Aberrant arachnoid granulations

Case contributed by Dr Ammar Haouimi

Presentation

Chronic headaches.

Patient Data

Age: 60 years
Gender: Female

There are numerous small well-defined lytic areas within the calvarium at the occipital region, adjacent to the lateral, and straight sinuses of CSF signal intensity on all sequences.

Case Discussion

MRI features of well-defined occipital lesions of CSF signal intensity protruding into the adjacent calvarium most consistent of aberrant arachnoid granulations. These are a common incidental finding. 

Additional contributor: A. Ramdani, MD.

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