Clinical characteristics of 90 cases of Actinic Keratosis

Objective To study the clinical characters of actinic keratosis.Methods Descriptive epidemiological study was applied to analyze the cases from the dermatology outpatient clinic of the first affiliated hospital of Kunming Medical University form 1997 to 2008. The subjects were all Yunnan population. Excel and SPSS 10.0 were used for data analysis.Results A total of 790851 person-time of outpatient, 14550 biopsy examples and 90 cases of actinic keratosis had been epidermi ologically inestigated from 1997 to 2008. The average constituent ratio of actinic keratosis was 1.13/10 000,and the annual constituent ratio was 9.4/100 000.The onset of actinic keratosis increased with aging. There was a distinct characteristic of seasonal difference.The ratio of male/female was 1:1.5. The patients’ages ranged from 33 to 85 years old and the average was 65.94±10.46 years. 92.2% patients Presented the macules after 50 years old and more. The average of course of actinic keratosis was 2.6 years. The macules were located in face in 83 cases(93.3%), in the cheek in 44 cases(48.9%),2 cases(2.2%) had squamous cell carcinoma. The diagnostic accordance rate between clinic and pathology was only 42.2%. Conclusion The confirmed cases of actinic keratosis were slowly increasing. Actinic keratosis was most than in meles in females in Yunnan people. The misdiagnosis often happened in clinical works.