Teenager with headache and tremors

CT and MR of cavernous malformation
Coronal (above left) and axial (below right) CT without contrast of the brain shows a slightly hyperdense, round, poorly circumscribed lesion in the right frontal lobe. Coronal T1 MRI without contrast of the brain (above right) shows the lesion to have a popcorn appearance with small round lesions of various signal intensities. Axial gradient echo MRI (below right) shows the lesion to be surrounded by a very low signal intensity ring.

The diagnosis was cavernous malformation containing mixed blood products with a hemosiderin ring.