Slightly low density nodule of the right kidney is a descriptor of an imaging test, which usually refers to renal cysts or renal tumors, etc., and requires prompt medical treatment once detected. Slightly hypodense nodules in the right kidney are nodular lesions of low density found on examination, such as renal cysts and renal tumors. Renal cysts may appear as unilateral or bilateral round or ovoid low-density shadows of varying sizes. Simple renal cysts usually have no obvious symptoms in the early stage, and may cause rupture and hemorrhage when the cyst grows to a certain extent. Renal tumors can also be manifested as slightly low density nodular shadow on imaging, for example, renal cell carcinoma can often be manifested as a homogeneous density shadow which is slightly lower or higher than the surrounding renal parenchyma. For patients with slightly low density nodule in right kidney, it is recommended to seek medical treatment in regular hospitals in time and follow the doctor’s instructions for examination and treatment.