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Point-of-Care Ultrasound as a Diagnostic Tool for Nutcracker Syndrome in Pediatric Emergency Department/Cocuk Acil Serviste Nutcracker Sendromu icin Yol Gosterici Tanisal Arac Olarak Hasta Basi Ultrasonografi.

Introduction

Nutcracker syndrome (NCS) is defined as complex clinical symptoms related with left renal vein (LRV) compression. (1-4) As the symptoms are non-specific and it is difficult to diagnose NCS, the actual prevalence is unknown. (3) It usually presents with hematuria, abdominal pain, orthostatic proteinuria, varicocele, dyspareunia, dysmenorrhea. (2-4)

The diagnosis can be established based on clinical suspicion supported by radiological findings as the symptoms and signs of NCS are non-specific. It is essential to demonstrate the anatomical and pathophysiological features of NCS by ultrasound (US). (3-8) Here, we report a 15-year-old girl who presented with recurrent abdominal pain and was diagnosed with NCS by the guidance of point-of-care US (POCUS) in the emergency department.

Case

A 15-year-old girl was admitted to the pediatric emergency department with abdominal pain and bloating. She had multiple hospital admissions due to these complaints in the past 2 months. The pain was perceived at the left lower quadrant and spread to the left flank. She noticed that the pain was triggered by physical activity. She denied fever, vomiting, constipation, diarrhea, dyspepsia, dysuria, urine color changes and history of trauma. Abdominal pain was accompanied by anorexia and menstrual cycle irregularity. The vital signs were normal for her age. Physical examination revealed left costovertebral angle and mild left lower quadrant tenderness without guarding or rebound.

The levels of liver enzymes, creatinine and serum electrolytes were within the normal range. C-reactive protein was unremarkable and white blood cell count was 8.390/[micro]L. The hemoglobin level was 14 g/dL and platelet count was 213.000/[micro]L. There was no hematuria or proteinuria in urine analysis. A pediatric emergency medicine physician performed POCUS for suspected renal or pelvic disorder. There was no hydronephrosis, urolithiasis or free fluid in the pouch of Douglas. However, we observed an enlarged LRV with a diameter of 9.4 mm at the aortomesenteric junction and 1.8 mm at branching (Figure 1). Under the guidance of POCUS findings, Doppler US was performed by a radiologist for confirming the diagnosis of NCS. The narrowed aortomesenteric angle (AMA) was measured as 23 (Figure 2). Peak velocity (PV) was measured as 27 cm/s at the distended portion and 120 cm/s at the narrowed portion of the LRV. The measurements were repeated in the standing position; revealing 36 cm/s and 197 cm/s respectively. PV ratio was 4.4 in the supine position and 5.5 in the upright position. The diameter of the ovarian veins was normal.

Discussion

POCUS is used as a non-invasive tool for rapid assessment of abdominal pain in emergency setting. (9,10) Physicians should consider that it is a rule in technique and the most important part of an effective POCUS is to focus on the pre-diagnosis obtained from history and physical examination. (11) We performed POCUS with the pre-diagnosis of renal or pelvic disorder in a 15-year-old girl with recurrent abdominal pain, anorexia and menstrual cycle irregularity. However, we unexpectedly realized an enlarged LRV compared with the right renal vein and the patient was diagnosed as having NCS by Doppler US performed on account of the findings of POCUS.

NCS is characterized by complex clinical symptoms related with compression of the LRV. (1-4) It is also defined as "LRV entrapment syndrome" based on anatomical and physiologic features. The typical characteristic is anterior nutcracker which involves compression of the LRV by the forking of the aorta and superior mesenteric artery. Rarely, the retroaortic or circumaortic LRV is located between the vertebrae and aorta which is termed posterior nutcracker. (2-4)

LRV hypertension-related clinical symptoms are diverse and non-specific. (2,3,6,12) However, exacerbation by the long period of standing and walking is remarkable. (3,4,13) In retrospect our patient also had recurrent admissions with abdominal pain triggered by physical activity. The most common manifestations of NCS are hematuria and abdominal pain. (2,3) Collateral varices bleeding through adjacent renal calyces leads to hematuria. It can be presented by asymptomatic microscopic hematuria also macroscopic hematuria with consequent anemia. (3,4,14) Additionally, the blood clots moving through ureter can result in colicky left flank and abdominal pain. (3) The other reason for abdominal pain is gonadal vein syndrome related with pelvic venous congestion. It is the most serious manifestation of NCS presenting with dyspareunia, dysmenorrhea, dysuria in females; varicocele in males. (2,3,15,16)

