Consider the possibility of lung nodules or lung masses, etc.
A lung shadow is a dense area within the lung parenchyma found on fluoroscopy, which usually appears as a nodule or mass on CT or chest radiograph. Whether it is a lung nodule or a lung mass, the most common causes are infection, tuberculosis or tumour. The more common infectious lung diseases are pneumonia, pulmonary aspergillosis, tuberculosis, etc. Patients may have symptoms such as pain and coldness in the lungs. In addition, shadows in the lungs may also be due to lung masses or congenital developmental abnormalities, in which case further pathological examination is required.