Trauma to the left hip with persistent subcutaneous swelling for three months
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A left upper anterolateral thigh thick-walled lentiform cystic lesion is seen overlying the greater tuberosity of the femur, it demonstrates low T1 and bright T2/STIR signal intensity. The lesion is seen located deeply subcutaneous and splitting the superficial and deep layer of the deep fascia.
The lesion shows small septations within, and shows a thick hypointense pseudocapsule enclosing it. Normal both hip joints. No joint effusion. No marrow signal abnormality. Intact periarticular hip musculature with no soft tissue mass lesion.
Morel-Lavallée lesion of the left upper anterolateral thigh overlying the greater tuberosity of the femur secondary to closed degloving or shearing injury with splitting of the deep fascia between the tensor fascia lata and subcutaneous fat.