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Abstract Background Patients can develop de novo malignancies following orthotopic heart transplantation. However, vascular tumors are not commonly described in this population. Case presentation We present a 69-year-old female with a history of orthotopic heart transplantation for chemotherapy-induced cardiomyopathy who developed an incidental pulmonary artery mass six years after her transplantation. Given concerns for malignancy, the patient underwent an operative excisional biopsy through a left anterior mini-thoracotomy with femoral artery and vein cannulation for cardiopulmonary bypass. The mass was determined to be a non-malignant vascular overgrowth with PIK3CA mutation. Conclusion We present the case of an unusual pulmonary artery mass with PIK3CA mutation found in a post heart transplant patient. We were able to spare her the morbidity of a redo-sternotomy by excising the mass via a minimally invasive left anterior thoracotomy approach.