Classification

 sclerosing perineurioma
 malignant perineurioma (#10841650#)

Molecular biology

 mutations in the NF2 gene (#11290539#)

Differential diagnosis

 epithelioid histiocytoma (#11012740#)

References

 Robson AM, Calonje E. Cutaneous perineurioma: a poorly recognized tumour often misdiagnosed as epithelioid histiocytoma. Histopathology. 2000 Oct;37(4):332-9. PMID: #11012740#