
1 Secretory otitis media (SOM)

2 1、Definition * SOM is a condition characterised by presence of non-purulent fluid in the middle ear. * synonyms:otitis media with effusion、 serous otitis media、mucoid otitis media、 catarrhal otitis media 、glue ear. *classification: acute and chronic. * commonly seen in children

3 2、Causes: several factors may be attributed to this: 1.insuffciency of eustachian tube: •mechanical obstruction:adenoid hyperplasia •non-mechanical obstruction: 2.viral infection: 3.allergy: 4.unresolved acute otitis media

4 中耳炎的病因、机理、分类与转归

5 adenoid hyperplasia Endoscopy X-ray

6 Carcinoma of the nasopharynx

7 Comparation of eustachian tube shorter, wider, more horizontal, straight children adult

8 3、clinical manifestation: symptoms: 1、hearing loss 2、earaches 3、tinnitus

9 Ear examination: 1、otoscopic findings: *the tympanic membrane is usually dull and retracted with loss of light reflex. *fluid filled in the middle ear:horizontal or cresentic line, bubbles, colour changed

10 The image of tympanic membrane Dull of tympanic membrane fluid filled in the middle ear