Extensive soft tissue emphysema in the lower extremity, including throughout the adductor and posterior compartment muscles with relative sparing of the anterior compartment.
Air tracks from the level of the hip joint at its cephalad-most extent through the posterior aspect of the proximal calf musculature and extends beyond the caudad field of view. There was no drainable rim enhancing collections visualized.
A crescentic fluid collection is most prominently visualized apposed to the medial aspect of investing fascia of the posterior compartment with interdigitating locules of air. Fat stranding is visualized throughout subcutaneous fat, most prominently on the posterior/medial aspect of the extremity.
There were no visualized osseous destructive changes in the femur, left hemipelvis, proximal tibia, or proximal fibula.