{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T14:23:25Z","timestamp":1787840605222,"version":"build-2784847793"},"reference-count":11,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"6","license":[{"start":{"date-parts":[[2025,11,1]],"date-time":"2025-11-01T00:00:00Z","timestamp":1761955200000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["lww.com","ovid.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2025,11]]},"abstract":"<jats:p>Accessory mitral valve tissue is a rare congenital anomaly that may cause left ventricular outflow tract obstruction. This may be the first case report in a neonate, describing accessory mitral valve tissue producing a significant left ventricular outflow tract obstruction, resulting in a duct-dependent systemic circulation perfusing the neck and head vessels. 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