Monarch Disease Ontology identifier MONDO_0003424 (oncocytic adenoma) is a benign neoplasm composed of large cells with abundant eosinophilic granular cytoplasm. Representative examples include oncocytic adenomas of the thyroid gland, parathyroid gland, and pituitary gland. Also known as: follicular adenoma, oxyphilic cell, oncocytoma, oxyphilic adenoma.