Tumor híbrido de la vaina del nervio periférico de localización digital con componente neurofibroma-perineuroma. Descripción de un caso y revisión de la literatura

Hybrid peripheral nerve sheath tumour is a rare mesenchymal benign neoplasm recently included in the WHO classification of soft tissue tumours. It has a wide distribution but predominantly affects limbs and trunk. Histological findings reveal the presence of 2 or more cellular components originating in the peripheral nerve sheath with variable proportions of neurofibroma, schwannoma and perineurioma. We report a case of a 65-year-old male with a painless nodule in the 5th finger of his left hand which showed microscopic features of neurofibroma and perineurioma. We review the histological and immunohistochemical findings of this unusual, and often over-looked, tumour in the recent literature.