[Atypical femur fracture in denosumab treatment and as a rare differential diagnosis to nerve root affection].

In this case report, we present an instance of an atypical femur fracture in a patient receiving denosumab treatment. Due to MRI-verified severe lateral recess stenosis, her symptoms are misinterpreted because of nerve root affection and treated as such with surgical decompression. Not until postoperatively was the atypical femur fracture of the left leg diagnosed and finally treated. With this case report, we aim to raise awareness of atypical femur fracture as a differential diagnosis for nerve root affection and explore the possible connection between denosumab and atypical femur fracture.