Abstract
Lesions ranging from cysts to benign and malignant tumors can affect the pinna. The clinical appearance, duration, progression, and histopathology of the lesion are important in differentiating non-neoplastic conditions from neoplasms. We present a case report of an unusual nodular pinna lesion that was excised under local anaesthesia. Histopathology revealed cutaneous aneurysmal fibrous histiocytoma. Aneurysmal benign fibrous histiocytoma is an unusual variant of soft tissue tumor with low intermediate malignant potential, which has to be differentiated from other benign and malignant tumors.
 Keywords: Benign fibrous histiocytoma; external ear; fibrous tissue neoplasms.
Highlights
Nodules of the pinna range from epidermal cyst, chondrodermatitis nodularis chronica helicis, keloid, hemangioma, skin tag, seborrheic keratosis, pyogenic granuloma, tumors of the skin and adnexa like trichofolliculoma, trichoepithelioma and tumors of soft tissue like leiomyoma and dermatofibroma
The clinical appearance, duration and progression of the lesion are important in differentiating non-neoplastic conditions from neoplasms (1, 2)
Aneurysmal Benign Fibrous Histiocytoma (ABFH) of the skin is a distinct variant with a reported incidence of 1.7% of all benign fibrous histiocytomas (4), first described by Santa Cruz and Kyriakos in 1981
Summary
Nodules of the pinna range from epidermal cyst, chondrodermatitis nodularis chronica helicis, keloid, hemangioma, skin tag, seborrheic keratosis, pyogenic granuloma, tumors of the skin and adnexa like trichofolliculoma, trichoepithelioma and tumors of soft tissue like leiomyoma and dermatofibroma. The clinical appearance, duration and progression of the lesion are important in differentiating non-neoplastic conditions from neoplasms (1, 2). Histomorphology is the corner stone of final diagnosis and especially so in evaluating borderline soft tissue neoplasms with potential for local recurrence and loco-regional spread (2-4). Soft bluish swelling over the conchal aspect of left pinna, with a smooth vascular surface (Fig. 1). It was non-tender, without a local rise in temperature. The lesion was excised under local anaesthesia (Fig. 2) and the wound was sutured for healing by primary intention. The patient came for follow-up for up to 6 months and was not found to have recurrence
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