Hello Awesomites ! :D
There are different types of perforation of tympanic membrane. We name it on the basis of :-
1. Size of perforation
2. Site of perforation
So, let us begin.
ACCORDING TO SIZE OF PERFORATION,
1. Pinhole :- 1-2 mm in size.
2. Small :- Area involving one quadrant or <10% of pars tensa.
3. Medium :- Area involving 2-3 quadrant or 10-40% of pars tensa.
4. Subtotal :- Area involving the pars tensa >75% and does not involve the annulus.
5. Total :- A total perforation is present in tympanic membrane. Tympanic membrane is essentially absent and involve annulus also.
ACCORDING TO SITE OF PERFORATION,
1. Anterior
2.Posterior
3.Inferior
4.Central
OR,
1.Central :- A simple perforation in pars tensa with intact annulus.
Perforation is surrounded all around by pars tensa.
2. Marginal :- Perforation in the pars tensa surrounded partly by pars tensa and partly by bone.
3. Attic :- Perforation in pars flaccida.
I found this topic very confusing in my exams.
I hope it helped. :D
Have a great day ahead.
-Upasana Y. :)
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