The diagnosis of NCS depends on clinical suspicion and demonstration of the anatomic features by the imaging techniques. Recently, diagnostic tools, such as renal angiography, magnetic resonance imaging, magnetic resonance angiography and venography, have been replaced by US which is a rapid, reliable and non-invasive method. (3,4,17,18) On the other hand, effective interpretation of US measurements can be obtained by the knowledge of normal ranges. The AMA ranges between 25 and 100 in adults, but there is limited data in children. (1) Thus, the accurate scanning should include measurement of diameter and PV of LRV at the aortomesenteric and hilar portions and also collateral flow by Doppler US. (2,3,6-8,19,20) The cutoff value for diameter ratio ranges from 4.0 to 5.0 and PV ratio ranges from 4.1 to 5.0 in the literature. (5-7,19,20) The AMA in our patient was not significantly narrow with 23, but the PV ratio was 4.4 comparable with NCS.

The management of NCS depends on the severity of symptoms and US findings. Conservative approach can be preferred for mild symptoms in that spontaneous resolution by weight gain has been reported. (2,13) On the other hand, patients with severe and/or persistent symptoms should be treated by endovascular or surgical approaches. (2-4,21,22) Thus, we preferred to approach conservatively for our patient with mild symptoms.

In conclusion NCS is a rare and challenging cause of abdominal pain due to its non-specific clinical features and the lack of diagnostic criteria in children. We suggest that realizing the enlarged LRV by POCUS can provide a rapid diagnosis of NCS in the high suspicion of pediatric emergency physicians.

Ethics

Informed Consent: The written informed consent of patients father was taken.

Peer-review: Internally peer-reviewed.

Authorship Contributions

Surgical and Medical Practices: D.C., B.P., Concept: E.G.K., Design: T.C., Data Collection or Processing: H.A., Analysis or Interpretation: A.C., Literature Search: A.E., I.G., Writing: A.E.

Conflict of Interest: No conflict of interest was declared by the authors.

Financial Disclosure: The authors declared that this study received no financial support.

References

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iD Anil Er (1), iD Burak Polat (2), iD Duygu Cicek (3), iD Aykut Caglar (1), iD Elif Gokbike Koseli (3), iD Tanju Celik (3), iD Ilker Gunay (3), iD Hursit Apa (1)

(1) University of Health Sciences, Dr. Behcet Uz Child Disease and Pediatric Surgery Training and Research Hospital, Clinic of Pediatric Emergency, Izmir, Turkey

(2) University of Health Sciences, Dr. Behcet Uz Child Disease and Pediatric Surgery Training and Research Hospital, Clinic of Radiology, Izmir, Turkey

(3) University of Health Sciences, Dr. Behcet Uz Child Disease and Pediatric Surgery Training and Research Hospital, Clinic of Pediatrics, Izmir, Turkey

Address for Correspondence/Yazisma Adresi: Anil Er MD, University of Health Sciences, Dr. Behcet Uz Child Disease and Pediatric Surgery Training and Research Hospital, Clinic of Pediatric Emergency, Izmir, Turkey E-mail: anler.278@gmail.com ORCID ID: orcid.org/0000-0003-3452-5123

Received/Gelis Tarihi: 18.09.2017 Accepted/Kabul Tarihi: 31.10.2017

[c]Copyright 2018 by Society of Pediatric Emergency and Intensive Care Medicine Journal of Pediatric Emergency and Pediatric Intensive Care published by Galenos Yayinevi

DOI: 10.4274/cayd.80299
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Article Details
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Title Annotation:Case Report / Olgu Sunumu
Author:Er, Anil; Polat, Burak; Cicek, Duygu; Caglar, Aykut; Koseli, Elif Gokbike; Celik, Tanju; Gunay, Ilke
Publication:Journal of Pediatric Emergency and Intensive Care Medicine
Article Type:Clinical report
Geographic Code:7TURK
Date:Aug 1, 2018
Words:1884
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