The presence of high-density shadows in the left upper lung is a pathological manifestation found by taking x-rays or CT or even MRI of both lungs, or even imaging of the lungs, most often as a result of inflammation of the lungs. For example, it is common to see bacterial pneumonia due to a decrease in resistance and bacterial infection of the left upper lung area of the lung mucosa. Also seen are specific pathogens such as fungal and Mycobacterium tuberculosis infections causing inflammation of the upper left lung, and less commonly, malignant occupying lesions of the upper left lung, such as carcinoma of the upper left lung. If necessary, respiratory secretions can be taken and pathogen culture and drug sensitivity test can be done to clarify the cause and condition, and high-density biopsies can be taken by bronchial fiber endoscopy and pathological examination can be done to clarify the nature of the carcinoma.