Rare diseases · Sign or symptom
Pituitary null cell adenoma
HP:0011761
What it means
A type of pituitary adenoma that is of unknown cellular origin and that lacks immunocytochemical or fine structural markers. Null cell adenomas are not associated with hormone excess.
Rare diseases that can present with this5
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: Clinically silent pituitary adenoma · Hormonally silent pituitary adenoma · Non-functional pituitary adenoma · Silent pituitary adenoma
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Start free with EleplanThis 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.