Nutcracker syndrome treatment: results from every published study

By the MALS Compass editorial teamPublished November 8, 2026Physician review: planned

In nutcracker syndrome the left renal vein, which drains the left kidney, is squeezed, usually between the aorta and the superior mesenteric artery. It can cause blood in the urine, flank or pelvic pain and enlarged pelvic veins. Treatments range from watchful waiting to stents and surgery that moves the vein. Each hospital publishes its own results. We read the abstracts of every nutcracker syndrome treatment study in PubMed and put the numbers side by side.

26studies of procedures that report a success rate

615patients in those studies

91%improved, weighted by study size

86-100%improved in the middle half of studies

What the numbers show

In published series of procedures, about nine in ten patients report that their symptoms resolved or improved.
Blood in the urine resolved in all patients in most studies that reported it; pain resolved or improved somewhat less often.
Stents placed inside the vein can move. Studies that reported it give a median of about 7% of stents migrating, which is why expert groups are cautious about them.
Some patients need a second procedure; the studies that report it give a median of about one in six.
Many patients, especially children, are first watched without a procedure, and symptoms settle in a part of them.
The studies are small and mostly from single hospitals. There are no trials comparing the procedures directly.

Table of Contents

Results by treatment

"Improved (weighted)" counts every patient once, so large studies count more. "Median study" is the middle value when studies are lined up from lowest to highest success. With so few studies per row, one hospital can move a number a lot.

Treatment	Studies with a rate	Patients	Improved (weighted)	Median study	Range
Stent inside the renal vein	4 of 7	82	97%	98%	90%-100%
External stent around the vein	6 of 8	148	94%	94%	67%-100%
Renal vein transposition, open	2 of 3	11	91%	94%	88%-100%
Kidney autotransplantation	1 of 5	34	90%	90%	90%-90%
Gonadal vein procedures	4 of 8	96	95%	98%	83%-100%
Several treatments	9 of 19	244	87%	90%	72%-100%
Observation and conservative care	2 of 3	143	47%	65%	40%-90%

An external stent is placed around the outside of the vein; an endovascular stent is placed inside it through a catheter. Renal vein transposition moves the vein to a new position on the vena cava. Patients who are observed are usually those with milder symptoms, so the rows are not a fair head-to-head comparison.

All studies

Filter by treatment or age group. Each title opens the study in PubMed. "Improved" is the share of treated patients whose symptoms resolved or improved, as that study defined it.

