Calcified trochlear apparatus

Case contributed by Dr Bruno Di Muzio

Presentation

Patient to be submitted to a cervical spine MRI due a later evaluation related to trauma. On MRI safety check list he refers a previous history of ocular implant. MRI technician came to discuss the case. Previous brain CT available on the PACS.

Patient Data

Age: 58
Gender: Male

CT Brain

CT

CT images show bilateral small focus of calcification located adjacent to the medial orbital wall corresponding to a trochlear apparatus calcification.  

Annotated image

CT images show bilateral small focus of calcification located adjacent to the medial orbital wall corresponding to a trochlear apparatus calcification.  

Case Discussion

The trochlear apparatus of the eye is a cartilaginous structure with a synovium-lined sheath permitting unimpeded movement of the superior oblique muscle. Calcification in this location has an unclear cause, but is a benign condition. It is a common condition in patients more than 50 years old. 

The discrimination between intra-orbital calcification and foreign bodies may be important for patients, like in this case, who will be examined with MR imaging. 

 

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