Low-density foci may be benign or malignant, we cannot judge benign or malignant simply by low-density foci, we need to make a comprehensive judgment. Low-density foci do not represent malignant tumors, and cannot be judged as benign or malignant simply by high or low density, but need to be combined with the specific lesion site, morphology, size, physical examination and medical history for comprehensive evaluation. However, liquid hypodensity and fat hypodensity are generally more likely to be benign. The gold standard for determining the benign or malignant nature of low-density foci is pathological examination. If malignancy is suspected, pathological diagnosis is required to determine the benign or malignant nature of the lesion and then provide targeted treatment. If low density foci are found in the examination, it is recommended to improve further examination under the guidance of professional doctors to clarify the nature of the disease and actively treat it in order to avoid delaying the condition.