Treatment only studies with a success rate

Study	Year	Patients	Treatment	Improved	Follow-up
Laparoscopic Left Renal Vein Transposition for Nutcracker Syndrome: A Single-Center Case Series. Ann Vasc Surg · Poland	2026	9	Renal vein transposition, laparoscopic or robotic	-	-
Robotic left renal vein transposition for nutcracker syndrome: side-clamp to tailored reconstruction. BJU Int · China	2026	88	Several treatments	-	12 mo
Open surgery appears to be the preferred treatment in patients with nutcracker syndrome: A vascular low… J Vasc Surg Venous Lymphat Disord · USA	2026	250	Several treatments	-	-
The Value of Robotic-Assisted Combined Left Renal Vein and Proximal Gonadal Vein Transposition for Nutcracker Syndrome:… Int J Med Robot · China	2026	24	Several treatments	-	-
Stenting for symptomatic left renal vein compression in patients with complex pelvic venous disease is safe… J Vasc Surg Venous Lymphat Disord · USA · outcome: complete (24) or partial (15) symptom resolution	2026	43	Several treatments	91%	47 mo
Laparoscopic and robotic extravascular stenting of the left renal vein for anterior nutcracker syndrome in a… J Vasc Surg Venous Lymphat Disord · China · outcome: complete success	2026	22	External stent around the vein	82%	-
Robotic-assisted Kidney Autotransplantation for Nutcracker Syndrome: Surgical Technique and Results. Eur Urol · France · outcome: complete symptom relief (31%) or partial improvement (59%) among 29 with PROMs	2026	34	Kidney autotransplantation	90%	15 mo
Non-Right Renal Vein Occlusion: A Side Clamp Two-Step Technique for Robot-Assisted Laparoscopic Transposition of the Left… Int J Med Robot · China · outcome: symptoms resolved completely within 4 weeks	2025	3	Renal vein transposition, laparoscopic or robotic	-	-
Surgical treatment of nutcracker syndrome in Sub-Saharan Africa: Mid-term outcomes from a six-case series in Benin. Int J Surg Case Rep · Benin · outcome: complete resolution of symptoms	2025	6	Renal vein transposition, open	-	9 mo
Robotic-assisted left renal vein transposition with distal gonadal vein anastomosis: A novel technique for dual venous… J Vasc Surg Venous Lymphat Disord · China · outcome: hematuria, proteinuria and varicocele resolved within 6 months	2025	3	Several treatments	-	-
Surgical Options and Outcomes for Renal Vein Entrapment. Vasc Endovascular Surg · USA · outcome: symptoms resolved (43%) or improved (36%)	2025	53	Several treatments	79%	11 mo
Renal autotransplant as a definitive treatment for nutcracker syndrome: A multicenter retrospective study. J Vasc Surg Venous Lymphat Disord · USA	2025	105	Kidney autotransplantation	-	12 mo
Monocentric prospective study to valid multidisciplinary diagnostic and therapeutic approach for Nutcracker syndrome. Phlebology · France · outcome: all transposed patients reported improvement of symptoms at 2 months	2025	11	Several treatments	100%	2 mo
[MSB-31] Treatment of Nutcracker Syndrome: Outcomes with Left Renal Vein Transposition and Stenting. Turk Gogus Kalp Damar Cerrahisi Derg · Turkey	2024	20	Several treatments	-	-
Renal nutcracker syndrome presenting with varicocele: A case series. Int J Surg Case Rep · Iran	2024	4	Gonadal vein procedures	-	-
Outcomes of conservative management in patients with nutcracker syndrome. Phlebology · Turkey	2024	16	Observation and conservative care	-	27 mo
Treatment of Nutcracker Syndrome with Left Renal Vein Transposition and Endovascular Stenting. Ann Vasc Surg · Turkey	2024	19	Several treatments	-	23 mo
Patient-Reported Outcomes for Robot-Assisted Laparoscopic Extravascular Renal Vein Stent Placements for Nutcracker Syndrome. J Endourol · USA	2024	18	External stent around the vein	-	31 mo
Nutcracker syndrome in pediatrics: initial findings and long-term follow-up results. Pediatr Nephrol · Turkey · outcome: hematuria and/or proteinuria resolved under conservative follow-up	2024	123	Observation and conservative care	40%	36 mo
Surgical treatment of nutcracker syndrome results in improved pain and quality of life. J Vasc Nurs · USA	2023	5	Kidney autotransplantation	-	3 mo
Microvascular Doppler-assisted Microsurgical Left Spermatic-inferior Epigastric Vein Anastomosis for Treating Nutcracker Syndrome-associated Varicocele. Eur Urol Open Sci · China · outcome: all postoperative symptoms (hematuria/proteinuria, scrotal swelling, low back pain) disappeared	2023	13	Gonadal vein procedures	100%	-
Nutcracker Syndrome: Challenges in Diagnosis and Surgical Treatment. Ann Vasc Surg · Netherlands · outcome: symptoms related to NCS improved	2023	11	Several treatments	91%	-
Robotic assisted kidney auto-transplantation as a safe alternative for treatment of nutcracker syndrome and loin pain… Int J Med Robot · USA	2023	32	Kidney autotransplantation	-	11 mo
Laparoscopic placement of left renal vein extravascular stenting in treatment of nutcracker syndrome: Techniques and long-term… Int J Urol · China · outcome: complete symptom resolution (79%) or significant improvement (18%)	2023	76	External stent around the vein	97%	52 mo
Current results of left gonadal vein transposition to treat nutcracker syndrome. J Vasc Surg Venous Lymphat Disord · France	2021	11	Gonadal vein procedures	-	15 mo
Endovascular management of nutcracker syndrome in an adolescent patient population. Pediatr Radiol · USA · outcome: symptomatic resolution	2021	10	Stent inside the renal vein	90%	-
Gonadal vein transposition is a safe and effective treatment of nutcracker syndrome. J Vasc Surg Venous Lymphat Disord · USA · outcome: complete (11) or partial (4) symptom relief	2021	18	Gonadal vein procedures	83%	6 mo
3D-Printed PEEK Extravascular Stent in the Treatment of Nutcracker Syndrome: Imaging Evaluation and Short-Term Clinical Outcome. Front Bioeng Biotechnol · China · outcome: NCS symptoms resolved or improved without relapse	2020	28	External stent around the vein	100%	16 mo
