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Table 2 Grading criteria for histological evaluation of the kidneys

From: Focused ultrasound to displace renal calculi: threshold for tissue injury

Score Description
0 No treatment associated lesions
1 Focal degenerative change including epithelial cell swelling, tissue hyperemia (congestion)
2 Degenerative change accompanied by focal regions of individual epithelial cell necrosis
3 Focal coagulative or liquefactive necrosis (emulsification) with hemorrhage
  1. Samples with scores of 1 and above were considered to be injured.