Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) nonsyndromic paraganglioma ?
    ### Response:
    Paraganglioma is a type of noncancerous (benign) tumor that occurs in structures called paraganglia. Paraganglia are groups of cells that are found near nerve cell bunches called ganglia. Paragangliomas are usually found in the head, neck, or torso. However, a type of paraganglioma known as pheochromocytoma develops in the adrenal glands.
    