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Updated: Jul 2, 2026

Point-of-Care Kidney and Genitourinary Ultrasound in Adults: Image Acquisition
Published on: June 21, 2024
L-shaped cross-fused kidney with stone
Shiu-Dong Chung1, Shih-Chieh Chueh, Han-Sun Chiang
1Division of Urology, Department of Surgery, Far Eastern Memorial Hospital, Ban Ciao, Taipei, Taiwan.
L-shaped crossed renal ectopia, a rare congenital anomaly, presented uniquely with kidney and ureteral stones in an ectopic location. This case highlights unusual stone presentation in cross-fused ectopic kidneys, aiding diagnosis.
Area of Science:
- Urology
- Congenital Anomalies
- Medical Imaging
Background:
- L-shaped crossed renal ectopia is a rare congenital malformation.
- Ectopic kidneys can present with various complications, including urinary calculi.
- Accurate diagnosis relies on advanced imaging techniques.
Observation:
- A 58-year-old woman presented with symptoms suggestive of renal calculi.
- Imaging revealed a right-to-left cross-fused ectopic kidney, a specific type of L-shaped anomaly.
- Renal and ureteral stones were identified in an unusual location within the ectopic kidney.
Findings:
- Plain film radiography and reconstructive computed tomography (CT) demonstrated the unique stone location.
- The findings confirmed the presence of both renal and ureteral calculi in the context of crossed fused ectopia.
- This case illustrates a rare anatomical variant and its associated pathology.
Implications:
- Understanding rare congenital anomalies like L-shaped crossed renal ectopia is crucial for accurate diagnosis.
- Advanced imaging is vital for identifying unusual stone locations in ectopic kidneys.
- This case contributes to the literature on managing urinary calculi in complex renal malformations.
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