CT sialography, Part I: Introduction, technique, anatomy, and variants.

The value of sialography in the investigation of parotid disease has been controversial and limited in its scope. The marked advantage of CT's ability to demonstrate soft tissue detail has been noted. However, parotid parenchyma is inadequately displayed in the unenhanced or intravenously enhanced state. Further information about pathology is available if the CT study is performed utilizing a sialographic contrast medium. Our method of performing such studies is demonstrated. Detail of parotid parenchyma available by this modality is noted. Illustrations of normal anatomy and variants that may be mistaken for mass lesions are presented.