Clinical Scorecard: Ureteral obstruction linked to degenerative sacroiliitis

At a Glance

Key Highlights

• Ultrasonography showed mild right hydronephrosis and upper ureteral dilation despite no hematuria, dysuria, or change in voiding frequency.
• CT intravenous pyelography showed hydroureter extending to the right sacroiliac joint, where the ureter was adherent and narrowed.
• No calculus, enhancing mass, extrinsic compression, or surrounding fibrosis was identified as the cause of obstruction.
• The patient was managed conservatively with close urologic surveillance; ultrasonography at 3 months showed no significant progression of hydronephrosis.
• The authors noted that the single case, declined renal functional scan, and short follow-up limit conclusions about long-term outcomes.

Guideline-Based Recommendations

Diagnosis

• In unexplained hydronephrosis, the authors suggest considering ureteral entrapment at the sacroiliac joint, particularly when degenerative joint changes are present.
• Trace the ureter across the degenerative joint space on imaging; in this case, CT intravenous pyelography included delayed images obtained 10 to 12 hours after contrast administration.

Management

• Management in the reported case was conservative because of advanced age, chronic obstruction, and relatively stable renal function.
• Previously reported nontraumatic cases received intervention: one patient underwent percutaneous nephrostomy for renal impairment, and another underwent ureteral excision with end-to-end anastomosis.

Monitoring & Follow-up

• The patient was placed under close urologic surveillance with periodic renal ultrasonography.
• At 3-month follow-up, ultrasonography showed no significant progression of hydronephrosis.

Risks

• The report describes significant obstructive uropathy, mild cortical thinning, and markedly delayed contrast excretion.
• Long-term renal outcomes with conservative management are uncertain because follow-up was limited and the patient declined a renal functional scan.

Patient & Prescribing Data

One 77-year-old woman with chronic lower back pain, no urinary symptoms, mild-to-moderate right hydronephrosis and hydroureter, and relatively stable renal function.

She declined a recommended renal functional scan and was managed conservatively with periodic renal ultrasonography. No medication regimen was reported.

Clinical Best Practices

• When evaluating unexplained hydronephrosis, assess the ureter's course where it crosses the sacroiliac joint, especially when imaging shows degenerative changes.
• Distinguish the site of mechanical obstruction from other ureteral findings: the authors considered proximal ureteral kinking at L3-L4 benign because it did not cause mechanical obstruction or proximal hydroureteronephrosis.
• Interpret conservative management outcomes cautiously because this report involved one patient and only 3 months of imaging follow-up.

Related Resources & Content

• Radiology Case Reports case report; article title provided in source