The genesis and significance of epsilon waves still remains an enigma. In this case report, we document occurrence of epsilon waves in a neonate with left ventricular diverticulum and its disappearance after the surgical division of the diverticulum. We postulate that the presence of myocardial cells in the diverticulum was the cause for epsilon waves.

Hydatid cyst is an infectious disease that occurs in humans due to infection of Echinococcus granulosus larvae. Although cardiac hydatid cysts are rare, right atrial localisation is even rarer. The aim of this article is to emphasise the importance of always being alert and prepared for the risk of anaphylaxis developing due to cyst rupture in paediatric patients with isolated cardiac hydatid cysts, to initiate oral albendazole treatment immediately upon diagnosis, to underline the importance of surgical timing, and to discuss the role of clinical assessment and imaging methods in predicting of cyst rupture.

Since 2014, transcatheter paravalvular leak closure with the Occlutech Paravalvular Leak Device has been successfully accomplished in adults with high technical success. We describe the first successful use of the Occlutech Paravalvular Leak Device in the left atrio-ventricular valve in the United States in a 5-year-old child with a history of previously repaired atrio-ventricular septal defect.