J Korean Ophthalmol Soc.
2006 May;47(5):852-857.
A Case of Congenital Absence of the Inferior Rectus Muscle
- Affiliations
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- 1Department of Ophthalmology, Hallym University, College of Medicine, Chunchun, Korea. ljy690725@hanmail.net
Abstract
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PURPOSE: To report a patient with isolated congenital absence of the right inferior rectus muscle. To our knowledge, this is the first case reported in Korea.
METHODS
A 6-year-old girl presented with an anomalous head posture of 15 degrees head tilt. She had 45delta right hypertropia, 15delta A-pattern exotropia and a marked underaction of the right inferior rectus. At the time of the surgery, forced duction test of the right eye showed no limitation and the inferior rectus muscle was found to be absent. Inferior transposition of the horizontal rectus muscles was more approximated to each other than that described in the classic Knapp operation. This was carried out while the right medial rectus muscle was simultaneously resected 2mm for correction of the exotropia.
RESULTS
There was significant improvement in infraduction at 6 months postoperative with only a residual 6delta exotropia in primary position.
CONCLUSIONS
Absence of the inferior rectus showed hypertropia with A pattern exotropia. It did not bring about contracture of the superior rectus muscle or amblyopia. The outcome of the modified Knapp procedure was satisfactory.
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