A: The cardiac myxoma was diagnosed at the same time as the fibrolamellar carcinoma in this case and shows neoplastic cells characterized by spindle cytoplasmic projections that imparted a spider-like appearance
B: Calretinin was positive in the spindle shaped neoplastic cells, as expected for the diagnosis of cardiac myxoma
C: PRKAR1A expression was absent in the neoplastic cells. Inflammatory cells and cardiac muscle served as positive internal controls.