A 19-year-old man presented with a right temporal pulsatile mass that developed after penetrating trauma. The stab wound trauma occurred approximately 10 months ago, resulting in profuse bleeding at the site of the trauma and a loss of consciousness for several hours. The patient was monitored for several hours in the outpatient emergency room and was discharged after stabilization and suturing of the trauma site. The day after discharge, the patient started to hear a bruit on the right side, and 10 days after that, the trauma site developed progressive swelling. Ten months later, the patient was referred to the medical center for an increased hearing bruit following sleeping on the right side. Based on history and evidence, CT angiography was performed. The patient’s CTA result showed a round swelling in the right superficial temporal artery, which, given the etiology, indicated diagnosed as a pseudoaneurysm of the right superficial temporal artery. Digital subtraction angiography (DSA) was performed on the patient and underwent endovascular treatment with Coil and Onyx. The treatment of choice is excision, although endovascular intervention is a potential treatment option. However, when a pseudoaneurysm is small, conservative treatment can be used.