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
Houat AP et al: Congenital anomalies of the upper urinary tract: a comprehensive review. Radiographics. 41(2):462-86, 2021
Suzuki Y et al: Congenital megaureter. Rev Obstet Gynecol. 1(4):152-3, 2008
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
Shokeir AA et al: Primary megaureter: current trends in diagnosis and treatment. BJU Int. 86(7):861-8, 2000
Rickwood AM et al: Natural history of obstructed and pseudo-obstructed megaureters detected by prenatal ultrasonography. Br J Urol. 70(3):322-5, 1992
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References
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KEY FACTS
Terminology
Imaging
Top Differential Diagnoses
Pathology
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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
Houat AP et al: Congenital anomalies of the upper urinary tract: a comprehensive review. Radiographics. 41(2):462-86, 2021
Suzuki Y et al: Congenital megaureter. Rev Obstet Gynecol. 1(4):152-3, 2008
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
Shokeir AA et al: Primary megaureter: current trends in diagnosis and treatment. BJU Int. 86(7):861-8, 2000
Rickwood AM et al: Natural history of obstructed and pseudo-obstructed megaureters detected by prenatal ultrasonography. Br J Urol. 70(3):322-5, 1992
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