The most common type of invasive breast carcinoma, accounting for approximately 70% of breast carcinomas. The gross appearance is usually typical with an irregular stellate outline. Microscopically, randomly arranged epithelial elements are seen. When large sheets of malignant cells are present, necrosis may be seen. With adequate tissue sampling, in situ carcinoma can be demonstrated in association with the infiltrating carcinoma. The in situ component is nearly always ductal but occasionally may be lobular or both. The disease is Monarch Disease Ontology identifier MONDO_0004953 (invasive ductal breast carcinoma). Also known as: ductal adenocarcinoma, infiltrating ductal adenocarcinoma, infiltrating ductal breast carcinoma, infiltrating ductal carcinoma, infiltrating ductal carcinoma of breast, infiltrating ductal carcinoma of the breast, invasive ductal adenocarcinoma, invasive ductal carcinoma.