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Elevation deficit caused by accessory extraocular muscle

C Valmaggia1, W Zaunbauer, I Gottlob

  • 1Department of Strabismus and Neuroophthalmology, Kantonsspital St. Gallen, Switzerland.

American Journal of Ophthalmology
|April 1, 1996
PubMed
Summary
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A rare accessory extraocular muscle caused an elevation deficit in a 6-year-old boy. This supernumerary muscle, detected via advanced imaging, may be an atavistic retractor bulbi.

Area of Science:

  • Ophthalmology
  • Pediatric Ophthalmology
  • Anatomy

Background:

  • Extraocular muscles are crucial for eye movement and positioning.
  • Congenital anomalies of extraocular muscles are rare but can cause significant visual impairment.
  • Accurate diagnosis requires advanced imaging techniques.

Observation:

  • A 6-year-old boy presented with an elevation deficit in his left eye.
  • Computed tomography (CT) and magnetic resonance imaging (MRI) were performed.
  • Imaging revealed a unique, well-defined structure in the retrobulbar space.

Findings:

  • A supernumerary, fusiform, intraconal muscle was identified.
  • This anomalous muscle was located between the annulus of Zinn and the posterior globe.

Related Experiment Videos

  • The structure was confirmed as an accessory extraocular muscle.

    • Implications:

    • This finding represents a rare anatomical variation.
    • The anomaly may be an atavistic retractor bulbi muscle, a structure present in some non-primate mammals.
    • Understanding such anomalies is vital for diagnosing and managing pediatric strabismus and motility disorders.