Intraneural perineurioma is a rare peripheral nerve sheath tumor consisting of intraneural proliferation of neoplastic perineurial cells.

Synopsis

 numerous whorls consisting of concentric layers of spindle cells encircling the nerve fibers

Imunochemistry

 vimentin
 epithelial membrane antigen
 glucose transporter protein 1 + (GLUT1 +)
 S-100 -
 CD34 -

Ultrastructure

 perineurial cell differentiation