<prompt> Components of TOF are all exceptVSDSubpulmonary stenosisRight ventricular hyperophyPDA  <response>: Tetralogy of Fallot is the most common cause of cyanotic congenital hea disease and accounts for about 5 of all congenital cardiac malformations . The fourcardinal features are 1 VSD; 2right ventricular outflow tract obstruction subpulmonic stenosis; 3 overriding of the VSD by the aoa; and 4 right ventricular hyperophy . All of the features of tetralogy of Fallot result from anterosuperior displacement of the infundibular septum leading to abnormal septation between the pulmonary trunk and the aoic root. Robbins Basic pathology,9th edition.pg no.404 