Ropinirole (SK and F 101468) in the treatment of Parkinson's disease.

do not persist for more than three weeks.4 Likewise, there was no evidence of haemosiderin deposition in the stalk which might be expected after haemorrhage. Stalk enlargement could have been an effect of untreated diabetes insipidus, in which the first case might have expected resolution of the abnormality with treatment. However, the swelling persisted for three months despite adequate treatment of the diabetes insipidus. It is possible that unrecognised injury or infection with ensuing inflammation resulted in the swelling observed initially. It is known that insults to the stalk can lead to reorganisa-tion and proximal enlargement.' We may have observed the resolution ofsuch changes. We conclude that pituitary stalk enlargement may occur in idiopathic cranial diabetes insipidus, persist for months, and eventually disappear. Serial imaging with CT or MRI will exclude progressive infiltrative or neoplastic causes. Transection of the pituitary stalk: Development ofan ectopic posterior lobe assessed with MR imaging. Ropinirole