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[20 MHz ultrasound diagnosis in chronic canaliculitis]
1Klinik und Poliklinik für Augenheilkunde, Ernst-Moritz-Arndt Universität Greifswald. Tost@mail.uni-greifswald.de
Background:
High frequency sonography is used with a medium frequency of 50 to 100 MHz for non-invasive examination of the anterior eye segment. 20-MHz probes are considered to be a cost-efficient alternative, with a lower resolution and a higher penetration depth. We examined the value of the 20-MHz probe in diagnosing chronic canaliculitis.
Case Report:
A 50-year-old woman was evaluated for a chronic canaliculitis. A pathognomonic sign of the chronic canaliculitis was the detection of concrements by high-resolution ultrasound. Grains measuring 1-2 mm in diameter could be shown in an ecstatic canaliculus with 20-MHz sonography. The high-resolution sonography showed the extent of the ectasia of the canaliculus and was therefore useful in planing the operative strategy.
Conclusion:
The spectrum of possibilities in diagnosing chronic canaliculitis is broadened with this diagnostic tool. Specially when characteristic symptoms are missing, the 20-MHz probe may be useful in diagnosing patients with chronic canaliculitis.