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American Journal of Surgical Pathology:
doi: 10.1097/PAS.0b013e31827edfda
Original Articles

A Benign Cutaneous Plexiform Hybrid Tumor of Perineurioma and Cellular Neurothekeoma

Requena, Luis MD*; Sitthinamsuwan, Panitta MD; Fried, Isabella MD; Kaddu, Steven MD; Schirren, Carl Georg MD§; Schärer, Leo MD; Hantschke, Markus MD; Cerroni, Lorenzo MD; McCalmont, Timothy H. MD; Kutzner, Heinz MD

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Abstract

There are several recent reports describing hybrid peripheral nerve sheath tumors showing a biphasic component of neoplastic cells. These combinations include a mixture of neurofibroma and schwannoma, schwannoma and perineurioma, neurofibroma and perineurioma, and perineurioma and granular cell tumor. A case of a triphasic combination of neurofibroma, schwannoma, and perineurioma has also been described. We describe the clinicopathologic and immunohistochemical characteristics of 9 cases of a benign cutaneous plexiform nerve sheath tumor located on the lips and exhibiting hybrid features of perineurioma and cellular neurothekeoma. Clinically, lesions were solitary dome-shaped papules located on the lips. Histopathologically, the neoplasms consisted of well-circumscribed but uncapsulated dermal nodules with a plexiform pattern. They were composed of nests or rounded aggregations of neoplastic cells embedded in a slightly myxoid stroma. Within the aggregates, cells were distributed in a storiform and lamellar pattern. Immunohistochemically, most neoplastic cells expressed strong immunoreactivity for S100A6, MiTF, NKI/C3, PGP9.5, EMA, and NSE, whereas variable, focal, and weaker positivity for CD34, claudin-1, and Glut-1 was seen in some cases. On the basis of these findings, we believe that this neoplasm is a distinctive benign cutaneous plexiform nerve sheath tumor with histopathologic and immunohistochemical hybrid features of perineurioma and cellular neurothekeoma.

© 2013 Lippincott Williams & Wilkins, Inc.

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