FIGURE 8.

Muscle atrophy, ‘marbled’ appearance and atypical findings. (a) Bilateral atrophy of sternocleidomastoideus (top). Asymmetrical atrophy of sternocleidomastoideus (middle) and pectoralis minor (bottom). (b) Diffuse ‘marble’ texture of muscle tissue in lower limbs. (c) Atypical findings in different patients: transversus abdominis more affected than rectus abdominis with asymmetrical involvement (asterisk), gluteus maximus more affected than gluteus minimus (arrows), isolated involvement of extensor digitorum longus (arrowheads), peroneal muscles more affecter than tibialis anterior (outlined arrows)