<prompt> Figure of 8 on chest X-ray is a sign associated with-Fallots tetralogyTAPVCTGAEbsteins anomaly  <response>: Ans. is b i.e., TAPVC Snowman or figure of 8 or Cottage loaf sign is seen in supracardiac TAPVC.Radiological features of Congenital heart diseasesVentricular septal defectVSD1 Small:- Normal chest x-ray2 Large :-a. Cardiomegalyb. Enlarged left atrium with widening of carina.c. Increased pulmonary vascularity pulmonary plethorad. Pulmonary edemae. Small aortic knobAtrial septal defect1 SmallNormal2 Largea. Mild cardiomegalyb. Normal or enlarged pulmonary arteryc. Increased pulmonary vascularity Pulmonary plethorad. Enlarged right atrium and right ventriclee. Left atrium is not enlarged in contrast to VSDf. Small aortic knobTransposition of greatArteries TGAa. Cardiomegaly Globular heartb. Egg on Side appearancec. Pulmonary plethorad. Absent thymic shadowTotal anamalous pulmonary venous connection TAPVCa. Cardiomegalyb. Pulmonary plethorac. Snowman or figure of 8 or Cottage loaf sign In supracardiac TAPVC,d. Ground glass lung in obstructive TAPVCTetralogy of Fallota. Boot shaped heart Coeur en Sabotb. Pulmonary oligemiac. Normal sized heart no cardiomegalyd. Right aortic arch in 25 casesPatient ductus arteriosus PDAa. Cardiomegalyb. Enlarged left atriumc. Increased pulmonary vascularity pulmonary plethorad. Pulmonary edemae. Prominent aortic knob in contrast to VSDf. Ductus bump due to enlarged PDA at the level of aortic knobCoarctation of Aorta CoAa. Reverse figure of 3 sign or double bulge sign or E sign on left border of aortic shadow is formed by above downward : - Prestenotic dilatation; coarctation itself indentation; poststenotic dilatation.b. Double aortic knucklec. Docks sign:- There is bilateral notching of inferior margins of 3-8 ribs. Rib notching is absent in the 1st 2nd ribs because first and second intercostal arteries do not take part in the collateral circulation. Rib notching increases with age and after the age of 7 years, rib notching is present in almost all the cases. 