Glucagonoma syndrome is a paraneoplastic syndrome in which the occurrence and resolution of the characteristic necrolytic migratory erythema lesions parallel the course of the underlying glucagonoma. Nail abnormalities and dyspareunia are rarely reported in this syndrome. We describe a case of glucagonoma syndrome in which recurrent brittle nails and dyspareunia gave the patient the first clues of the recurrence of glucagonoma. It is possible that the significance of onychoschizia and dyspareunia has been overlooked in glucagonoma syndrome because patients might not report these problems to their doctors. Our case illustrates the importance of examining the nail and genital mucosa in patients with glucagonoma syndrome and including this syndrome in the differential diagnosis of onychoschizia and dyspareunia.
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