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Objective  To identify the pattern of the clinical, radiological, diagnostic procedures and loss to follow-up of the diagnosed cases of active tuberculosis (TB) adolescents.    Methods  This study was a retrospective analysis of the medical records of 143 adolescents aged 10 to 18 years with tuberculosis who were admitted TB wards of National Research Institute of Tuberculosis and Lung Disease (NRITLD) in Tehran, Iran, between March 2006 and March 2011.    Results  Of the 143 patients identified, 62.9% were females. Median age of the patients was 16 years. The contact source was identified in 47.5%. The most common presenting symptom was cough (86%). Isolated pulmonary TB (PTB) was detected in 113 patients (79%), 21 patients (14.7%) had extrapulmonary TB(EPTB), and 9 patients (6.3%) had PTB and EPTB. The most common site of EPTB was pleural (14%). The most common radiographic finding was infiltration (61%). Positive acid fast smears were seen in 67. 6 %. Positive cultures for  Mycobacterium tuberculosis  ( M. TB ) were seen in  44.7 %. Positive Polymerase chain reaction (PCR) results were seen in 60%. The adolescents aged 15 to 18 years were more likely to lose weight (p=0.001), smear positive (p=0.001), culture positive (p<0.001) and have positive PCR results (p=0.009). The type of TB (p=0.017) was a significant factor influencing loss to follow-up.    Conclusions  The study has revealed that the clinical and radiological findings of TB in adolescents are combination as identified in children and adults. The TB control programs should pay more attention to prevention and treatment of TB in adolescents.

FEATURES OF ADOLESCENTS TUBERCULOSIS AT A REFERRAL TB'S HOSPITAL IN TEHRAN, IRAN