A rare cause of calf swelling: the Morel–Lavallee lesion

INTRODUCTION: Calf swelling is a common clinical presentation with a wide and varied differential diagnosis. The Morel–Lavallee is a rare cause of subcutaneous swelling, caused by post-traumatic shearing of the hypodermis from the underlying fascia. The potential space so created fills with blood, lymph and necrotic fat giving specific findings on MR evaluation. MATERIALS AND METHODS: A case of a 53-year-old man with calf swelling is presented, with clinical and MRI correlation. Treatment options and clinical course are discussed. CONCLUSION: The Morel–Lavallee lesion is a rare but important cause of calf swelling. MRI is the mainstay of diagnosis and treatment includes both surgical and minimally invasive modalities.