-old woman was admitted to our hospital because of bloody stool and submucosal tumor of the rectum. Colonoscopic examination and barium enema revealed hemisphere-like protruded submucosal tumor 5.6 cm in diameter in the lower rectum. Endoscopic ultrasonography shows that the lesion was low echoic mass and extraluminal proturuded, that finding was suggested a1 to a2 invasion. Histological findings of the biopsied specimens showed that it was a non-Hodgkin's, diffuse, small to medium sized cell, B-cell type of malignant lymphoma and that origened to mucosa-associated lymphoid tissue type (MALT) lymphoma.
After four courses by CHOP therapy, the bloody stool had disappeared, and colonoscopic examination revealed that submucosal tumor comprised of malignant lymphoma had disappeared. The patient has had no recurrence of the disease during 7 months since the last chemotherapy.
