A five-day-old, full term male infant was severely cyanotic at bih. His chest X ray showed ‘Egg-on -side’ appearance. Prostaglandin E1 was administered initially and later balloon atrial septosomy was done which showed improvement in oxygenation. The most likely diagnosis of this infant is:

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Vikas Bhardwaj
Medical Technologist, AIIMS New Delhi
Updated: Apr 17, 2026