A 30-year old male was being evaluated for paraparesis. On examination, there was severe muscle atrophy, with absent deep tendon reflexes and absent Babinski sign. The most likely possibility is:
(a) Upper motor neuron disease
(b) Lower motor neuron disease
(c) Psychogenic cause
(d) Cerebellar disease
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ANS- (b) Lower motor neuron disease
| UMN Lesion | LMN Lesion | |
| Tone | Increased | Decreased |
| Deep tendon reflex | Exaggerated | absent |
| Abdominal reflex | Lost | Preserved |
| Plantar reflex | Extensor (Babinski present) | Flexor (babinski absent) |
| muscle wasting | Rare | Common presentaion |