Plexiform schwannoma.

A 33-year-old man had a multinodular tumor on his left index finger. Microscopy revealed a plexiform nerve sheath tumor resembling schwannoma. Including this case, 11 patients from 9 to 39 years old, have been reported with plexiform schwannoma. One patient had von Recklinghausen's neurofibromatosis, and all but one were free of recurrence from 1.5 to 6 years later. Plexiform schwannoma should be distinguished from plexiform neurofibroma because it appears to have neither a significant association with neurofibromatosis nor a propensity for malignant transformation.