Microsurgical gonadal-inferior epigastric vein anastomosis to treat the nutcracker phenomenon with left gonadal vein varices with… Int Urol Nephrol · China	2020	35	Gonadal vein procedures	-	12 mo
Robotic assisted extravascular stent placement for nutcracker phenomenon of the left renal vein: a case series. J Robot Surg · USA · outcome: immediate pain relief	2020	6	External stent around the vein	100%	-
Eighteen years of experience with pediatric nutcracker syndrome: the importance of the conservative approach. J Pediatr Urol · Spain · outcome: resolution of symptoms with conservative treatment	2020	21	Several treatments	76%	52 mo
Outcomes of left renal vein stenting in patients with nutcracker syndrome. J Vasc Surg Venous Lymphat Disord · USA · outcome: symptoms resolved or improved (9 complete, 4 partial)	2019	18	Several treatments	72%	41 mo
Ultrasound-assisted microsurgical left spermatic-inferior epigastric vein anastomosis for treating nutcracker syndrome-associated varicocele. Int Urol Nephrol · China · outcome: decrease in LRV peak flow and improvement in nutcracker syndrome	2019	53	Gonadal vein procedures	96%	-
A minimally invasive alternative for the treatment of nutcracker syndrome using individualized three-dimensional printed extravascular titanium… Chin Med J (Engl) · China	2019	17	External stent around the vein	-	-
Management of left renal vein compression in patients presenting left gonadal vein reflux. Phlebology · Spain	2018	462	Several treatments	-	60 mo
Stent migration after endovascular stenting in patients with nutcracker syndrome. J Vasc Surg Venous Lymphat Disord · China	2016	75	Stent inside the renal vein	-	55 mo
Treatment of nutcracker syndrome with open and endovascular interventions. J Vasc Surg Venous Lymphat Disord · USA · outcome: resolution of symptoms	2015	37	Several treatments	87%	37 mo
Laparoscopic Extravascular Stent Placement for Nutcracker Syndrome: A Report of 13 Cases. J Endourol · China · outcome: symptoms resolved (10) or improved (2)	2015	13	External stent around the vein	92%	33 mo
Microsurgical spermatic-inferior epigastric vein anastomosis for treating nutcracker syndrome-associated varicocele in infertile men: a preliminary experience. Urology · China	2014	5	Gonadal vein procedures	-	12 mo
Surgical management of nutcracker phenomenon presenting as left varicocele in adolescents: a novel approach. J Pediatr Urol · China · outcome: hematuria, proteinuria, scrotal discomfort and flank pain disappeared	2014	12	Gonadal vein procedures	100%	48 mo
Endovascular stent placement for nutcracker phenomenon. J Xray Sci Technol · China	2013	6	Stent inside the renal vein	-	-
Results of endovascular treatment for patients with nutcracker syndrome. J Vasc Surg · China · outcome: patients improved at 1 month; symptoms almost disappeared at 3 months	2012	30	Several treatments	100%	36 mo
Endovascular stenting for treatment of Nutcracker syndrome: report of 61 cases with long-term followup. J Urol · China · outcome: symptoms resolved or improved (cumulative at 1 week, 1 and 6 months)	2011	61	Stent inside the renal vein	97%	66 mo
Laparoscopic extravascular renal vein stent placement for nutcracker syndrome. J Endourol · China · outcome: total relief without relapse and normal urine tests	2010	3	External stent around the vein	67%	25 mo
The role of renal autotransplantation in treatment of nutcracker syndrome. Saudi J Kidney Dis Transpl · Iran	2010	4	Kidney autotransplantation	-	-
Left renal vein transposition for nutcracker syndrome. J Vasc Surg · USA	2009	11	Several treatments	-	39 mo
Diagnosis and surgical treatment of nutcracker syndrome: a single-center experience. Urology · China	2009	7	Several treatments	-	43 mo
The left renal entrapment syndrome: diagnosis and treatment. Ann Vasc Surg · China · outcome: normal urine test and symptoms disappeared	2007	20	Several treatments	90%	-
From the nutcracker-phenomenon of the left renal vein to the midline congestion syndrome as a cause… Med Hypotheses · Germany · outcome: complete relief of therapy-resistant midline symptoms after acetylsalicylic acid	2007	16	Other	-	-
Endovascular stent placement for the treatment of nutcracker phenomenon in three pediatric patients. J Vasc Interv Radiol · China	2005	3	Stent inside the renal vein	-	-
Endovascular stenting in the treatment of pelvic vein congestion caused by nutcracker syndrome: lessons learned from… J Vasc Surg · France · outcome: all improved at one month	2005	5	Stent inside the renal vein	100%	14 mo
Factors affecting spontaneous resolution of hematuria in childhood nutcracker syndrome. Pediatr Nephrol · Korea · outcome: hematuria disappeared or improved on follow-up (observation)	2005	20	Observation and conservative care	90%	17 mo
Treatment of six cases of left renal nutcracker phenomenon: surgery and endografting. Chin Med J (Engl) · China · outcome: relieved of LRV compression with improved symptoms and normal urine tests	2003	6	Stent inside the renal vein	100%	-
Transposition of the left renal vein for treatment of the nutcracker phenomenon: long-term follow-up. Urology · Germany · outcome: symptoms related to nutcracker efficiently relieved	2002	8	Renal vein transposition, open	88%	66 mo
The nutcracker syndrome: its role in the pelvic venous disorders. J Vasc Surg · USA	2001	6	Several treatments	-	36 mo
The nutcracker syndrome: an uncommon cause of haematuria. Br J Urol · UK · outcome: haematuria ceased or improved	1994	5	Other	100%	-
Left renal venous hypertension "nutcracker" syndrome. Managed by direct renocaval reimplantation. Urology · outcome: asymptomatic one to four years after surgery	1982	3	Renal vein transposition, open	100%	-

