Abstract
Megacolon is an abnormal dilatation of the colon caused by non-mechanical obstruction. The dilatation is often accompanied by a paralysis of the peristaltic movements of the bowel resulting in chronic constipation. A megacolon can be either acute or chronic. It can also be classified according to etiology. We present imaging features of a 76-year-old female with idiopathic rectosigmoid megacolon. In this unusual case massive rectosigmoid dilatation (maximum 18 cm transverse diameter) and anterior abdominal wall bulging was mimicking a giant palpable abdominal mass.
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