<prompt> Characteristic X-ray finding in ASD isEnlarged left atriaEnlarged left ventriclePAHPulmonary plethora  <response>: Description:can be normal in early stages when the ASD is small signs of increased pulmonary flow pulmonary plethora or shunt vascularity o enlarged pulmonary vessels o upper zone vascular prominence o vessels visible to the periphery of the film o eventual signs of pulmonary aerial hypeension chamber enlargement o right atrium o right ventricle o note: left atrium is normal in size unlike VSD or PDA o note: aoic arch is small to normal 