Although the prevalence and risk factors vary according to time, place, and diagnostic criteria, periodic epidemiological study on CRS is necessary to reduce socioeconomic expenditure and establish an improved national health care policy.

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1b.

TPFL is a feasible implant material that delivers suitable augmentation and patient satisfaction with minimal morbidity in both primary and revision rhinoplasty.

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The clinical features of paediatric chronic sinusitis differed between the younger and older groups. Symptomatic, anatomical and clinical differences between these two groups suggest that further study of paediatric chronic sinusitis should stratify patients by age to better understand the effects of treatment on each age group.

Sebaceous trichofolliculoma is a rare benign tumor and represents a variant of trichofolliculoma. Up to now, only 5 cases of sebaceous trichofolliculoma were reported in Korea. It generally presents as a centrally depressed solitary tumor and occurs in areas rich in sebaceous lobules. Microscopically, it shows cystic cavities with or without keratin-filled portion and sebaceous lobules. The lobules are connected to the cystic wall. We report a case of infected sebaceous trichofolliculoma on the right cheek accompanied by a unilateral microtia in a 16year-old man. The patient was treated with oral antibiotics and surgical excision. By summarizing 12 past cases, 6 Korean and 7 international, we have put together clinical features of Sebaceous trichofolliculoma.