The use of coronal sections in evaluating lesions of the sellar and parasellar regions.

Nine cases from a series of 12 are presented to illustrate the value of coronal sections in delineating the borders and origins of extraaxial sellar and parasellar masses. In this projection, the presence or absence of suprasellar extension is demonstrated, and two important signs are discussed. A rim of cisternal cerebrospinal fluid termed the "cap" is seen over the superior border of masses extending into the suprasellar region defining their extraaxial location. The broad base of a lesion will define its origin. The limitations of the method are also discussed.