A fetal echocardiography done at 22 weeks of gestation showed an unusual white ring-like structure which constricts both mid-ventricular cavities (Figure 1 and Supplementary Video 1). Both ventricular systolic and diastolic functions were within normal limits. After an uneventful pregnancy, the baby was born at 38⁺³ weeks of gestation with a birth weight of 3.3 kg. Echocardiography showed a pericardial fibrous band causing strangulation of both ventricles, extending from mid left ventricular lateral wall, diaphragmatic surface of both ventricles, lateral wall of right ventricle and into the right ventricular outflow track (Figures 2, 3, and Supplementary Video 2). A 3-dimensional cardiac computed tomography also showed the same findings (Figure 4). The baby was asymptomatic and discharged home 4 days after birth. At 20 months of age, the baby was still asymptomatic. Chest X-ray and electrocardiogram were unremarkable. Both ventricular global systolic functions looked normal on echocardiography. Mitral valve inflow Doppler early diastolic E velocity and late diastolic A velocity were 0.9 m/sec and 0.7 m/sec, respectively. Tricuspid annular plain systolic excursion was 15 mm. Tissue Doppler imaging showed decreased early diastolic E′ velocities of mitral and tricuspid annuli (Figure 5) along with mild dilatation of both atria, suggesting an early stage of ventricular diastolic dysfunction. This type of pericardial anomaly has not been reported, and the etiology and natural course are unknown. Close follow up is needed to assess ventricular functions and to decide necessity of any surgical intervention timely.4)