A Case of Horner Syndrome with Intermittent Mydriasis in a Patient with Hypoplasia of the Internal Carotid Artery
M. Ibrahim,
H.M. Branson,
J.R. Buncic and
M.M. Shroff
From the Departments of Radiology, Hospital for Sick Children, Toronto, Ontario, Canada
Diagnostic Imaging, Hospital for Sick Children, Toronto, Ontario, Canada
Ophthalmology, Hospital for Sick Children, Toronto, Ontario, Canada
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Fig. 1. Clinical photograph demonstrating right Horner syndrome with ptosis, miosis, and iris heterochromia.
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Fig. 2. A, Source images from axial time-of-flight MRA demonstrates absence of the right ICA in the right parasellar region. The left ICA and basilar arteries are clearly seen.
B, Axial source MRA image superior to the prior image demonstrates an enlarged right PcomA.
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Fig. 3. Parasagittal T1-weighted sequence to the right of the midline demonstrates the enlarged right PcomA coursing along the superior aspect of the right third nerve.
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Fig. 4. Axial time-of-flight MRA of the neck with multiplanar intensity projection reformats demonstrating absent flow in the cervical right ICA.
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Fig. 5. Axial CT through the skull base demonstrates an atretic right carotid canal on the right. Note the normal left-sided bony carotid canal.
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