What exactly is a heart attack? Most heart attacks happen when a clot in the coronary artery blocks the supply of blood and oxygen to the heart. Often this leads to an irregular heartbeat-called an arrhythmia-that causes a severe decrease in the pumping function of the heart.
Oncocytoma can be described as a tumor that is mainly constituted out of oncocytes. These are actually epithelial cells, containing excessive quantities of mitochondria. This excess leads to a cytoplasm that is acidophilic and granular.
The oncocytes that contribute to the formation of oncocytoma are epithelial cells, as it was already mentioned. The composition of oncocytoma is what places it in the epithelial tumors category. The oncocytes are eosinophilic cells that are large in size, having a small and round nucleus.