Differential Diagnosis for Bilateral Lower Abdominal Pain with Mild Violation of the Left Renal Collecting System
Single Most Likely Diagnosis
- Urinary Tract Infection (UTI): Given the patient's age and sex, UTI is a common cause of abdominal pain and could lead to mild dilation of the renal collecting system due to inflammation and potential obstruction.
Other Likely Diagnoses
- Congenital Anomalies of the Kidney and Urinary Tract (CAKUT): Conditions such as ureteropelvic junction obstruction (UPJO) could cause dilation of the renal collecting system without the presence of kidney stones.
- Vesicoureteral Reflux (VUR): This condition, where urine flows backward from the bladder into the kidneys, can cause dilation of the renal collecting system and is a possible cause of abdominal pain.
- Pyelonephritis: An infection of the kidney that could cause inflammation leading to dilation of the collecting system.
Do Not Miss Diagnoses
- Tumor or Mass: Although rare, a tumor or mass in the urinary tract could cause obstruction leading to dilation of the renal collecting system. Early detection is crucial for treatment and prognosis.
- Trauma: Internal trauma could cause injury to the urinary tract, leading to dilation. Given the patient's age, accidental or non-accidental trauma should be considered.
- Ectopic Ureter: A congenital anomaly where the ureter does not connect correctly to the bladder, potentially causing obstruction and dilation.
Rare Diagnoses
- Prune Belly Syndrome: A rare congenital disorder characterized by the absence of abdominal muscles, undescended testes, and urinary tract anomalies, which could include dilation of the renal collecting system.
- Primary Megaureter: A rare condition where the ureter is dilated due to a functional obstruction, often without an anatomical blockage.
- Retroperitoneal Fibrosis: A rare condition where fibrotic tissue forms in the retroperitoneum and can encase and obstruct structures such as the ureters, leading to dilation of the renal collecting system.