What are Major aorto pulmonary collateral arteries (MAPCAs)?
MAPCAs stands for major aorto pulmonary collateral arteries. These can arise when there is compromise of pulmonary blood flow in CHD, often tetralogy of Fallot or pulmonary atresia with ventricular septal defect. CT or MRI may identify suspected MAPCAs arising from the aorta to supply the lungs.
Unrestricted MAPCAs may lead to pulmonary congestion and heart failure. Treatment may include “unifocalization,” which includes detachment of the origins of MAPCAs and reanastomosis to the central pulmonary arteries.