MRI confirms a left-sided ureterocoele which descends through the urethra down into the vaginal introitus where it is manifest as a thin-walled blind ending cystic structure. This cystic structure contains a 7 mm calculus.
The urinary bladder is partially filled and the contralateral right ureter is not well demonstrated. The left ureter inserts slightly lower and more medially than expected, likely indicating an ectopic insertion close to the bladder neck. The urinary bladder is partially collapsed but otherwise normal.
The right distal ureter is normal in calibre and difficult to identify.
The right kidney is normal in size and appearance. The left kidney is slightly reduced in overall size with moderate dilatation of the renal pelvis up to 18 mm in AP diameter. Mild fullness of the upper pole central calyces is present. The lower pole calyces are essentially normal. Only a single left ureter is readily identified.
The vagina contains significant distension with fluid, perhaps representing vaginal secretions secondary to partial obstruction of the vaginal orifice by the cystic ureterocoele.
Anteverted uterus is normal in size for age and demonstrates low dependent layering T2 hypointense fluid-fluid interface, likely representing haemorrhage from current menstruation.