PathWays Case Study: Dec. 19

A 51-year-old woman with a history of right coronary artery to coronary sinus fistula, associated with coronary sinus aneurysm, underwent surgical repair of such. A coronary sinus "thrombus" was removed during surgery and submitted for surgical pathology review. Grossly, the lesion consisted of tan-brown fibromembranous tissue measuring 3.6 cm in greatest dimension. Representative microscopic images (including relevant immunohistochemistry) are shown.

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Melanie Bois, M.D.
Fellow, Division of Cytopathology
Mayo Clinic
Joseph Maleszewski, M.D.

Consultant, Division of Anatomic Pathology
Mayo Clinic
Professor of Laboratory Medicine and Pathology
Mayo Clinic College of Medicine