Congenital cystic adenomatoid malformation
| Characteristics | Type 1 | Type 2 | Type 3 |
|---|---|---|---|
| Frequency | 6.5% | 2.5% | 10% |
| Associated anomalies | 8% | 56% | Nil |
| Cyst size (cm) | 3–10 | 0.5–3 | <0.5 |
| Predominant epithelium | Ciliated pseudostratified columnar | Ciliated columnar and cuboidal | Cuboidal (minimal ciliation) |
| Mucous cells | 32% | Nil | Nil |
| Cartilage | 10% | Nil | Nil |
| Striated muscle | Nil | 12% | Nil |
| Presence of intervening pulmonary parenchyma | Yes | Yes | No |
| Prognosis | Good | Good | Poor |