Localised peripheral primitive neuroectodermal tumour (PNET) of the conjunctiva.

A 16-year-old male presented with a 3-month history of an asymptomatic, enlarging conjunctival lesion. An excisional biopsy was performed and histologic and immunohistochemical examination showed characteristic features of a peripheral primitive neuroectodermal tumour (PNET) adjacent to a benign compound naevus. FISH analysis, demonstrating a split-signal at 22q12, confirmed the diagnosis. Staging investigations were negative confirming the primary nature of the lesion. The patient was treated with local wide re-excision and chemotherapy. He remains alive and well 29 months after initial resection.