Infarcted thymus presenting as cancer

Thymomas are exceedingly rare in the pediatric population, with lymphoma being a much more likely etiology of a mediastinal mass in a child. Here, we present the interesting case of a large mediastinal mass incidentally identified in an 11-year-old female, which was initially concerning for malignancy. After extensive workup revealing the likely benign nature off the lesion, resec-tion was pursued to relieve cardiopulmonary mass effect. Final pathology was returned as benign infarcted thymoma.