Loading Stack -
0 images remaining
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.
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.
- 1. Kan P, Stevens EA, Couldwell WT. Incidental giant arachnoid granulation. AJNR Am J Neuroradiol. 2006;27 (7): 1491-2. Pubmed citation