The difference between benign and malignant renal tumors includes the degree of differentiation, nuclear schizophrenia, growth rate and mode, whether there is a tendency of metastasis and recurrence. 1. Benign tumors: benign renal tumors have better differentiation, less heterogeneity, no or less nuclear schizophrenia, no pathological nuclear schizophrenia, slow growth rate, swelling or exogenous growth, no metastasis, little recurrence, and less harm to the organism. 2. Malignant tumor: it can show different degree of differentiation disorder or undifferentiated phenomenon, with large heterogeneity, pathological nuclear schizophrenia can be seen in pathological examination, with faster growth rate, which can show infiltrative growth or exophytic growth, and can recur and metastasize. Usually, benign tumors can be cured after surgical resection, while malignant tumors have a higher degree of recurrence, so it is necessary to go to the hospital regularly for rechecking after surgery to avoid tumor recurrence.