Arachnoid granulation

Case contributed by Dr Lawrence Josey

Patient Data

Age: 70
Gender: Male
CT

Well demarcated lesion with sclerotic margins within the diploic space adjacent to the sagittal sinus. No skull fracture or recent trauma. Mean HU density is 6.0. 

Case Discussion

Arachnoid granulation (also known as a Pacchionian granulation) most frequently occurs in a parasagittal location and can cause an osteolytic, sharply circumscribed lucency on a skull x-rays, or a filling defect in dural venous sinuses, which can be mistaken for dural venous thrombosis. They increase in size with age and are seen in approximately two-thirds of patients.

With thanks to Dr Duncan Snodgrass for case submission. 

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Case information

rID: 34093
Case created: 4th Feb 2015
Last edited: 18th Dec 2015
Inclusion in quiz mode: Excluded

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