Table 1.

Clinical details of the 9 patients with supernumerary kidneys

No.	Age group	Initial reason for radiological examination	Referred to radiology by?	Initial modality	Additional modalities	Correctly diagnosed	Initial diagnosis reported	Initial diagnosis to surgery	Patient management
1	Adult	Pneumonia and gastrointestinal bleeding	Pulmonology	CT	2 CT scans 1 Cystography	Yes	SK; diagnosis rejected 12 years later. DD: “tumor”	12 years	Watch-and-wait surgery 12 years later together with prostatectomy
2	Adult	Liver cirrhosis	Gastroenterology	CT	7 CT scans 1 MR scan	No	Described, but without diagnosis or interpretation	–	No consequence
3	Adult	Uterine Carcinoma	Gynecology	CT	3 CT scans 6 US exams	No	Metastasis of the adrenal gland	–	No consequence
4	Adult	Urinary tract infections	Surgery	CT	5 CT scans 4 US exam 2 Cystographies 3 MR scans	No	Abscess	2 days	Series of operations. Complications: urinary leakage; fistula to rectum and urine bladder
5	Adult	Lumbalgia	GP	CT	–	No	Recurrence of a presumably resected tumor	–	Watch-and-wait
6	Child	Lower abdominal pain	Pediatrics	US	1 CT 2 US exam 1 MR scan	Yes	SK	11 years	Resection of the hydronephrotic SK and ureter; shrunken IK remained in situ
7	Adult	Tumor palpated	Gastroenterology	CT	6 MR scans	No	Mesenterial cyst or lymphocele	–	No consequence
8	Adult	Aortic dissection	Surgery	CT	2 CT scans 1 US exam	No	Described, but without diagnosis or interpretation	–	No consequence
9	Adolescent	Inguinal hernia and pain	Surgery	US	2 US exams 1 Cystography 1 Urography 1 MR scan	No	Megaureter or cyst	17 years	Resection

Abbreviations: DD Differential diagnosis, IK Ipsilateral kidney, SK Supernumerary kidney, UF Ureter fissus, US Ultrasound