Involuting solitary cutaneous infantile myofibroma and thrombocytopaenia: a previously unreported clinical association.

Solitary and multicentric myofibromas are rare fibrous tumours with marked predilection for infants and young children. Presentation is mainly before the age of 2 and lesions are often congenital. Behaviour is usually benign, but mortality has been described in lesions with visceral involvement. We report a unique case of congenital solitary cutaneous infantile myofibroma in a neonate associated with self-limiting thrombocytopaenia. It is important to distinguish accurately these lesions from benign vascular tumours like haemangiomas, locally aggressive vascular tumours like Kaposiform haemangioendotheliomas, which are often associated with Kasabach-Merritt phenomenon and also with malignant soft tissue tumours of infancy.