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Age: 79

Sex: Female

Indication: Adenoid Cystic Carcinoma

Inferior Oblique Muscle

Mimicking a Mass

Findings Relating to the Mimic

  • No orbital mass.  Rounded appearance of the left inferior oblique muscle near it’s insertion on the inferolateral left globe.


  • Occassionally the inferior oblique can look mass-like near its insertion on the inferolateral aspect of the globe. Using thins and reformats and tracing the muscle to it’s origin along the orbital aspect of the maxilla can help clarify.


The inferior oblique appears mass-like near it's insertion on the inferolateral globe (red arrow) The inferolateral oblique muscle originates from the orbital surface of the maxilla and inserts on the inferolateral globe (white arrows). Illustration by Patrick J. Lynch, medical illustrator / CC BY (https://creativecommons.org/licenses/by/2.5) via WikiMedia (https://commons.wikimedia.org/wiki/File:Eye_orbit_anterior.jpg)

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