Although granular cell tumours have been demonstrated to have a neural orig
in, they rarely arise in peripheral nerve trunks. We report a case of granu
lar cell tumour of the ulnar nerve in a 51-year-old man, Though dissectable
from the nerve, this intraneural tumour showed microscopic involvement of
focal nerve fibres, This tumour tended to infiltrate the nerve in the same
manner as a neurofibroma.