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Age: 42

Sex: Male

Indication: Trauma

Trochlear Calcification

Mimicking a Foreign Body



Findings Relating to the Mimic

  • Mild right preseptal soft tissue stranding
  • Curvilinear calcification in the upper inner post-septal soft tissues bilaterally corresponds to the trochlea, a normal physiologic/developmental variant.


Discussion

  • The superior oblique muscle passes through the trochlea, which is a pulley-like structure that is adjacent to the medial wall of the orbit.
  • Calcification of the trochlea is a common incidental variant and can be unilateral or bilateral.


Images

7 = Trochlea. 6 = Superior oblique muscle. Illustration by Edelhart Kempeneers/ Public domain via Wikimedia (https://commons.wikimedia.org/wiki/File:Eyemuscles.png) Left trochlear calcification (red arrow)

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