The patient was admitted to the Department of Neurology at the age 4 years and 10 months. On neurological examination his cranial nerves and upper extremities were normal except for slight dysdiadochokinesia. Detailed laryngological examination revealed slight floppiness

of uvula and vocal cords. Marked bilateral atrophy of the calves and pes equinovarus were observed. Hypotonia, paralysis of distal muscles and loss of the ankle jerks were noted. No sensory disturbances were Inhibitors,research,lifescience,medical observed. The patient could not walk and could not stand on his toes even with bilateral support. He reported independent walking (after orthopedic correction of his foot), at the age of 6 years. Weakness and atrophy of the Inhibitors,research,lifescience,medical lower limb muscles progressed in the second decade of his life, forcing him to use braces when walking. Distal muscle atrophy and

weakness of the hands appeared at the end of the second decade and subsequently Navitoclax worsened. He became wheelchair-bound at age 27 years. Hoarseness occurred at 29 years of age. He was seen by one of Inhibitors,research,lifescience,medical us (AK) at age 32 years. Upon examination, marked distal muscle atrophy and weakness with dropping hands, hypotonia, areflexia (except for right triceps jerk) were found in the upper limbs. He presented pronounced global atrophy, total paralysis of distal muscles and marked weakness of proximal muscles, knee contractures, areflexia and impairment of position sense distally in his lower extremities. The vibration sense was more decreased in the lower limbs than in the upper limbs. Skeletal abnormalities (high arched palate, chest deformity, pes cavus) were present. Electrophysiological examinations were Inhibitors,research,lifescience,medical performed on two separate occasions. At 5 years, median nerve motor conduction velocity was 31.2 m/s and compound

muscle potential (CMAP) was 150 μV. There was no response to stimulation of motor fibres of the peroneal nerve and sensory fibres of the median and sural nerves. Concentric needle electromyography (CNEMG) revealed slight neurogenic Inhibitors,research,lifescience,medical changes in the first dorsal interosseus muscle, no spontaneous or voluntary activity in the anterior tibial muscle. EMG study C59 wnt of the rectus femoris muscle was within normal limits. Repeat electrophysiological examination at 32 years revealed no response to the stimulation of ulnar and tibial motor fibres and sensory fibres of ulnar and sural nerves. Conduction time in the motor fibres of musculo-cutaneous, axillary and facial nerves was within normal limits (50 ms, 4.2 ms, 3.7 ms, respectively), but amplitudes of CMAP from biceps and deltoid muscles were decreased (0.6 mV, 0.1 mV, respectively). CNEMG of biceps brachii muscle was compatible with chronic neurogenic lesion. There was no voluntary activity in rectus femoris, anterior tibialis and the first dorsal interosseus muscle. In the rectus femoris muscle, denervation activity was present at rest.