Principal patterns of loss of sensation.
(a) Thalamic lesion: sensory loss throughout opposite side (rare).
(b) Brainstem lesion: contralateral sensory loss below face and ipsilateral loss on face.
(c) Central cord lesion, e.g.
syrinx: 'suspended' areas of loss, often asymmetrical and 'dissociated', i.e. pain and temperature loss but light touch intact.
(d) Hemisection of cord/unilateral cord lesion = Brown—Séquard syndrome: contralateral spinothalamic (pain and
temperature) loss with ipsilateral weakness and dorsal column loss below lesion.
(e) Transverse cord lesion: loss of all
modalities, including motor, below lesion.
(f) Dorsal column lesion, e.g. MS: loss of proprioception, vibration and light
touch.
(g) Individual sensory root lesions, e.g. C6, T5, L4.
(h) Polyneuropathy: distal sensory loss.
#Diagnosis #Neurology #Patterns #Sensory #Sensation #Loss #Deficit #Distribution #BrownSequard #Bilaterality
** GrepMed Recommended Text: Comprehensive Review in Clinical Neurology - https://amzn.to/2WxWZeP