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There is cerebellar tonsils displacement into the upper cervical canal through the foramen magnum, bilateral subdural fluid collections. Dural sinuses are enlarged and round-shaped. In addition, there is calvarium thickening and sphenoid sinus hyperpneumatisation. Enlargement of the central canal of the spinal cord (at C5-Th2 levels) with syrinx formation is also seen.
There is a Y-shaped ventriculoperitoneal and cysto-peritoneal shunt.
Features are consistent with chronic intracranial hypotension due to CSF overdrainage.