The otopathology in the case of Alpo syndrome is:
The otopathology in AS is a defect in the cochlear basement membranes. Type IV collagen chains in the active tuning of the basilar and tectorial membrane which is an essential step in frequency discrimination and amplification of auditory signals are affected. Ref: Dan Med Bull 2009; 56:105-52
Defect in the cochlear basement membranes
Defect in conduction
Defect in the vestibulocochlear nerve
None of the above