Disease of external ear

Perichondritis of the pinna :-Its infection of auricular cartilage , which may lead to necrosis of cartilage and shrinkage (deformity), It may fallow :
Haematoma auris , Frost-bite , surgery on CSOM , Otitis extara.
Tretmeant :- 1-systemic antibiotic.
2-drainage with removal of necrotic cartilage .
3-plastic surgery for deformity of the auricle .

Neoplasm’s of the external ear :-
Benign –as
Exostosis:-defined as new bone formation projecting to the lumen of the bony canal
Clinical types sessile—most frequently seen usually bilateral and formed by ivory bone
Single pedenculated ----rare and usually unilateral formed of cancellous bone regard as true osteoma .
Diffused –generalized circular thickening of tympanic plate (hyperostosis)
Aetiology:-wetting and temp. Changes are probable cause so its more common in swimmers
c.p –irretation , deafness
tretemeant –aural toilet
surgical removal .
Malignant tumors of external auditory meats:-
Pathology –adenocarcinoma as ceruminoma