Abstract
The lifetime risk of developing melanoma in Caucasian patients with large congenital melanocytic nevi (LCMN) is estimated to be between 4.5% and 10%. Cohort studies of LCMN and the risk of melanoma development in an Asian population are not available. We sought to determine the risk of melanoma development in a retrospective cohort of patients presenting with LCMN to a dermatology tertiary referral center in Singapore from January 1989 to December 2004. Patients with congenital melanocytic nevi (CMN) that covered at least 5% of the body surface area were included in the study. Data were obtained from electronic records and photographic documentation. A search for malignancy was done using the National Cancer Registry database. In all, 39 patients (23 male and 16 female) met the study criteria of LCMN; 15 of 39 patients also met the criteria of having a giant CMN (ie, a CMN that is predicted to be at least 20-cm diameter in adulthood). There were 29 Chinese, 6 Malay, 1 Indian, and 3 Caucasian patients. Their ages ranged from 23 months to 60 years (mean 18.8 years). They presented at a mean age of 26 months and were followed up for an average of 16.9 years. The size of the LCMN ranged from 5% to 40% of body surface area, with a m...Continue Reading
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