A 70-year-old woman suffered an anterior dorsal hypothalamic hemorrhage that caused an ipsilateral Horner syndrome (HS) as the only focal neurologic manifestation. This is only the second reported case of hypothalamic hemorrhage producing HS. Because HS was the sole focal neurologic manifestation, its confirmation with topical apraclonidine drops was a valuable clue toward prompt localization of the patient's confusional state.
Departments of Ophthalmology, Neurology, and Radiology (Neuroradiology), Kellogg Eye Center, University of Michigan, Ann Arbor, Michigan.
Address correspondence to Jonathan D. Trobe, MD, University of Michigan, Ann Arbor, MI; E-mail: firstname.lastname@example.org
The authors report no conflicts of interest.