Lacrimal ultrasonography.

Lacrimal ultrasonography (echography) evaluates lesions in that drainage system in a painless, noninvasive way in the office. The technique complements other imaging methods and can be correlated with histological results. The authors survey the principles and technique and describe the normal ultrasound, indications, applications, and limitations. Lacrimal ultrasound, whose potential has just lately been recognized, only reveals gross anatomic abnormalities and cannot evaluate the functional integrity of the lacrimal excretory system.