Quadratus femoris muscle injury mimicking a sarcoma

We report a previously fit and well lady in her 50s who was referred to our tertiary center sarcoma multi-disciplinary team (MDT) after a magnetic resonance imaging (MRI) report from another center raised concern over a sarcoma in the left quadratus femoris muscle. MDT review suggested this was more in keeping with an acute muscle tear and after follow up MRI showed significant improvement in appearances, the patient was discharged with a diagnosis of a left quadratus femoris muscle injury. Quadratus femoris muscle injuries have not been widely reported in literature, and most papers describe an impingement of the muscle or tendinitis rather than a tear. This is an unusual case where an equivocal initial impression led to sarcoma MDT referral and highlights the value of clinical correlation and follow up imaging.