Intraosseous arachnoid granulations

Case contributed by Elsayed Mohamed Elsayed Galbat
Diagnosis almost certain

Presentation

Non-Hodgkins lymphoma with CNS involvement subjected to bone marrow transplantation

Patient Data

Age: 60 years old
Gender: Male
This study is a stack
Axial CT with
contrast
This study is a stack
Axial bone
window
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Info

Occipital bone lytic areas are noted likely representing intraosseous arachnoid granulation

This study is a stack
Axial
FLAIR
This study is a stack
Axial
T2
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Info

The described areas at the occipital bone in CT followed CSF signal intensity on MRI sequences. 

Case Discussion

Prominent arachnoid granulations are an anatomical variant that could be mistaken as skull pathology.

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