Proctosigmoiditis is a form of ulcerative colitis that affects the rectum and sigmoid colon (the S-shaped last part of the large intestine).
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Age at time of diagnosis of ulcerative colitis presenting as
Mommy, the toilet's red!! James Markowitz, MD Division of Pediatric Gastroenterology Cohen Children's Medical Center of NY New Hyde Park, NY. - ppt download
What is Ulcerative Colitis?