Extracted by our editors from the PubMed abstracts of 194 nutcracker syndrome papers screened (63 report treatment outcomes), built November 8, 2026. Every number was checked against a verbatim quote from the abstract.

How we built this

We searched PubMed for nutcracker syndrome and nutcracker phenomenon, and screened every paper with an abstract that mentions treatment and is not a single case report.
For each study we recorded the number of treated patients, age group, treatment, follow-up, the share who improved, resolution of blood in the urine and of pain, complications, stent migration and repeat procedures, only as stated in the abstract.
Every number is stored with the exact sentence from the abstract that supports it, and a script checks that the sentence and the number are really there. Where an abstract gave several counts that had to be added up, our editors checked the sum by hand; each decision is documented.
Systematic reviews are listed in PubMed but not added to the totals, to avoid counting the same patients twice.

Limitations

Nutcracker syndrome is uncommon and most studies are small case series, so the numbers are uncertain.
Abstracts are short; full papers may contain details we did not capture.
Studies define success differently and follow patients for different lengths of time; stent problems can appear years later.
Hospitals with good results are more likely to publish, so real-world results may be lower.
A compressed renal vein on a scan is common without symptoms. These results apply to patients whose symptoms were judged to come from the compression.

Questions to ask about treatment

How sure are you that the vein compression, and not another condition, causes my symptoms?
Can we watch and wait first, and what would make a procedure necessary?
Which procedure do you recommend, why, and how many have you done?
If a stent is used, what is the risk that it moves, and how would it be checked?
Do I also have pelvic congestion or SMA syndrome that should be treated?

Read our guide to nutcracker syndrome, and see results for pelvic congestion treatment and SMA syndrome treatment.

MALS Compass is an independent educational website, not a medical provider, and is not affiliated with any hospital, clinic or university. This page is educational information and does not replace advice from your own doctor. For any question about your health, please contact your doctor or an official healthcare institution.