Carcinoma, Small Cell

**Definition:** An anaplastic, highly malignant, and usually bronchogenic carcinoma composed of small ovoid cells with scanty neoplasm. It is characterized by a dominant, deeply basophilic nucleus, and absent or indistinct nucleoli. (From Stedman, 25th ed; Holland et al., Cancer Medicine, 3d ed, p1286-7)

**Tree numbers:** - C04.557.470.200.380

**Synonyms:** - Carcinoma, Oat Cell - Oat Cell Carcinoma - Small Cell Carcinoma