Bovine cardiac peripheral nerve sheath malignant tumor. Gross changes. (A) Cardiomegaly, with dorsal pulmonary compression. Enhanced liver with rounded edges and blue surface. (B) Large grayish-white neoplastic mass adhered to and infiltrating the right atrium. (C) Cut surface of the neoplastic mass bearing yellowish areas and hemorrhagic foci. (D) Multiple yellowish-white nodules adhered to the visceral pericardium from the left chambers and to the parietal pericardium.