TY - CHAP M1 - Book, Section TI - Horner Syndrome A1 - Hay, Jr, William W. A1 - Levin, Myron J. A1 - Deterding, Robin R. A1 - Abzug, Mark J. PY - 2017 T2 - Quick Medical Diagnosis & Treatment Pediatrics AB - Caused by an abnormality or lesion to the sympathetic chainCongenital variety is most commonly the result of birth traumaAcquired cases may occur in children who have had cardiothoracic surgery, trauma, neoplasm, or brainstem vascular malformationMost worrisome cause is neuroblastoma of the sympathetic chain in the apical lung region SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/04/24 UR - accesspediatrics.mhmedical.com/content.aspx?aid=1145456210 ER -