Differentials 1) selective muscle hypertrophy secondary to Spontaneous Repetitive Discharges most possibly stemming from a nerve root lesion. 2) rupture of rectus femoris component of the quadriceps femoris, leading to a bunching up of the muscle 3) soft tissue sarcoma ( i am putting this in very reluctantly )
credit to you for picking it up, lipoatrophy is clear ( clear from the mri as well ), but if it is due to insulin therapy (although lipodystrophy / hypertrophy is more common ) or for that matter growth hormone or Copaxone therapy ( for Multiple sclerosis ) - then why would somebody take an mri for it ?
