A rare cause of Horner syndrome
Costello D., Salmon J., Milford C., Pretorius P.
<jats:title>Abstract</jats:title><jats:sec id="S0022215109992544_sec1"><jats:title>Objectives:</jats:title><jats:p>To demonstrate the importance of thorough investigation of patients with Horner syndrome, and to explain the relevant anatomy.</jats:p></jats:sec><jats:sec id="S0022215109992544_sec2"><jats:title>Case report:</jats:title><jats:p>A 46-year-old man presented with right-sided Horner syndrome. No other abnormality was found. Magnetic resonance imaging showed calcification of the stylohyoid ligament, with a pseudoarthrosis in the mid-portion of the ligament. This pseudoarthrosis was displacing and compressing the internal carotid artery and the adjacent sympathetic chain, causing Horner syndrome.</jats:p></jats:sec><jats:sec id="S0022215109992544_sec3"><jats:title>Conclusion:</jats:title><jats:p>In this case, magnetic resonance imaging was invaluable in elucidating the cause of the Horner syndrome. This is the first described case of pseudoarthrosis of a calcified stylohyoid ligament causing Horner syndrome.</jats:p></jats:sec>