tumor melanosis
Diffuse pigmentation of ocular tissues caused by melanin-producing tumor cells.
Full Definition
Tumor melanosis refers to the widespread deposition of melanin pigment in ocular tissues as a result of melanin production by malignant melanoma cells. This condition can affect various ocular structures including the episclera, conjunctiva, and cornea, creating a characteristic dark discoloration. Tumor melanosis is most commonly associated with advanced uveal or conjunctival melanoma and indicates extensive tumor burden. The pigmentation results from melanin release by tumor cells and can persist even after successful tumor treatment. This finding has both diagnostic and prognostic implications in ocular oncology.
Usage
Usage note: Indicates advanced disease; distinguish from benign ocular melanosis.
In Context
- "The patient developed tumor melanosis with diffuse episcleral pigmentation following uveal melanoma progression." — Clinical examination note
- "Tumor melanosis was evident as dark staining of the conjunctival vessels and episclera." — Ophthalmology report