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| Grade | Number of cases | Percentage (%) |
|---|---|---|
| Grade I: less than 5% solid growth pattern without nuclear atypia | 19 | 56 |
| Grade II: 6% to 50% solid growth pattern with mild to moderate nuclear atypia | 10 | 29 |
| Grade III: more than 50% solid growth pattern with severe nuclear atypia | 5 | 15 |
| Total | 34 | 100 |
