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
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