Brainstem stroke syndromes
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1. Medial medullary syndrome results from lesions of the corticospinal tract, medial lemniscus, and hypoglossal nucleus, causing contralateral hemiparesis, loss of trunk/extremity sensation, and ipsilateral tongue paralysis respectively. 2. Lateral medullary syndrome results from lesions affecting structures like the vestibular nuclei, inferior cerebellar peduncle and vagal nuclei, causing nystagmus, ipsilateral cerebellar signs, and laryngeal/pharyngeal paralysis. 3. Pontine syndromes include medial inferior pontine syndrome affecting corticospinal and medial lemniscus tracts and lateral inferior pontine syndrome affecting
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Brainstem stroke syndromes
- 1. BRAINSTEM STROKE SYNDROMES Dr. Piyush Ranjan Sahoo
- 2. LESIONS OF THE MEDULLA • Medial medullary syndrome • Lateral medullary syndrome
- 4. Medial medullary syndrome (anterior spinal artery syndrome). Affected structures and resultant deficits include: • corticospinal tract medullary pyramid Lesions result in contralateral spastic hemiparesis. • medial lemniscus. Lesions result in contralateral loss of tactile and vibration sensation from the trunk and extremities. • hypoglossal nucleus or intraaxial root fibers [cranial nerve (CN) XII]. Lesions result in ipsilateral flaccid hemiparalysis of the tongue When protruded the tongue points to the side of the lesion (i.e., the weak side).
- 7. Lateral medullary syndrome or posterior inferior cerebellar artery (PICA) syndrome characterized by dissociated sensory loss Affected structures -- resultant deficits include: 1. vestibular nuclei Lesions result in nystagmus, nausea, vomiting, and vertigo. 2. inferior cerebellar peduncle Lesions result in ipsilateral cerebellar signs e.g., dystaxia, dysmetria (past pointing), dysdiadochokinesia].
- 8. 3. nucleus ambiguus of CN IX, CN X, and CN XI. Lesions result in · ipsilateral laryngeal, pharyngeal, and palatal hemiparalysis · i.e., loss of the gag reflex (efferent limb) dysphagia dysphonia (hoarseness)]. 4. glossopharyngeal nerve roots. ■ Lesions result in loss of the gag reflex (afferent limb). 5. Vagal nerve roots Lesions result in • same deficits as seen in lesions involving the nucleus ambiguus •
- 9. 6. SPINOTHALAMIC TRACTS LESIONS RESULT IN CONTRALATERAL LOSS OF PAIN AND TEMPERATURE SENSATION FROM THE TRUNK AND EXTREMITIES. 7. SPINAL TRIGEMINAL NUCLEUS AND TRACT • LESIONS RESULT IN IPSILATERAL LOSS OF PAIN AND TEMPERATURE SENSATION FROM THE FACE FACIAL HEMIANESTHESIA). 8. DESCENDING SYMPATHETIC TRACT. LESIONS RESULT IN IPSILATERAL HORNER'S SYNDROME ■ I.E., PTOSIS, MIOSIS • HEMIANHIDROSIS APPARENT ENOPHTHALMOS
- 13. Medial inferior pontine syndrome • results from thrombosis of the para median branches of the basilar artery. Affected structures-- • Corticospinal tract Lesions result in contralateral spastic hemiparesis. • Medial lemniscus Lesions result in contralateral loss of tactile sensation from the trunk extremities. • Abducent nerve roots Lesions result in ipsilateral lateral rectus paralysis.
- 14. Lateral inferior pontine syndrome • anterior inferior cerebellar artery (AICA) syndrome Affected structures and resultant deficits include-- • facial nucleus and intraaxial nerve fibers Lesions result in: · Ipsilateral facial nerve paralysis · Ipsilateral loss of taste from the ant. 2/3 of tongue · Ipsilateral loss of lacrimation and reduced · salivation · Loss of corneal and stapedial reflexes (efferent limbs).
