There is a relatively well-circumscribed lobulated lesion centered on the vastus medialis muscle, isointense to the muscles on T1WI, hyperintense on T2WI, and STIR with areas of high signal on T1WI, low signal on T2W, and STIR (haemorrhagic areas) and peripheral rim of fatty signal well-visualized on T1WI sequences. The postcontrast sequences show a prominent enhancement.