Pancreatic ductal adenocarcinoma : computed tomography for diagnosis, local staging and prediction of postoperative complications
Author: Loizou, Louiza
Date: 2015-06-05
Location: Hörsalen Novum, KI Campus Huddinge
Time: 09.00
Department: Inst för klinisk vetenskap, intervention och teknik / Dept of Clinical Science, Intervention and Technology
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is a disease with a dismal prognosis, being the 4th
leading cause of cancer deaths in Sweden and worldwide. The only potentially curative
therapy is surgery. Unfortunately, by the time of diagnosis only 20% of patients have a
resectable tumor and the overall 5-year survival rate does not exceed 5%. One of the main
reasons for this is that some tumors are not detected, either because of small size or difficulty
in delineation. Another reason is the underestimation or in some cases overestimation of the
local tumor staging. These patients undergo an extensive but unnecessary operation or are
withheld from potentially curative surgery, respectively. In some cases the patients develop
serious postoperative complications, which can be predicted and perhaps avoided with proper
preoperative planning. Technological advances in multidetector computed tomography
(MDCT), combined with its wide availability, have made MDCT the modality of choice for
PDAC imaging.
The overall purpose of this thesis was to investigate the role of MDCT in patients with PDAC in terms of (i) tumor diagnosis, (ii) local staging assessment and (iii) prediction of postoperative complications.
In Study I, we compared low-tube-voltage (80 kV) with normal-tube-voltage (120 kV) protocols regarding tumor detection by using a phantom that simulated the normal pancreatic parenchyma and hypovascular tumors. Our results showed that low tube-voltage significantly improves tumor detection.
In Study II, we evaluated 30 MDCT examinations of the pancreas in patients with PDAC in the pancreatic head, obtained according to our institution’s standard protocol (120 kV and 0.75 g iodine (I)/kg body-weight). Based on our hospital’s classification system, we investigated the interobserver agreement among radiologists in local tumor staging assessment and the correlation of this assessment to the surgical outcome. Our results showed almost perfect agreement among radiologists as well as an increased risk for vascular involvement with more advanced preoperative staging. In Study III, we compared low-tube-voltage normal-iodine-load (80 kV and 0.75gI) with low-tube-voltage high-iodine-load (80 kV and 1gI) and with normal-tube-voltage normaliodine- load (120 kV and 0.75gI) protocols in 30 patients with PDAC, regarding tumor conspicuity and local vessel involvement. Our results showed that low tube-voltage and high iodine-load significantly improve tumor conspicuity. In Study IV, we correlated the pancreatic remnant volume (PRV) and pancreatic duct width (PDW) in 182 patients undergoing pancreaticoduodenectomy (PDE), to the risk for pancreatic leakage and fistula (PF) formation. Our results showed a significantly higher risk for PF in patients with high PRV and/or small PDW.
In conclusion, a high-quality preoperative MDCT is a very useful tool in the evaluation of PDAC in terms of tumor diagnosis, staging and prediction of postoperative complications. The low-tube-voltage high-iodine-load technique has the potential to improve tumor diagnosis and local staging.
The overall purpose of this thesis was to investigate the role of MDCT in patients with PDAC in terms of (i) tumor diagnosis, (ii) local staging assessment and (iii) prediction of postoperative complications.
In Study I, we compared low-tube-voltage (80 kV) with normal-tube-voltage (120 kV) protocols regarding tumor detection by using a phantom that simulated the normal pancreatic parenchyma and hypovascular tumors. Our results showed that low tube-voltage significantly improves tumor detection.
