Prolactinoma presenting with intermittent third nerve palsy.

A patient presented with a painful third nerve palsy. This resolved spontaneously, but recurred several months later. At his second presentation carotid angiography gave normal results, but a high resolution CT scan showed a tumour in the right parasellar region. The serum prolactin was raised at over 22,000 millimicrons/, showing this to be a prolactinoma.