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CAUSES OF OCCULOMOTOR PALSY

Neurology

CAUSES OF OCCULOMOTOR PALSY

1. Central causes - vascular lesions, stroke, MS involving the brainstem.

2. Peripheral causes - pupillary PARASYMPATHETIC fibres are located on the dorsum of the CN 3 and blood supply is from the nerve sheath and not from the trunk. Hence, they are affected by pressure from mass lesions (such as aneurysms) but not infarction of the CN 3 (as in diabetes).

- Pupillary Sparing: Intrinsic lesionS (PSIS). Cause: DM.
- Pupillar Involving: Extrinsic lesionS (PIES). Causes: PCOM aneurysm, meningioma, NPC, superior orbital tumor (Talosa-Hunt Syndrome), basal meningitis.


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REFERENCES

1. Wilkinson, I. (2017). Oxford handbook of clinical medicine. Oxford: Oxford University Press.
2. Hannaman, R. A., Bullock, L., Hatchell, C. A., & Yoffe, M. (2016). Internal medicine review core curriculum, 2017-2018. CO Springs, CO: MedStudy.
3. Image: no reference available.

Ⓒ A. Manickam 2018

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