Morel-lavallee lesion (MLL) represents post traumatic subcutaneous cyst 
generally overlying bony prominences like greater trochanter, lower back, knee 
and scapula. A 51-year-old man presented with a swelling in left thigh since six 
years which was insidious in onset, gradually progressive in size and not 
associated with pain, fever or discharge. There was no history of trauma or any 
associated constitutional symptoms. Since there was no history of trauma 
recalled by the patient the clinical dilemma was between soft tissue sarcoma and 
cold abscess. We report a case of slow growing painless mass lesion of thigh, 
diagnosed on Magnetic Resonance Imaging (MRI) as morel lavallee lesion and 
describe its salient imaging features with treatment options.