Congenital Bilateral Hypoplasia of Medial Rectus Muscle: A Case Report and Its Management

Purpose: To describe the clinical findings, preoperative radiologic findings and results of surgery in a patient with congenital bilateral hypoplasia of medial rectus muscle Case report: A 50-year-old man presented with large angle incomitant horizontal deviation with marked deficit of adduction of both eyes. MRI finding defined very thin medial rectus muscle. Intraoperatively medial rectus muscles were not found. Lateral rectus recess combined with partial vertical rectus muscle tendon transposition was carried out on both eyes. The patient had orthotropia in primary position and adduction improved in final follow-up. Conclusion: This case is the first case report of the Iranian population who had congenital hypoplasia of medial rectus muscle. MRI allowed effective surgical planning to correct congenital abnormality.