A Benign Rectal Polyp With Osseous Metaplasia: A Pediatric Case Report and Literature Review.

Osseous metaplasia is rarely detected in benign and malignant lesions in the gastrointestinal tract, especially in the pediatric population under the age of six. Here, we report the case of a four-year-old boy with a history of constipation associated with painless bleeding per rectum for six months which was excised successfully. Microscopically, there was osseous metaplasia with no malignant changes. Further reporting is needed due to the limited cases of osseous metaplasia in colorectal polyps, with unknown mechanisms of pathogenesis and prognostic factors, specifically in the pediatric population.