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Dural Angiomatosis - PHACES
Joseph Junewick, MD FACR
over 8 years ago
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Calcified Trochlea of the Superior Oblique Muscle

Case Detail

Anatomy: Neck-Face
Junewick
Joseph Junewick, MD FACR
Diagnostic Category: Normal variant
Created: over 6 years ago
Updated: over 6 years ago
Tags: NEURO
Modality/Study Types: CT
Activities:
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History

22 year old involved in motor vehicle accident.


Case Images


Diagnosis

Calcified Trochlea of the Superior Oblique Muscle

Findings

CT – Ring like calcifications in the superior-nasal quadrant of the right and left orbits; the right sided calcification is more laterally positioned compared to the left.

Discussion

The trochlear apparatus is a synovial lined cartilaginous structure which facilitates movement of the superior oblique muscle. Troclear calcification is a benign condition which may be secondary to inflammation, degenerative process or metabolic disease. Often, trochlear calcification is related to diabetes mellitus in patients less than 40 years of age. It is important to recognize these calcifications as distinct from foreign bodies. Asymmetry of the trochlear apparati may indicate dislocation and may be associated with visual disturbance.

Reference

Hart BL, Spar JA, Orrison WW. Calcification of the trochlear apparatus of the orbit: CT appearance and association with diabetes and age. AJR 1992; 159:1291-1294.

Contributor

Charles Luttenton, MD



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