Traumatic pseudoaneurysm of limb arteries are relatively rare. A 70-year-old gentleman, with history of mechanical aortic valve implantation on warfarin, presented to the emergency department with pain and swelling in the right leg. He had sustained blunt injury to the leg, a week prior to presentation. On examination, the lateral compartment of the leg was swollen, ecchymotic, and tense. Distal pulses were well palpable. An ultrasound Doppler evaluation revealed a large intramuscular hematoma in the lateral compartment with a pseudoaneurysm of a muscular branch of the anterior tibial artery. An ultrasound-guided compression of the pseudoaneurysm was initially attempted for 24 hours, which failed in closing off the pseudoaneurysm. He was subsequently taken up for thrombin injection into the pseudoaneurysm, which resulted in instant thrombosis of the pseudoaneurysm, with an uneventful clinical course thereafter. Thrombin injection is an effective and safe modality to treat pseudoaneurysms of limb arteries.