[Increased T1 signal of the residual normal anterior pituitary gland following medical treatment of pituitary prolactinoma].

Purpose: To illustrate that residual normal pituitary gland may show hyperintense signal on T1-weighted image after medical treatment of pituitary prolactinoma.

Material: and methods. Three patients treated with bromocriptine for a prolactinoma and showing hyperintense signal of the residual normal pituitary tissue on T1-weighted images were studied.

[Gas-containing gallstones: value of the "Mercedes-Benz" sign at CT examination].

Gas-containing gallstones are well-known in vitro. The typical triradiate arrangement of fissures filled with gas, first described on abdominal plain films, was named by Meyers the "Mercedes-Benz" sign. This sign is absent of the recent literature.

Dural enhancement in pituitary macroadenomas.

We describe the normal dural enhancement patterns of the sellar region and determine whether the duramater is affected by pituitary macroadenomas. Dural enhancement appeared to be usually abnormal in 20 patients with pituitary macroadenoma compared with 20 control patients, mainly at the planum sphenoidale and carotid sulcus. However dural changes are subtle and their recognition requires knowledge of the normal enhancement patterns.