What does multiple millet-sized nodules in both lungs mean?

Multiple bilateral pulmonary micronodules refer to the presence of multiple small, grain-like nodular lesions detected in lung imaging examinations. This condition may be caused by various factors, primarily including: 1. Infectious causes: Infections of bronchioles or alveolar lobules by pathogens such as Streptococcus pneumoniae or influenza virus may lead to pneumonia, manifesting as multiple pulmonary micronodules. Infection with Mycobacterium tuberculosis may result in tuberculosis, which can also present as multiple bilateral pulmonary micronodules. 2. Non-infectious causes: Long-term inhalation of dust or harmful substances, or prolonged exposure to radiation therapy or chemotherapy, may induce pulmonary fibrotic changes, appearing as multiple nodules in the lungs. The severity of multiple bilateral pulmonary micronodules depends on their underlying cause and disease progression. If left untreated, they may cause significant damage to the lungs and affect the respiratory system. Once multiple bilateral pulmonary micronodules are detected, prompt medical evaluation is essential to determine the cause and initiate appropriate treatment.