Radiologia Brasileira - Publicação Científica Oficial do Colégio Brasileiro de Radiologia

INTRODUCTION

The endoscopic placement of plastic biliary stents is a well-established technique for treating benign, malignant, or recurrent biliary obstructive disease^(1,2). Although the percutaneous transhepatic technique is a well-known means of inserting external drains and metallic biliary stents^(1,3–7), there has been only one study providing a technical description of the percutaneous transhepatic insertion of a plastic biliary stent, and the authors of that study employed a two-stage approach⁽¹⁾. To our knowledge, there have been no articles describing the technique in a single-stage approach and using a 10F biliary stent.


PROCEDURE

Preoperative images should be reviewed in detail for anatomical definition, possible anatomical variants, location of the point of obstruction, determination of the best positioning of the patient, and planning of the puncture site (the right or left hepatic duct).

With the patient under conscious sedation, local anesthesia (10 mL of 2% lidocaine) is administered at the point of percutaneous puncture. Percutaneous transhepatic puncture is then performed with a 17G × 10.6 cm coaxial needle (MCXS1816AX; Argon Medical Devices, Frisco, TX, USA) and a 5F vascular introducer (RS+A50K10SQ Radifocus Introducer II; Terumo, Tokyo, Japan), guided by ultrasound, through a peripheral branch of the bile duct. That is followed by cholangiography to visualize the exact location of the obstruction. A 0.035” hydrophilic guidewire and a 5F vertebral diagnostic catheter (IMPULSE; Boston Scientific, Marlborough, MA, USA) are then inserted, past the point of obstruction, until the distal end of the catheter is positioned inside the duodenum, preferably next to the ligament of Treitz (Figure 1). The entire duodenal lumen is then distended with approximately 25 mL of the iodinated contrast medium iodixanol (Visipaque; GE Health-care, Chicago, IL, USA) diluted in 100 mL of 0.9% saline solution (total volume, 125 mL), for better visualization of the duodenal lumen and for planning the insertion of the 10F × 12 cm plastic stent, previously assembled with the delivery system (Percuflex; Boston Scientific) to avoid improper positioning and iatrogenic lesions of the duodenal wall by the stent. The hydrophilic guidewire is replaced by a 0.035” rigid guidewire (Amplatz Super Stiff; Boston Scientific), and the diagnostic catheter is removed. Then the 5F introducer is replaced by an 11F vascular introducer (RS*A11K10SQ Radifocus Introducer II; Terumo) to feed in the 10F × 12 cm plastic stent.




The stent, together with the delivery system, is inserted over the guidewire through the sheath of the 11F introducer (Figure 2). Under fluoroscopy, we first seek to visualize and identify the two radiopaque marks, which are of utmost importance for the proper positioning of the plastic biliary stent. The distal radiopaque mark delimits one end of the delivery system at an estimated distance of 5 cm from the distal part of the stent (which will be inside the duodenum). The proximal radiopaque mark is 1.0 cm from the proximal portion of the plastic stent. The 11F introducer is pulled to a point at which the proximal portion of the stent is at an estimated distance of 3.0 cm above the bifurcation of the intrahepatic bile duct (in the direction of the puncture site), so as to correctly position that portion of the stent and confirm that it is not visible within the introducer. At this point, the rigid 0.035” guidewire is removed completely in order to improve the accommodation and anchoring of the distal portion of the stent inside the duodenum. The surgeon then releases the plastic stent by unscrewing the outer part of the delivery system (four turns) and removes it entirely (Figure 3). When the delivery system is being removed, the proper distal anchoring of the stent inside the duodenum and the proper positioning of its proximal end within the bile duct, should be confirmed by the radiopaque marking (Figure 4). After the stent delivery system has been removed, the stent can no longer be repositioned. As part of the protocol at our facility, a follow-up abdominal X-ray is taken 24 h after the procedure in order to verify that the intrabiliary contrast has been completely eliminated. In all cases of lesions suspected of malignancy, cholangiobiopsies are performed with the technique described by Nunes et al.⁽⁶⁾.








Percutaneous drainage via a plastic biliary stent is a technique that is easily performed, from a technical point of view. We believe it to be an extremely safe, affordable, and feasible option for the treatment of symptomatic obstructive jaundice in a variety of scenarios.


REFERENCES

1. Keshava SN, Mammen S. Percutaneous placement of a biliary plastic stent. Indian J Radiol Imaging. 2011;21:231–3.

2. Yoon WJ, Ryu JK, Yang KY, et al. A comparison of metal and plastic stents for the relief of jaundice in unresectable malignant biliary obstruction in Korea: an emphasis on cost-effectiveness in a country with a low ERCP cost. Gastointest Endosc. 2009;70:284–9.

3. Rossi P, Salvatori FM, Bezzi M, et al. Percutaneous management of benign biliary strictures with balloon dilation and self-expanding metallic stents. Cardiovasc Intervent Radiol. 1990;13:231–9.

4. Zurstrassen CE, Bitencourt AGV, Guimaraes MD, et al. Percutaneous stent placement for the treatment of malignant biliary obstruction: nitinol versus elgiloy stents. Radiol Bras. 2017;50:97–102.

5. Tibana TK, Grubert RM, Fornazari VAV, et al. The role of percutaneous transhepatic biliary biopsy in the diagnosis of patients with obstructive jaundice: an initial experience. Radiol Bras. 2019;52:222– 8.

6. Nunes TF, Tibana TK, Santos RFT, et al. Percutaneous transhepatic cholangiobiopsy. Radiol Bras. 2019;52:41–2.

7. Tibana TK, Grubert RM, Silva CMDR, et al. Percutaneous cholangioscopy for the treatment of choledocholithiasis. Radiol Bras. 2019;52:314–5.










1. Hospital Universitário Maria Aparecida Pedrossian da Universidade Federal de Mato Grosso do Sul (HUMAP-UFMS), Campo Grande, MS, Brazil
2. Escola Paulista de Medicina da Universidade Federal de São Paulo (EPM-Unifesp), São Paulo, SP, Brazil

Correspondence:

Dr. Thiago Franchi Nunes
Rua Doutor Antônio Arantes, 398, Chácara Cachoeira
Campo Grande, MS, Brazil, 79040-720
Email: thiagofranchinunes@gmail.com

a. https://orcid.org/0000-0003-0006-3725
b. https://orcid.org/0000-0002-8679-7369
c. https://orcid.org/0000-0001-5930-1383
d. https://orcid.org/0000-0001-8482-5955

Received 3 October 2019
Accepted after revision 13 November 2019

Publication date: 29/05/2020