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Titolo:
PERCUTANEOUS CHOLANGIOSCOPY IN OBSTRUCTED BILIARY METAL STENTS
Autore:
HAUSEGGER KA; MISCHINGER HJ; KARAIC R; KLEIN GE; KUGLER C; KERN R; UGGOWITZER M; SZOLAR D;
Indirizzi:
GRAZ UNIV,DEPT RADIOL,AUENBRUGGERPL 9 A-8036 GRAZ AUSTRIA
Titolo Testata:
Cardiovascular and interventional radiology
fascicolo: 3, volume: 20, anno: 1997,
pagine: 191 - 196
SICI:
0174-1551(1997)20:3<191:PCIOBM>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
ENDOPROSTHESIS; DRAINAGE;
Keywords:
BILE DUCTS, MALIGNANT AND BENIGN STRICTURES; INTERVENTIONAL PROCEDURES; STENTS AND PROSTHESES; ENDOSCOPY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
13
Recensione:
Indirizzi per estratti:
Citazione:
K.A. Hausegger et al., "PERCUTANEOUS CHOLANGIOSCOPY IN OBSTRUCTED BILIARY METAL STENTS", Cardiovascular and interventional radiology, 20(3), 1997, pp. 191-196

Abstract

Purpose: To reevaluate the reasons for the occlusion of self-expanding biliary metal stents, on the basis of cholangioscopic findings. Methods: Percutaneous transhepatic cholangioscopy (PTCS) was performed in 15 patients with obstructed biliary Wallstents. The reason for stent insertion was a malignant obstruction in 14 patients; 1 had a benign biliary stricture. Conventional noncovered stents had been inserted in 12 patients; in 3 cases a polyurethane-covered prototype Wallstent had been used. Stent occlusions occurred after 1-55 months. PTCS was performed with a 2.3-mm endoscope through an 11 Fr sheath. Biopsies were taken via the working channel of the endoscope. Results: In all patientswith noncovered stents the inner surface of the stent was highly irregular with seaweed-like protrusions (biopsy-proven granulation tissue). Stent incorporation varied from absent (n = 1) to subtotal (n = 8), but was always incomplete, no matter how long the stent had been in place. Tumor ingrowth was histologically proven in 2 patients. One patient had a large occluding concrement at the proximal end of the stent. In patients with covered stents, the inner surface appeared more regular; however, viable granulation tissue was found inside two stents andtumor ingrowth in one of them. Conclusion: PTCS showed that incorporation of the stent is virtually always incomplete. The factors contributing most to stent occlusion are the buildup of granulation tissue, bile sludge, and tumor overgrowth. Stone formation and tumor ingrowth can also be important, although less common causes of occlusion. A polyurethane stent covering could not prevent tumor ingrowth in one patientand the buildup of viable granulation tissue inside the stent in two further patients; mean stent patency in the three patients with such astent was 3 months.

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Documento generato il 28/11/20 alle ore 12:19:38