NODULAR
 | Lymphocytes predominate |
| Neutorophils predominate |
| Neutorophils, eosinophils, and plasma cells prominent |
| Eosinophils and plasma cells prominent |
| Histiocytes prodominate (figure) |
| Sarcoidal |
| Tuberculosis |
| Palisaded |
| Suppurative |
DIFFUSE
| Lymphocytes predominates |
| Neutorophils predominate |
| Neutorophils, eosinophils prominent |
| Plasma cells prominent |
| Mast cells predominate |
| Abnormal leukocytes |
| Histiocytes predominate |