Rare diseases · Sign or symptom

Hamartomatous polyposis

HP:0004390

What it means

Polyp-like protrusions which are histologically hamartomas. These can occur throughout the gastrointestinal tract. Hamartomatous polyps are composed of the normal cellular elements of the gastrointestinal tract, but have a markedly distorted architecture.

Patients with Cowden-Syndrom for example often have multiple hamartomatous gastrointestinal polyps.

Rare diseases that can present with this6

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category

Also called: Gastrointestinal hamartoma · Gastrointestinal hamartomatous polyps · Hamartomatous polyps

Hamartomatous polyposis

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This page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.