In Study II, we evaluated 30 MDCT examinations of the pancreas in patients with PDAC in the pancreatic head, obtained according to our institution’s standard protocol (120 kV and 0.75 g iodine (I)/kg body-weight). Based on our hospital’s classification system, we investigated the interobserver agreement among radiologists in local tumor staging assessment and the correlation of this assessment to the surgical outcome. Our results showed almost perfect agreement among radiologists as well as an increased risk for vascular involvement with more advanced preoperative staging. In Study III, we compared low-tube-voltage normal-iodine-load (80 kV and 0.75gI) with low-tube-voltage high-iodine-load (80 kV and 1gI) and with normal-tube-voltage normaliodine- load (120 kV and 0.75gI) protocols in 30 patients with PDAC, regarding tumor conspicuity and local vessel involvement. Our results showed that low tube-voltage and high iodine-load significantly improve tumor conspicuity. In Study IV, we correlated the pancreatic remnant volume (PRV) and pancreatic duct width (PDW) in 182 patients undergoing pancreaticoduodenectomy (PDE), to the risk for pancreatic leakage and fistula (PF) formation. Our results showed a significantly higher risk for PF in patients with high PRV and/or small PDW.
In conclusion, a high-quality preoperative MDCT is a very useful tool in the evaluation of PDAC in terms of tumor diagnosis, staging and prediction of postoperative complications. The low-tube-voltage high-iodine-load technique has the potential to improve tumor diagnosis and local staging.
List of papers:
I. Holm J, Loizou L, Albiin N, Kartalis N, Leidner B, Sundin A. Low tube voltage CT for improved detection of pancreatic cancer: detection threshold for small simulated lesions. BMC Med Imaging. 2012 Jul 24; 12:20.
Fulltext (DOI)
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II. Loizou L, Albiin N, Ansorge C, Andersson M, Segersvärd R, Leidner B, Sundin A, Lundell L, Kartalis N. Computed tomography staging of pancreatic cancer: a validation study addressing interobserver agreement. Pancreatology. 2013 Nov-Dec; 13(6): 570-5.
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III. L. Loizou, N. Albiin, B. Leidner, E. Axelsson, M.A. Fischer, A. Grigoriadis, M. Del Chiaro, R. Segersvärd, C. Verbeke, A. Sundin, N. Kartalis. Multidetector CT of pancreatic ductal adenocarcinoma: effect of tube-voltage and iodine-load on tumor conspicuity, vessel involvement and image quality. [Submitted]
IV. Frozanpor F, Loizou L, Ansorge C, Segersvärd R, Lundell L, Albiin N. Preoperative pancreas CT/MRI characteristics predict fistula rate after pancreaticoduodenectomy. World J Surg. 2012 Aug; 36 (8):1858-65.
Fulltext (DOI)
Pubmed
View record in Web of Science®
I. Holm J, Loizou L, Albiin N, Kartalis N, Leidner B, Sundin A. Low tube voltage CT for improved detection of pancreatic cancer: detection threshold for small simulated lesions. BMC Med Imaging. 2012 Jul 24; 12:20.
Fulltext (DOI)
Pubmed
View record in Web of Science®
II. Loizou L, Albiin N, Ansorge C, Andersson M, Segersvärd R, Leidner B, Sundin A, Lundell L, Kartalis N. Computed tomography staging of pancreatic cancer: a validation study addressing interobserver agreement. Pancreatology. 2013 Nov-Dec; 13(6): 570-5.
Fulltext (DOI)
Pubmed
View record in Web of Science®
III. L. Loizou, N. Albiin, B. Leidner, E. Axelsson, M.A. Fischer, A. Grigoriadis, M. Del Chiaro, R. Segersvärd, C. Verbeke, A. Sundin, N. Kartalis. Multidetector CT of pancreatic ductal adenocarcinoma: effect of tube-voltage and iodine-load on tumor conspicuity, vessel involvement and image quality. [Submitted]
IV. Frozanpor F, Loizou L, Ansorge C, Segersvärd R, Lundell L, Albiin N. Preoperative pancreas CT/MRI characteristics predict fistula rate after pancreaticoduodenectomy. World J Surg. 2012 Aug; 36 (8):1858-65.
Fulltext (DOI)
Pubmed
View record in Web of Science®
Institution: Karolinska Institutet
Supervisor: Kartalis, Nikolaos
Issue date: 2015-04-30
Rights:
Publication year: 2015
ISBN: 978-91-7549-868-3
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