Introduction:Necrotizing pneumonia(NP) is a serious complication of pneumonia characterized by destruction of normal lung parenchyma.

Aim:Our aim was to investigate factors that may affect the prognosis by examining the clinical findings and long-term pulmonary function tests(PFT) results.

Methods:Hospitalized pediatric patients between January 2016 and December 2022,diagnosed with NP included in this retrospective observational study in 8 pediatric pulmonology departments. Patients classified as their treatment options;antibiotics only,antibiotic+ thoracic tube (TT),antibiotic+TT+ fibrinolytic.PFTs were evaluated as 1-3months,3-6months and over 6months after discharge.

Results:Total of 62 children with NP and 54.8% (n=34)were male, mean age was 73 months.The average length of stay in hospital was 38.6±19.3 days in those who received antibiotic+TT, and 33.4±13.9 days in those who received additional fibrinolytic treatment while it was 24.5±9.46 days in children treated with antibiotics only(n=14)(p<0.05).There was no difference between clinical improvement and radiological recovery times with different treatment methods (p>0.05).19 patients performed PFT after discharge and in the period 1-3 months after discharge,28.6%(n=2)had restrictive,57.1%(n=4)had mixed,14.3%(n=1)had normal,while over 6months 20%(n=3)had restrictive,13%(n=2)had mixed,66.7%(n=10)had normal patterns.According to treatment differences,no significant difference was observed between the results of PFTs.

Conclusion:Children with NP who received only medical treatment had a shorter hospital stay than those who underwent surgical procedures.Most restrictive and mixed-type respiratory disorders returned to normal within 6months after discharge