A case of giant coronary artery aneurysm with fistulous connection to the pulmonary artery: a case report and review of the literature.

Giant coronary artery aneurysm is a rare condition with a reported prevalence of 0.02%. Herein, we report the case of a 79-year-old woman with a giant coronary aneurysm arising from a branch of the left anterior descending coronary artery that had a fistulous connection to the pulmonary artery. The aneurysm was removed and inflow and outflow arteries were closed surgically. Histology showed prominent mucinous degeneration and infiltration of inflammatory cells in the medial layer. After successful surgery, the patient was discharged uneventfully.