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Juvenile polyps are distinct hamartomatous malformations of the gastrointestinal tract that may occur in the heritable juvenile polyposis syndrome (JPS) or sporadically. Histologically, juvenile polyps are characterized by a marked increase of the stromal cell compartment, but an epithelial phenotype has also been reported. JPS has an increased risk of colorectal cancer but sporadic juvenile polyps do not. In 50% to 60% of patients with JPS, a germline mutation of the transforming growth factor-β/bone morphogenetic protein (BMP) pathway genes SMAD4 or BMPR1A is found. This study compares the histologic phenotype of juvenile polyps with a SMAD4 or BMPR1A germline mutation and sporadic juvenile polyps.

Histologic Variations in Juvenile Polyp Phenotype Correlate With Genetic Defect Underlying Juvenile Polyposis