Otosclerosis or Otospongiosis is primary disease of bony labyrinth or the inner ear. The irregularly laid spongy bone replace the normal enchondral layer of bony otic capsule. It is made from two words- Oto- Ear and Sclerosis- Hardening of tissue.
Atticoantral CSOM is Unsafe type of CSOM against Tubotypanic CSOM, which is safe type. Read the clinical notes and review Bridgin gap of Cholesteatoma, Perforation in Atticoantral CSOM, Difference between Canal wall up vs Canal wall down procedures (surgical).
Tubotympanic CSOM is Safe type of CSOM against Atticoantral CSOM, which is unsafe type. Read the clinical notes and review what is shielding effect in Tubotypmanic Chronic Suppurative Otitis Media and Central Perforation in benign type of CSOM.