Twenty-one patients with epiphora were examined by conventional dacryo
cystography, using Lipiodol as a contrast medium, and CT dacryocystogr
aphy, using a water soluble contrast medium. In the latter, the materi
al was not introduced under pressure but three or four drops were admi
nistered, providing a physiological method of investigation. Subsequen
tly, CT dacryocystography provides functional information about lacrim
al disorders and is easy to use.