Acquired extra – cranial infection that causes aqueductal Stenosis is –
Aqueductal stenosis -
Causes of acquired aqueductal stenosis

Neonatal meningitis                       o Intrauterine viral infections
Subarachnoid hemorrhage              o Mumps meningoencephalitis
Bacterial endocarditis
Mumps
Measles
Staphylococcal septicemia