P09 A case series of anetodermic pilomatrixomas

Abstract Pilomatrixoma is a benign tumour that arises from the base of the hair follicle matrix. Anetodermic changes overlying the tumour occur in only 2% of the cases. The aim of this study is to evaluate a case series of paediatric patients who presented with anetodermic pilomatrixoma to our Paediatric Dermatology department. A retrospective analysis of all our paediatric cases with a clinical diagnosis of anetodermic pilomatrixoma within the last 4 years was made. Data were collected according to age at time of presentation, suspected clinical diagnosis, histopathological features, treatment and postoperative outcomes. Five cases were identified. All were referred as a rapidly growing tumour. The median age of onset was 15 years. The male : female ratio was 3 : 2; one presented on the neck, two on the upper limbs and two on the back. Two out of three patients reported that the lesions were painful. Clinical suspicion of anetodermic pilomatrixoma (large, atrophic, wrinkled lesion overlying a firm subcutaneous mass) was made prior to surgical removal. Four were confirmed histopathologically. Simple excision was carried out without any postoperative complications. There have been no recurrences. Anetodermic pilomatrixoma, also referred to as pseudobullous pilomatrixoma, is a rare variant of pilomatrixomas, occurring more frequently in the upper body. It presents with identifiable features but should be differentiated from other skin tumours. Pain can be a symptom due to the size of the lesion. Surgical removal is the gold standard treatment with a low recurrence rate.