ArticleJACC. Case reports2026
Right Ventricular Apical Hypoplasia With a Novel Morphologic Presentation: The "Christmas Hat" Sign.
Article in JACC. Case reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
1 citing paper in PubMed.
- Ventricular Interdependence in Isolated Right Ventricular Hypoplasia.JACC. Case reports · 2026Article
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Authors and funding
7 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundRight ventricular apical hypoplasia is a rare congenital anomaly characterized by the failure of the right ventricular (RV) apical portion to develop. CASE SUMMARY: A 9-year-old boy presented with chronic cyanosis and digital clubbing. Multimodal imaging revealed a severely hypoplastic, dysplastic RV with lobulated contours. Cardiac magnetic resonance demonstrated a unique compensatory phenomenon, where the left ventricular apex was elongated and projected rightward, creating "Christmas hat" morphology. DISCUSSION: This case demonstrates a ventricular configuration that has not been previously described: a RV apical hypoplasia characterized by an elongated apical portion of the left ventricle. This elongation likely occurs in compensation for the apical agenesis of the RV. Identifying this "Christmas hat" sign could be helpful in diagnosing this rare form of RV hypoplasia. TAKE-HOME MESSAGE: Hypoplastic RV with elongation of the apical portion of the left ventricle toward the lateral wall of the RV, associated with an aneurysm of the interventricular septum, is described.
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