Ocular naevus and melanoma in acromegaly.

Acromegaly favours the development of extrapituitary neoplasms presumably promoted through increased GH and IGF-I levels. We describe here two patients which acromegaly and benign and malignant melanocytic tumours of the eye choroid. The first patient had a 15 year history of progressive acromegaly despite trans-sphenoidal surgery, radiation and bromocriptine therapy when she presented with melanoma of the eye and a contralateral benign melanocytic tumour. The second patient was referred with typical acromegaly. The initial fundal examination revealed a right sided benign melanocytic tumour of the choroid. Subsequent follow up of the naevi has not shown any change in the tumours after one and three years respectively. The occurrence of melanoma has not been reported in acromegaly. Increased growth of benign naevi might be expected as GH and IGF-I receptors have been described on melanocytes. As naevi may degenerate into melanomas in normal subjects and radiation therapy could trigger their transformation, we suggest that prior to irradiation, acromegalic subjects should undergo a careful ocular examination in order to assess the presence of ocular naevi.