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Table 2 Urinary tract dilatation grading system

From: Imaging of urinary tract in children in different clinical scenarios: a guide for general radiologists

Grading APRPD Central calyces Peripheral calyces Parenchymal thickness Parenchymal appearance Ureters Bladder Risk
Normal Less than 10 mm Normal Normal Normal Normal Normal Normal N/A
UTD P1 10–< 15 mm Dilated Normal Normal Normal Normal Normal Low
UTD P2 ≥ 15 mm Dilated Dilated Normal Normal Dilated Normal Intermediate
UTD P3 ≥ 15 mm Dilated Dilated Abnormal Abnormal Dilated Abnormal High
  1. APRPD anteroposterior renal pelvis diameter, UTD urinary tract dilatation