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Congenital Megacalyces and Megaureter
Alessandro Furlan, MD; Ghaneh Fananapazir, MD, FSAR, FSRU, FSABI
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KEY FACTS

  • Terminology

    • Imaging

      • Top Differential Diagnoses

        • Pathology

          • Clinical Issues

            TERMINOLOGY

            • Synonyms

              • Megacalyces = megacalycosis
            • Definitions

              • Megacalyces: Dilatation of calyces with normal-sized renal pelvis and ureter
              • Megaureter: Encompasses spectrum of anomalies that lead to enlarged ureter (diameter > 7 mm)
                • Primary megaureter: Results from functional or anatomic abnormality at ureterovesical junction
                • Secondary megaureter: Results from abnormalities that involve bladder or urethra

            IMAGING

            • Radiographic Findings

              • Ultrasonographic Findings

                • CT Findings

                  • MR Findings

                    • Nuclear Medicine Findings

                      • Imaging Recommendations

                        DIFFERENTIAL DIAGNOSIS

                          PATHOLOGY

                          • General Features

                            • Staging, Grading, & Classification

                              CLINICAL ISSUES

                              • Presentation

                                • Demographics

                                  • Natural History & Prognosis

                                    • Treatment

                                      Selected References

                                      1. Houat AP et al: Congenital anomalies of the upper urinary tract: a comprehensive review. Radiographics. 41(2):462-86, 2021
                                      2. Suzuki Y et al: Congenital megaureter. Rev Obstet Gynecol. 1(4):152-3, 2008
                                      3. Berrocal T et al: Anomalies of the distal ureter, bladder, and urethra in children: embryologic, radiologic, and pathologic features. Radiographics. 22(5):1139-64, 2002
                                      4. Shokeir AA et al: Primary megaureter: current trends in diagnosis and treatment. BJU Int. 86(7):861-8, 2000
                                      5. Rickwood AM et al: Natural history of obstructed and pseudo-obstructed megaureters detected by prenatal ultrasonography. Br J Urol. 70(3):322-5, 1992
                                      Related Anatomy
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                                      Related Differential Diagnoses
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                                      References
                                      Tables

                                      Tables

                                      KEY FACTS

                                      • Terminology

                                        • Imaging

                                          • Top Differential Diagnoses

                                            • Pathology

                                              • Clinical Issues

                                                TERMINOLOGY

                                                • Synonyms

                                                  • Megacalyces = megacalycosis
                                                • Definitions

                                                  • Megacalyces: Dilatation of calyces with normal-sized renal pelvis and ureter
                                                  • Megaureter: Encompasses spectrum of anomalies that lead to enlarged ureter (diameter > 7 mm)
                                                    • Primary megaureter: Results from functional or anatomic abnormality at ureterovesical junction
                                                    • Secondary megaureter: Results from abnormalities that involve bladder or urethra

                                                IMAGING

                                                • Radiographic Findings

                                                  • Ultrasonographic Findings

                                                    • CT Findings

                                                      • MR Findings

                                                        • Nuclear Medicine Findings

                                                          • Imaging Recommendations

                                                            DIFFERENTIAL DIAGNOSIS

                                                              PATHOLOGY

                                                              • General Features

                                                                • Staging, Grading, & Classification

                                                                  CLINICAL ISSUES

                                                                  • Presentation

                                                                    • Demographics

                                                                      • Natural History & Prognosis

                                                                        • Treatment

                                                                          Selected References

                                                                          1. Houat AP et al: Congenital anomalies of the upper urinary tract: a comprehensive review. Radiographics. 41(2):462-86, 2021
                                                                          2. Suzuki Y et al: Congenital megaureter. Rev Obstet Gynecol. 1(4):152-3, 2008
                                                                          3. Berrocal T et al: Anomalies of the distal ureter, bladder, and urethra in children: embryologic, radiologic, and pathologic features. Radiographics. 22(5):1139-64, 2002
                                                                          4. Shokeir AA et al: Primary megaureter: current trends in diagnosis and treatment. BJU Int. 86(7):861-8, 2000
                                                                          5. Rickwood AM et al: Natural history of obstructed and pseudo-obstructed megaureters detected by prenatal ultrasonography. Br J Urol. 70(3):322-5, 1992