Which malignant tumor is characterized by cystic masses and clear cytoplasm containing glycogen?

The malignant tumor that is characterized by cystic masses and clear cytoplasm containing glycogen is known as a clear cell tumor. This type of tumor is typically associated with certain organs, most notably the kidney and ovaries, and is recognized for its histological feature of clear cells. The clarity of the cytoplasm is due to the presence of glycogen and lipids, which cause the cells to appear empty or clear under the microscope when subjected to staining.

Clear cell tumors can be aggressive and are often diagnosed in advanced stages. Recognizing their distinct histopathological features, including the cystic nature and clear cytoplasm, is crucial for accurate diagnosis and appropriate management. As for the other options, they represent different types of tumors with unique features and cellular characteristics that do not align with the description of having cystic masses and clear glycogen-rich cytoplasm.