Ureteral obstruction linked to degenerative sacroiliitis

CT identified an unusual cause of hydronephrosis despite stable renal function and no urinary symptoms.

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A 77-year-old woman with chronic lower back pain and no urinary symptoms had right hydronephrosis and hydroureter extending to the sacroiliac joint.
2

CT showed ureteral adherence and abrupt narrowing at the right sacroiliac joint, where advanced degenerative changes were more pronounced on the right.
3

The authors attributed the obstruction to nontraumatic ureteral entrapment from chronic degenerative sacroiliitis, with markedly delayed contrast excretion.
4

The patient was managed conservatively, and ultrasonography at 3 months showed no significant progression of hydronephrosis.
5

The authors noted that the single case, absent renal functional scan, and limited follow-up restrict conclusions about long-term renal outcomes.

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