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Natural history of presumed congenital Brown syndrome
T J Kaban1, K Smith, R B Orton
1Department of Ophthalmology, Ivey Institute of Ophthalmology, University of Western Ontario, London.
Objective:
To evaluate the stability of the ocular alignment in patients with presumed congenital Brown syndrome.
Design:
A retrospective review of patients with Brown syndrome with an emphasis on nonsurgical cases. Follow-up of at least 1 year was required for inclusion in the study.
Setting:
Patients were selected for this study from the pediatric ophthalmology services at the Ivey Institute of Ophthalmology, London, Ontario, and the Children's Hospital of Eastern Ontario, Ottawa.
Patients:
A cohort of 71 patients with presumed congenital Brown syndrome. Two cases were bilateral. Eleven cases were excluded because of insufficient length of follow-up, leaving 60 patients with an average follow-up of 46 months. All patients were assessed and followed up by a pediatric ophthalmologist.
Results:
Of 38 patients who had no hypotropia in primary position at presentation, only two (5%) patients experienced a worsening with the development of a small vertical strabismus during the follow-up period. Six (10%) of the entire group of 60 patients experienced a complete spontaneous resolution of the deficiency in elevation at 4, 6, 8, 10, 12, and 15 years of age.
Conclusion:
Among patients with congenital Brown syndrome, those who are orthotropic in the primary position tend to remain stable or improve over time without surgical intervention.