Inclusion Criteria:  All individuals attending the Radiodiagnosis Department , who had paired posterior-anterior chest radiographs and RT-PCR nasopharyngeal swabs for COVID-19 at the time of initial attendance with moderate to advanced stage. The patients have positive finding in the posterior-anterior chest radiographs , multislice computer tomography and RT-PCR nasopharyngeal swabs for COVID-19. The patients with positive finding in the laboratory investigation (CBC, CRP ,ESR , S.Ferritin & D-Dimmer) . Patients with positive chest-CT finding and laboratory finding despite of having negative PCR swab  Exclusion Criteria:  Patients exceeding 30 days after positive RT-PCR . Patients diagnosed with mediastinal lymphadenopathy , masses ,Tree in bud appearance ,Pneumothorax. Or Cavitation.