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<p>Accessory mitral valve tissue (AMVT) is a rare congenital cardiac anomaly. The majority of affected patients are under 18 years of age, and AMVT may lead to left ventricular outflow tract (LVOT) obstruction. We present a case of a 33-year-old pregnant woman (gravida 2, para 2) who underwent detailed fetal echocardiography at 28 weeks of gestation, which demonstrated obstructive AMVT. At 4 months of age, the infant underwent surgical resection owing to an increased pressure gradient across the LVOT and ventricular septal thickening at the LVOT. This case highlights the diagnostic value of fetal echocardiography in identifying AMVT and the importance of regular postnatal follow-up.</p>

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Prenatal Diagnosis of Obstructive Accessory Mitral Valve Tissue

  • 期刊论文

  • 发表日期：

    2026年3月14日

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  • Peng Zou,
  • Xinyun Xu,
  • Jingsi Huang,
  • Shanquan Sun

摘要

Accessory mitral valve tissue (AMVT) is a rare congenital cardiac anomaly. The majority of affected patients are under 18 years of age, and AMVT may lead to left ventricular outflow tract (LVOT) obstruction. We present a case of a 33-year-old pregnant woman (gravida 2, para 2) who underwent detailed fetal echocardiography at 28 weeks of gestation, which demonstrated obstructive AMVT. At 4 months of age, the infant underwent surgical resection owing to an increased pressure gradient across the LVOT and ventricular septal thickening at the LVOT. This case highlights the diagnostic value of fetal echocardiography in identifying AMVT and the importance of regular postnatal follow-up.