A Case of Chronic Expanding Hematoma Presenting as a Subcutaneous Mass 24 Years after Konno Procedure

Here, we report a very rare case of chronic expanding hematoma presenting as a gradually enlarging subcutaneous pulsatile mass detected 24 years after a Konno procedure.

A 37-year-old man, who had undergone a Konno procedure at the age of 13 for severe aortic stenosis caused by a bicuspid aortic valve, presented with a pulsatile subcutaneous mass that had gradually increased in size over a 4-month period. CT revealed a large mediastinal mass compressing the right ventricular outflow tract, and a transthoracic echocardiogram showed an elevated pressure gradient between the right ventricle and pulmonary artery. Surgical resection of the mass and reconstruction of the right ventricular outflow tract were performed. The mass was completely excised, and the outflow tract was reconstructed using a short valved composite graft. The patient had an uneventful postoperative course.

This case underscores the importance of considering chronic expanding hematoma in the differential diagnosis of new pulsatile masses in patients with a history of cardiac surgery and demonstrates that timely surgical intervention can be performed safely and effectively.