Sector (partial) oculo(dermal) melanocytosis in 89 eyes.

PURPOSE: To describe sector (partial) involvement of the uvea with melanocytosis.
DESIGN: Noninterventional, retrospective case series. PARTICIPANTS: A total of 89 eyes of 86 patients.
METHODS: Review of medical records, color photographs, and ultrasound images. MAIN OUTCOME MEASURES: Clinical features and relationship with uveal melanoma.
RESULTS: Approximately all patients were Caucasian (n = 83, 97%), and sector melanocytosis involved the right (n = 41, 46%) or left (n = 48, 54%) eye. The involved tissue included iris (n = 58, 65%), choroid (n = 48, 54%), and both iris and choroid (n = 17, 19%). The melanocytosis affected a mean of 6 clock hours of iris and 5 clock hours of choroid. Related melanocytosis involved the sclera (n = 39, 44%), eyelid (n = 4, 4%), temple (n = 4, 4%), scalp (n = 1, 1%), and palate (n = 1, 1%). Uveal melanoma was found at presentation in 7 patients (8%) and was multifocal in 2 of these patients. A comparison of eyes with versus without melanoma revealed clinically significant factors (odds ratio [OR] > 2) of male gender (71% vs. 43% [OR 3.36]); cutaneous/palate melanocytosis (14% vs. 7% [OR 2.11]); scleral melanocytosis heaviest in superior, temporal, or nasal quadrants (57% vs. 29% [OR 2.41, confidence interval, 2.24-3.92]); and any degree of choroidal melanocytosis (86% vs. 70% [OR 2.63]), particularly diffuse choroidal melanocytosis (29% vs. 16% [OR 3.85]). None of these factors reached statistical significance in this small cohort. Over a mean follow-up of 6 years, there was no metastatic event.
CONCLUSIONS: Ocular melanocytosis can be sectoral (partial), affecting only a mean of 5 to 6 clock hours of the uvea and can manifest melanoma within the melanocytosis region. There were no specific features of melanocytosis statistically related to the presence of melanoma. FINANCIAL DISCLOSURE(S): The author(s) have no proprietary or commercial interest in any materials discussed in this article.