What does left upper pneumonia mean?

Left upper pneumonic lesion is an imaging term that normally refers to a burned lung, inflammatory exudative lesion, and for this condition, pneumonia is most common. If the patient has an acute onset, associated symptoms such as cough, expectoration, and fever, and a chest CT showing a left upper pneumonic lesion, pneumonia is normally the disease. Other diseases such as tuberculosis, cryptogenic organizing pneumonia, which may present similar findings, and even pneumonic lung cancer, which may present on chest CT scans but may not respond to anti-infective therapy, may be confirmed by bronchofibroscopic lung biopsy or percutaneous lung biopsy, should be excluded.