Inflammatory cap polyp of the sigmoid colon: a case report
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Inflammatory cap polyp is a very rare benign entity of the distal left colon, characterized by inflammatory polyp with a “cap” of fibrinopurulent exudates. They are usually multiple and commonly present with bleeding per rectum or mucoid discharge. Solitary polyp presenting with intermittent intussusceptions is rare.

Authors report the case of a 45-year-old Nepalese male with a solitary inflammatory sigmoid colon polyp. The patient presented with a 1-month history of rectal bleeding, mucoid discharge, and severe colicky abdominal pain due to intussusceptions. On colonoscopy, there was an exophytic mass with surface exudates. Colonic resection and anastomosis were performed, due to recurring partial intestinal obstruction. At a 6-month follow-up, the patient was asymptomatic.

Conclusively, inflammatory cap polyp is a benign entity, and it should be kept in mind as an important differential diagnosis of exophytic colonic mass with surface exudates.

Source: https://jmedicalcasereports.biomedcentral.com/articles/10.1186/s13256-021-02857-8
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