Traumatic Exotropia Following Partial Laceration of Medial Rectus Muscle.

You, Yong Sung; Kim, Hee Sun; Yoo, Tae Hwan; Lee, Jong Bok

Original Article

Journal of the Korean Ophthalmological Society 1997;38(10):1875-1878.
Published online October 1, 1997.

Traumatic Exotropia Following Partial Laceration of Medial Rectus Muscle.

Yong Sung You, Hee Sun Kim, Tae Hwan Yoo, Jong Bok Lee

¹Institute of Vision Research, Yonsei University College of Medicine, Seoul, Korea.
²Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea.

내직근의 부분 열상에 의해 발생한 외사시 1예

유용성(Yong Sung You),김희선(Hee Sun Kim),유태환(tae Hwan Yoo),이종복(Jong Bok Lee)

Abstract

Direct trauma to extraocular muscles is usually the result of penetrating injuries. Contusion, avulsion, or laceration of the extraocular muscles may occur. We have treated a 3-year-old boy with what appeared to be nasal conjunctival laceration by scissors. The injured eye showed approximately 50 prism diopter exotropia and slight limitation of adduction of the left eye. In orbital MRI focal hemorrhage and adhesion around left medial rectus muscle was noted but the discontinuity of left medial rectus muscle was not found in orbital MRI. After 6 months, the child underwent strabismus surgery under general anesthesia. We detected that the upper portion of the left medial rectus muscle was lacerated about 25% of total width of muscle from the insertion to 4mm distal to the insertion. We performed a recession-resection procedure to the left eye. 3 month after the operation, duction movement showed no limitation. The prism and cover test at near revealed orthophoria. We suggest that a strabismus following after a periocular laceration can be accompanied with a injury of extraocular muscle.

Key Words: Direct trauma;Extraoclar muscles;Exotropia