Rare diseases · Sign or symptom

Focal T2 hyperintense thalamic lesion

HP:0012692

What it means

A lighter than expected T2 signal on magnetic resonance imaging (MRI) of the thalamus. This term refers to a localized hyperintensity affecting a particular region of the thalamus.

The term "unidentified bright object" has been used to describe T2 hyperintense lesions in the thalamus and elsewhere in patients with neurofibromatosis.

Rare diseases that can present with this2

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

Focal T2 hyperintense thalamic lesion

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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.