Compartment syndrome occurs when pressure builds up within an enclosed muscular compartment due to swelling or internal bleeding. It is most likely to occur in the leg following fractures of either the tibia or fibula, but rarely occurs in the thigh. A 27 y.o. male presented to the Emergency Department complaining of severe pain in his left thigh. He works at a fast food retail shop, runs marathons regularly (but hasn’t in the past 4 months) and he recalls no trauma to the leg over the weeks preceding the pain. When he was admitted to the ED, he was started on high dose pain medications, without relief. Labs results returned revealing a low hemoglobin and an unremarkable PT/PTT, WBC, UA, and EKG. Physical examination revealed that the left