title: Case 51-1978: distinguishing cystic from solid renal masses.
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D006801:Humans; D007680:Kidney Neoplasms / Q000175:diagnosis*; D008223:Lymphoma / Q000175:diagnosis*; D008297:Male; D007690:Polycystic Kidney Diseases / Q000175:diagnosis*; D014463:Ultrasonography