Ultrasound and MR findings in sclerosing perineurioma.

Perineurioma is an unusual benign peripheral nerve sheath tumor that includes intraneural, soft tissue (conventional), reticular and sclerosing types. Sclerosing perineurioma is a recently described distinctive variant occurring nearly exclusively on the hands of young adults, in which it presents as a small, painless, dermal or subcutaneous mass. The only report of imaging findings in sclerosing perineurioma was by Miyake et al., who described the MR findings in 2006. However, there have been no reports of the ultrasound features. We report a 22-year-old man with sclerosing perineurioma and describe the lesion's ultrasound and MR features.