Patient Data
Age: 70 years
Gender: Male
From the case:
Arachnoid granulation
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A well-demarcated lesion with sclerotic margins within the diploic space adjacent to the sagittal sinus. No skull fracture or recent trauma. The 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.
Venous lakes can have a similar appearance to this case and thus the measured CSF-like density is useful.
With thanks to Dr Duncan Snodgrass for case submission.
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