Axial T1-weighted MRI of the thigh (A) and lower leg (B) for case 1 shows fatty infiltration of the quadriceps and adductor muscles (L2, 3 and 4 myotomes; A) and tibialis anterior (L5; B) but sparing of soleus, gastrocnemius and the hamstring muscles (S1). Axial T1-weighted MRI of the thigh (A) and lower leg (B) for case 1 shows fatty infiltration of the quadriceps and adductor muscles (L2, 3 and 4 myotomes; A) and tibialis anterior (L5; B) but sparing of soleus, gastrocnemius and the hamstring muscles (S1). Chin Yong Kok et al. Pract Neurol 2019;19:72-74 ©2019 by BMJ Publishing Group Ltd