Page 112 - Rule Outs in Small Animal Medicine, Problem-oriented Assessment of Problems in Physical Examination and Clinical Pathology, 2nd Edition

Neurology Neurology
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Anisocoria

Mydriasis

Unilateral
mydriasis
(reduced/no Unilateral
direct pupillary miosis
light reflex)
No menace reaction* Normal menace
reaction
(blind)
Lesion of the Peripheral (normal vision)
Horner's
parasympathetic Iris atrophy blindness syndrome Painful ocular Drugs
disease
nervous system unilateral
– Hyper- – Otitis media – Uveitis – Opioids
Therapy with Lesion of the tensive – Lesion of the – Corneal â Peripheral Lesion of the – Atropine
atropine oculomotor nerve – Other – Other mydriatic drugs
retinopathy roots of ulcer para- blindness oculomotor nerve/ – Excitement
– Glaucoma T1–T3 sympatho- p. 101 midbrain – Iris atrophy/degeneration (old dogs)
mimetic
– Retinal (avulsion) drugs – Glaucoma
– Herniation detachment – Lesion of the
– Neoplasia – Optic vago-
– Inflammation neuritis sympathetic
– Trauma – Neoplasia trunk
– Other eye – Thoracic Peripheral Central
diseases lesion
– Cervical
spinal cord
lesion
– CNS lesion
(brainstem) – FeLV – Neoplasia
– Idiopathic – Dysautonomia – Meningoencephalitis
Horner's – Botulism (rare) – Infarction/haemorrhage
syndrome – Neuropathy of CN III
(common) – Increased intracranial
– Orbital lesions pressure

*
Menace reaction is physiologically absent in dogs ≤ 12 weeks of age

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