| Subject | English | Spanish |
| med. | Duncan folds | pliegues de Duncan |
| med. | Duncan mechanism | mecanismo de Duncan |
| math. | Duncan's test | prueba de Duncan |
| med. | Duncan's ventricle fifth ventricle | ventrículo quinto (cavum septi pellucidi, camera septi pellucidi) |
| med. | Duncan's ventricle fifth ventricle | ventrículo de Vieussens (cavum septi pellucidi, camera septi pellucidi) |
| med. | Duncan's ventricle fifth ventricle | seudocele (cavum septi pellucidi, camera septi pellucidi) |
| med. | Duncan's ventricle fifth ventricle | cavidad del septum lucidum (cavum septi pellucidi, camera septi pellucidi) |
| med. | Duncan's ventricle fifth ventricle | ventrículo de Sylvio (cavum septi pellucidi, camera septi pellucidi) |
| med. | Duncan's ventricle fifth ventricle | ventrículo de Duncan (cavum septi pellucidi, camera septi pellucidi) |
| med. | Duncan's ventricle fifth ventricle | ventrículo de Aranzio (cavum septi pellucidi, camera septi pellucidi) |