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[Morphological characteristics of chronic colitis in workers of gas-processing industry].

Surgical and biopsy material from 76 patients who had been working for a long time at Orenburg gas-processing factory was investigated. Group 1 consisted of 36 workers with classic lymphocytic colitis. Group 2 (40 men) had diarrhea with blood, pains in the abdomen, loss of weight, ulcers at colonoscopy, atypical variants of lymphocytic colitis at colonoscopy. These variants may result in the ulceration leading to inevitable surgery.