Perineurioma

Soft tissue
Peripheral nerve
Perineurioma

Author: Vijay Shankar, M.D.

Topic Completed: 1 November 2012

Revised: 24 February 2020

Copyright: 2002-2019, PathologyOutlines.com, Inc.

PubMed Search: Perineurioma [title]

Page views in 2019: 9,975

Page views in 2020 to date: 1,456

Table of Contents

Cite this page: Shankar V. Perineurioma. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/softtissueperineurioma.html. Accessed February 27th, 2020.

Definition / general

Uncommon benign tumor of peripheral nerve composed primarily of perineurial cells, first described in 1978
Adults, more common in females
Extremities and trunk most common sites

Case reports

23 year old man with median nerve tumor (Hand (N Y) 2010;5:286)
30 year old man with thigh mass and neurofibromatosis 2 (Am J Surg Pathol 2006;30:1624)
53 year old woman with endobronchial tumor (Patholog Res Int 2010;2010:613824)
63 year old man with retroperitoneal mass (J Med Case Rep 2010;4:290)

Clinical images

Images hosted on other servers

Endobronchial nodule

Gross description

Well circumscribed, variable size, usually NOT associated with a nerve

Microscopic (histologic) description

Bland, elongated cells in parallel bundles, resembles neurofibroma or pacinian neurofibroma; may have storiform growth
May have collagenous stroma with pericellular cracking / clefting
No atypia, rare mitotic figures
Suspect if myxoid lesion of soft tissue with storiform or fascicular growth pattern

Microscopic (histologic) images

Contributed by Mark R. Wick, M.D.

Cutaneous

EMA

Images hosted on other servers:

Median nerve

Retroperitoneum

Site unknown

Endobronchial nodule in 53 year old woman

Positive stains

EMA, CD34 (33%)

Negative stains

S100

Electron microscopy description

Non-branching, thin cytoplasmic processes, coated by external lamina, joined at ends by tight junctions, few organelles, actin and vimentin filaments, numerous pinocytotic vesicles

Electron microscopy images

Contributed by Mark R. Wick, M.D.

Perineurioma

Molecular / cytogenetics description

Monosomy 22, deletion of 22q11-13.1