An atrial septal defect is the second most common congenital heart disease found in adults with a female to male ratio of 4 : 1. However. it is rare to have a complete absence of the interatrial septum (IAS) to be diagnosed in an elderly patient associated with other coexisting anomalies. We present a case of a 60-year-old female presenting with common atrium. https://pipingrockers.shop/product-category/methylcobalamin/