Inflammatory cap polyp of the sigmoid colon: a case report

Narendra Pandit,Tek Narayan Yadav,Mona Dahal,Laligen Awale,Shailesh Adhikary

doi:10.1186/s13256-021-02857-8

Narendra Pandit, Tek Narayan Yadav + Show 3 more

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https://doi.org/10.1186/s13256-021-02857-8

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Abstract

BackgroundInflammatory 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.Case presentationWe 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.ConclusionInflammatory 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.

Highlights

IntroductionInflammatory cap polyp is a rare, benign entity of the colon characterized by an inflammatory polyp with a “cap” of fibrinopurulent exudates [1]
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
Inflammatory cap polyp is a rare, benign entity of the colon characterized by an inflammatory polyp with a “cap” of fibrinopurulent exudates [1]

Summary

Introduction

Inflammatory cap polyp is a rare, benign entity of the colon characterized by an inflammatory polyp with a “cap” of fibrinopurulent exudates [1]. Its etiopathogenesis and the best treatment modality are poorly described because of the unfamiliarity and its rarity They are usually multiple but can be solitary and confined to the left distal colon [3, 4]. We describe an interesting case of a solitary inflammatory cap polyp, which preoperatively mimicked malignancy and required colonic resection for intussusceptions caused by the lesion. The pain was located in the left iliac fossa, intermittent, colicky, and at times requiring injectable analgesics for relief. He complained of the passage of large amounts of mucopurulent discharge, per rectum. Histopathological examination of the lesion showed polypoid tissue revealing surface ulceration, capped by fibrinous exudates.

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