Hosting 728 files, 2951 images, and 4 contributors.

Random Case

Joseph Junewick, MD FACR
over 10 years ago
Enter A Workflow
Standard2   Academic2

Please choose a workflow. A standard workflow allows you to browse the repository with full case detail; the academic workflow allows you to browse the repository with limited case detail revealed. Double click on the images to launch image viewer.

ARSt Case Repository

Calcified Trochlea of the Superior Oblique Muscle

Case Detail

Anatomy: Neck-Face
Joseph Junewick, MD FACR
Diagnostic Category: Normal variant
Created: over 9 years ago
Updated: over 9 years ago
Modality/Study Types: CT
Adobe32 PDF Imagej32 ImageJA


22 year old involved in motor vehicle accident.

Case Images


Calcified Trochlea of the Superior Oblique Muscle


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.


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.


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.


Charles Luttenton, MD

Corporate Office: 616.363.7272, 3264 North Evergreen Drive, Grand Rapids, MI 49525

Spectrum Health Helen Devos Childrens Hospital GE HealthCare