Carcinoma, Medullary

**Definition:** A carcinoma composed mainly of epithelial elements with little or no stroma. Medullary carcinomas of the breast constitute 5%-7% of all mammary carcinomas; medullary carcinomas of the thyroid comprise 3%-10% of all thyroid malignancies. (From Dorland, 27th ed; DeVita Jr et al., Cancer: Principles & Practice of Oncology, 3d ed, p1141; Segen, Dictionary of Modern Medicine, 1992)

**Tree numbers:** - C04.557.465.625.650.240.315 - C04.557.470.200.025.370.315 - C04.557.470.615.315 - C04.557.580.625.650.240.315