High-density shadow may be solid lesions, or it may be caused by calcified foci, congestion, etc. It is recommended to consult a doctor for clarification in time. 1. Solid lesions: High-density shadow is the description of lesions in MRI, ultrasound, CT and other imaging examinations. High-density shadow may be solid tumor, nodule, tuberculosis mass, but no matter whether the solid lesion is benign or malignant, it is recommended to do pathological examination to confirm the diagnosis. 2. Calcified foci: it refers to calcium deposits similar to stones in the imaging examination. Generally, calcified foci can be called dense or high-density shadows, while calcified foci do not belong to solid nodules. 3. Congestion: high-density shadow can also be seen in newly formed blood clots, congestion, such as non-inflammatory pleural congestion, pleural changes, etc. can also be manifested as high-density shadow. If the hyperdense shadow is caused by congestion, it is not a solid lesion. The presence of the above factors should lead to prompt medical attention and a definitive diagnosis.