title: Primary malignant melanoma of the orbit arising in a cellular blue naevus.
abstract: Primary malignant melanoma of the orbit is a rare clinical entity. We report the clinical course and present the light and electron microscopic findings in a case arising in a cellular blue naevus. While most orbital melanomas are associated with a naevus of Ota, there was no clinically visible abnormal pigmentation in our patient. The possible origin of the tumour cell and its ultrastructural features are discussed.
authors.affiliation: Department of Ophthalmology, Freiburg University, FRG.
authors.forename: K U
authors.initials: KU
authors.lastname: Löffler
authors.forename: H
authors.initials: H
authors.lastname: Witschel
mesh_terms: D000328:Adult; D006801:Humans; D008297:Male; D008545:Melanoma / Q000473:pathology* / Q000648:ultrastructure; D009378:Neoplasms, Multiple Primary / Q000473:pathology* / Q000648:ultrastructure; D009508:Nevus, Pigmented / Q000473:pathology* / Q000648:ultrastructure; D009918:Orbital Neoplasms / Q000473:pathology* / Q000648:ultrastructure