- 15. Discussion • Best practices • Take-aways
- 17. • Cochlear nuclei and intraaxial nerve fibers Lesions result in unilateral central deafness. • Vestibular nuclei and intraaxial nerve fibers Lesions result in nystagmus, nausea, vomiting and vertigo. • Spinal trigeminal nucleus and tract Lesions result in ipsilateral loss of pain and temperature sensation from the face (facial hemianesthesia). • Middle and inferior cerebellar peduncles Lesions result in ipsilateral limb and gait dystaxia. • Splnothalamic tracts (spinal lemniscus). Lesions result in contralateral loss of pain and temperature sensation from the trunk and extremities. • Descending sympathetic tract Lesions result in ipsilateral Homer's syndrome.
- 18. Medial longitudinal fasciculus (MLF) syndrome • internuclear ophthalmoplegia) interrupts fibers from the contralateral • abducent nucleus that projects through the MLF to the ipsilateral medial rectus • subnucleus of CN III causes- -medial rectus palsy on attempted lateral conjugate gaze and -nystagmus in the abducting eye. -Convergence remains intact. • This syndrome is often seen in patients with multiple sclerosis.
- 19. INTERNUCLEAR OPHTHALMOPLEGIA RESULTS FROM LESIONS IN THE MEDIAL LONGITUDINAL FASCICULUS CONNECTING THE IPSILATERAL CN VI AND THE CONTRALATERAL CN III NUCLEI
- 20. APPENDIX
- 21. Facial colliculus syndrome usually results from a pontine glioma or a vascular accident • internal genu of CN VII • nucleus of CN VI underlie the facial colliculus. • Lesions of the internal genu of the facial nerve cause: -Ipsilateral facial paralysis -Ipsilateral loss of the corneal reflex • Lesions of the abducent nucleus cause: -Lateral rectus paralysis -Medial (convergent) strabismus -Horizontal diplopia
- 22. LESIONS OF THE MIDBRAIN Dr. Piyush Ranjan Sahoo
- 23. Dorsal midbrain (Parinaud's) syndrome often the result of a • pinealoma or germinoma of the pineal region. Affected structures and resultant deficits include:- • superior colliculus and pretectal area Lesions cause -paralysis of upward and downward gaze -pupillary disturbances(Pseudo-Argyll Robertson pupils) -absence of convergence(Convergence- Retraction nystagmus on Attempts at upward gaze) • cerebral aqueduct -Compression causes noncommunicating hydrocephalus.
- 24. Paramedian midbrain (Benedikt) syndrome • oculomotor nerve roots (intraaxial fibers). Lesions cause -complete ipsilateral oculomotor paralysis -Eye abduction and depression • caused by intact lateral rectus (CN VI) and superior oblique (CN IV) muscles Ptosis -paralysis of the levator palpebra muscle) and -fixation and dilation of the ipsilateral pupil -complete internal ophthalmoplegia) also occur. • dentatothalamic fibers Lesions cause -contralateral cerebellar dystaxia with intention tremor. • medial lemniscus Lesions result in -contralateral loss of tactile sensation from the trunk and extremities.
- 25. Medial midbrain (Weber) syndrome Affected structures and resultant deficits include: • Oculomotor nerve roots (intraaxial fibers). Lesions cause- -complete ipsilateral oculomotor paralysis -Eye abduction and depression caused by intact lateral rectus (CN VI) and superior oblique (CN IV) muscles. -Ptosis and fixation -dilation of the ipsilateral pupil also occur. • corticospinal tracts Lesions result in contralateral spastic hemiparesis.
- 26. Contd… • corticobulbar fibers Lesions cause -contralateral weakness of · lower face (CN VII) · tongue (CN XII) · palate (CN X) upper face division of the facial nucleus receives bilateral corticobulbar input, uvula and • pharyngeal wall pulled toward the normal side (CN • X), protruded tongue points to the weak side.
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