What does left kidney hypodense focus mean?

Low density lesion of left kidney refers to decreased echo and decreased density found in various imaging examinations of kidney, most of which are suggested by B-ultrasound, CT, MRI, etc. Under normal circumstances, the density is uniform when kidney disease does not occur, and local density changes will not be shown. If local density reduction is shown, it may indicate the presence of renal cyst, renal hamartoma, renal tumor, or focal ischemia of the kidney. These diseases will cause local low density lesions, and further enhanced CT or angiography is required to clarify the nature of the lesion. If the nature of the lesion is still unclear, renal biopsy is required if necessary. Therefore, hypodense lesions in the left kidney were found in various examinations, and it was suggested that further examination or puncture was needed to clarify the nature of the lesion and decide how to treat it later.