MRI in the diagnosis of so-called pituitary apoplexy: seven cases.

The authors describe seven cases of pituitary adenoma with acute neurological symptoms (the so-called pituitary apoplexy), which were examined by magnetic resonance imaging (MRI). Four patients underwent surgery and the diagnosis of pituitary adenoma was histologically confirmed. In 3 patients, conservative treatment was decided and serial MRI examinations showed progressive decrease in size of the tumour, leading in one case to an empty sella. Computerized tomography (CT) was positive in all 7 cases, but less contributive than T1-weighted MRI images both for tumoral volume determination and detection of intratumoral haemorrhage. Although theoretical problems may arise concerning the diagnosis of acute intratumoral bleeding at an early stage, the authors emphasize the value of MRI in showing the extension of the tumor into the retroclival cistern and the cavernous sinus, especially when surgery is not performed in the acute period.