This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other hea diseases in children, Subject name: Pediatrics
A 2-month-old baby with central cyanosis presented with the following findings on chest X-ray & ECG. What is the most probable underlying diagnosis? 
Select and explain. 
A. Tetralogy of Fallot, B. Hypoplastic left hea syndrome, C. Coarctation of aoa, D. Ebstein anomaly
D: Ebstein anomaly
Answer: D: Ebstein anomaly 
Explanation: - Given ECG is showing Himalayan P waves & x-ray is showing Box shaped hea - features of Ebstein anomaly. EBSTEIN ANOMALY: - Downward displacement of posterior & septal leaflets of Tricuspid valve resulting in atrialization of right ventricle. - Huge cardiomegaly, especially of Rt atrium is seen - ECG : very tall & broad P waves seen d/t enlarged atria. These P waves look like a mountain; hence called 'Himalayan' p waves