Mastoid reservoir phenomenon is positive in:: (A) CSOM, (B) Petrositis, (C) Coalescent otitis media, (D) Coalescent mastoiditis
Answer is D. Mastoid reservoir phenomenon is the latent infection in the mastoid resulting from inadequate treatment of ASOM. (Also called as masked /latent mastoiditis). It is a slow process of destruction of mastoid air cells without acute features.