Palisaded Encapsulated Neuroma—A Classic Presentation of a Commonly Misdiagnosed Neural Tumor

January 2005 | Volume 4 | Issue 1 | Case Reports | 92 | Copyright © January 2005

Olga Golod, Teresa Soriano MD, Noah Craft MD PhD

Abstract
We present a case report of a classical presentation of palisaded encapsulated neuroma (PEN) of the skin occurring on the nasolabial crease and a review of the literature. A young woman presented with a smooth lobulated papule on the cheek enlarging over 2 years. Histologic examination revealed a well-circumscribed dermal nodule of small spindle cells with wavy nuclei arranged in fascicles, consistent with the diagnosis of PEN. PEN is a previously described, benign cutaneous neural tumour,1 with a histological appearance between that of a neurofibroma and a schwannoma.2 Though not uncommon, PEN remains under-diagnosed by many pathologists. Clinically, PEN is most commonly misdiagnosed as a basal cell carcinoma, a nevus, or as a neurofibroma.3