MR imaging of pachydermoperiostosis.

A case of pachydermoperiostosis who demonstrated the whole syndrome (pachyderma, periostitis, and cutis verticis gyrata) is presented, and the Magnetic Resonance Imaging (MRI) appearances of the long bone and scalp changes are demonstrated. MRI of the cruris demonstrated fluffy periosteal new bone formation that encroached on the medullary cavity as well as expansion of the diaphysis. Cranial changes included thickening of the diploe associated with diminished signal of the intradiploic fat, and thickening of the scalp with furrowing.