Pathological features
| Patterns | Solid: 36 (28.3%) |
| Acinar: 18 (14.2%) | |
| Fusocellular: 9 (7.1%) | |
| Tumour differentiation | Well differentiated: 21 (16.5%) |
| Moderately differentiated: 97 (76.4%) | |
| Poorly differentiated: 9 (7.1%) | |
| Pleural invasion | 4 (3.1%) |
| Angiolymphatic invasion | 11 (8.7%) |
| Bone metaplasia | 1 (0.8%) |
| Cellular pigmentation (melanin) | 1 (0.8%) |
| Immunohistochemistry | Synaptophysin: 33 (26.0%) |
| Chromogranin A: 34 (26.8%) | |
| Neuron-specific enolase: 20 (15.7%) |