Chronic inflammatory fibrous focus in the left lower lobe

We have all heard of pneumonia and lung diseases in our daily lives, but few people have heard of chronic inflammatory fibrosis in the left lower lobe of the lung. Chronic inflammatory diseases like this are caused by long-term infection of the lung function. If it is not completely eradicated, it will cause these chronic problems over time. As a patient, you need to pay attention to treatment in your daily life.

Pulmonary fibrosis is often the fibrotic lesion left over after natural healing of lung infection. The interstitial tissue of the lung is composed of collagen, elastin and protein sugars. When fibroblasts are damaged chemically or physically, they will secrete collagen to repair the interstitial tissue of the lung, thereby causing pulmonary fibrosis; that is, the result of the body's repair after the lungs are damaged.

Common causes include recovery from tuberculosis or other signs of recovery from injury. If the scope of fibrosis is small, it will have little effect on the body. If the scope is wide, it may lead to reduced lung function, hypoxia and difficulty breathing. Normal lung interstitium is composed of a small number of interstitial macrophages, fibroblasts, myofibroblasts, as well as lung matrix, collagen, macromolecules, non-collagenous proteins, etc. When pulmonary interstitium is diseased, the quantity and properties of the above components will change. It is manifested by obvious inflammation invading the alveolar wall and adjacent alveolar wall cavity, type II alveolar epithelial cells replacing type I alveolar epithelial cells, obvious thickening of the alveolar septum and pulmonary fibrosis, and finally loss of pulmonary capillaries.

Disease

Alveolitis appears in the early stage, with serous and cellular components in the alveoli, a large number of monocytes, some lymphocytes, plasma cells, alveolar macrophages and other inflammatory cells infiltrating in the pulmonary interstitium, and the alveolar structure is intact. In the late stage, chronic inflammation has been alleviated, the alveolar structure is replaced by solid collagen, the alveolar wall is destroyed, and an expanded honeycomb lung is formed. Collagen, extracellular matrix, and fibroblasts are distributed in the interstitium, and the alveolar epithelium metaplasias into squamous epithelium. Based on the above pathological changes, clinical manifestations are mostly progressive dyspnea or irritating dry cough. Chest X-ray shows reticular shadows in both middle and lower lung fields, and lung function is restrictive ventilation dysfunction. The disease continued to progress and eventually the patient died of respiratory failure.