False pituitary tumor in CSF leaks

The authors describe five patients with typical clinical and MRI features o f CSF leak and large enhancing pituitaries. The source of CSF leak was iden tified and surgically repaired in three patients. This was followed by disa ppearance of clinical symptoms and resolution of MRI abnormalities, includi ng the pituitary enlargement. Enhancing enlargement of pituitary is another head MRI abnormality in CSF leaks, likely reflecting a secondary pituitary hyperemia.