A 10 year-old boy was seen with an asymptomatic subcutaneous mass on the left frontotemporal region of the skull. The patient gave a history of involving in a traffic accident 20 days before this visit. Physical examination was consistent with an aneurysm of the superficial temporal artery. Histological examination following surgical excision revealed a pseudoaneurysm arising on superficial temporal artery. Pseudoaneurysm of superficial temporal artery is a rarely seen condition, with fewer than 200 cases reported. In this paper we report a case of pseudoaneurysm of superficial temporal artery and the literature was reviewed.