Leiomyoma of the Sigmoid Colon Causing Sigmo-Sigmoid Intussusception: A Case Report

Colonic Leiomyomas are rare benign tumors and constitute 3% of all the GI Leiomyomas and constitute 1% of all GI neoplasms. They are the second most common mesenchymal polyp found in the colon. They are most commonly found in the distal colon and rectum. The classic histologic appearance of colonic leiomyomas are well-circumscribed lesions that arise from the muscularis mucosae and occupy the submucosa. These tumors are usually benign and asymptomatic and if symptomatic they present with abdominal pain, intestinal obstruction, perforation or hemorrhage. Appropriate management of Subepithelial lesions involves making a correct diagnosis and estimating their malignant potential. We describe the case of 16-year-old female who presented with complaints of abdominal pain and passage of stools after every meal. After relevant investigations, i.e, CECT Abdomen-intusussception sigmo-sigmoid colon with mass was diagnosed. Sigmoid colon with mass was removed and sent for histopathology. Using histology and immunohistochemistry it was diagnosed as leiomyoma. This case highlights the limitations of diagnosing a mass/ polyp only on clinical and radiological findings and also proves that leiomyomas can have various presentations such as mass in colon, sessile or pedunculated colonic polyps.