| 1. Squamous
cell (epidermoid) carcinoma (25-40%) |
2. Adenocarcinomas
(25-40%)
Bronchial derived
Acinar; papillary; solid
Bronchioalveolar |
3. Small
cell carcinomas
Oat cell (lymphocyte like)
Intermediate (polygonal) |
4. Large
cell carcinomas
Undifferentiated; giant cell; clear cell |
A fifth category would include
tumors combining two or more histologic patterns. Typically it's
squamous
and adeno. |
Neuroendocrine tumors,
such as bronchial carcinoids, are considered a group by themsleves. |