A high-energy, blunt trauma with fracture/dislocation in an extremity can result in intimal dissection or transection of the involved arterial segment, which may either compromise the lumen or lead to morbidities associated with extravasation. However, there are few reports indicating low-energy or minor blunt traumas without fracture/dislocation could result in major artery injuries in a crural region that mostly diagnosed months after the initial traumatic event. Here we present a case of rapidly expanding hematoma of the calf week after a minor blunt trauma in which hematoma originated from posterior tibial artery injury.