6. Conclusion

B‐cell lymphoma remains a very rare cause of ureteral obstruction. Our case comprises part of the very limited data on urinary tract obstruction due to atypical malignancy. When evaluating recurrent or unexplained ureteral obstruction in a young patient, atypical malignancy such as ureteral lymphoma should be considered in the differential. It is vital to consider various uncommon or rare etiologies, especially when diagnostic work‐up is unrevealing in cases of obstruction within the urinary system. Histopathological evaluation is sometimes needed for proper diagnosis. Awareness of its diagnostic challenges and differentiating features from other common conditions can expedite early recognition of the disease and appropriate management.