Page 1 of 1: ophthal: See saw nystagmus is seen in

decembermist · Credits: 41121 My Scrapbook

a) craniopharyngioma
b) pineal tumours
c) hyrdocephalus
d) viral encephalitis

ref pls

BRAVO · Credits: 45704 My Scrapbook

craniopharyngioma

vineetgsvm · Credits: 122753 My Scrapbook

check out emedicine link

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Seesaw nystagmus

Seesaw nystagmus is a pendular oscillation that consists of elevation and intorsion of one eye and depression and extorsion of the fellow eye that alternates every half cycle. This striking and unusual form of nystagmus may be seen in patients with chiasmal lesions, suggesting loss of the crossed visual inputs from the decussating fibers of the optic nerve at the level of the chiasm as the cause or lesions in the rostral midbrain. This type of nystagmus is not affected by otolithic stimulation

CAUSES (of all nystagmuses)

Seesaw nystagmus
Rostral midbrain lesions

Parasellar lesions (eg, pituitary tumors)

Visual loss secondary to retinitis pigmentosa

Downbeat nystagmus
Lesions of the vestibulocerebellum and underlying medulla (eg, Arnold-Chiari malformation, microvascular disease with vertebrobasilar insufficiency, multiple sclerosis, Wernicke encephalopathy, encephalitis, lithium intoxication)

Heat stroke

Approximately 50% have no identifiable cause.

Upbeat nystagmus
Medullary lesions, including perihypoglossal nuclei, the adjacent medial vestibular nucleus, and the nucleus intercalatus (structures important in gaze holding)

Lesions of the anterior vermis of the cerebellum

Benign paroxysmal positional vertigo
Periodic alternating nystagmus
Arnold-Chiari malformation

Demyelinating disease

Spinocerebellar degeneration

Lesions of the vestibular nuclei

Head trauma

Encephalitis

Syphilis

Posterior fossa tumors

Binocular visual deprivation (eg, ocular media opacities)

Pendular nystagmus
Demyelinating disease

Monocular or binocular visual deprivation

Oculopalatal myoclonus

Internuclear ophthalmoplegia

Brainstem or cerebellar dysfunction

Spasmus nutans

Usually occurs in otherwise healthy children
May be caused by chiasmal, suprachiasmal, or third ventricle gliomas
Torsional - Lateral medullary syndrome (Wallenberg syndrome)
Abducting nystagmus of internuclear ophthalmoplegia
Demyelinating disease
Brain stem stroke

Gaze evoked
Drugs - Anticonvulsants (eg, phenobarbital, phenytoin, carbamazepine) at therapeutic dosages
Alcohol

candy · Credits: 15282 My Scrapbook

thnx 4 de list vineet!!

BRAVO · Credits: 45704 My Scrapbook

thanks 4 the list vineet,

basically seesaw nystagamus is seen in chiasmal lesion thats why i chose craniopharyngioma...

hey misty whats the answer?

decembermist · Credits: 41121 My Scrapbook

ans given is Craniopharyngioma

gandalf · Credits: 8375 My Scrapbook

thx vineet and decembermist.......

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