Pankreas kanseri -karaciğer metastazlarında diffüzyon ağırlıklı manyetik rezonans görüntüleme

Year 2018, Volume: 17 Issue: 2, 78 - 84, 24.09.2018

Melike Ruşen Metin , Mustafa Tahtacı

https://doi.org/10.17941/agd.462964

Abstract

Giriş ve Amaç: Pankreas kanseri günümüzde sık görülen,
medikal tedaviye dirençli ve kötü prognozlu tümörlerden biridir. Görüntüleme
yöntemleri ile hem primer tümörün hem de metastazlarının saptanmasında
güçlükler yaşanmaktadır. Bu çalışmanın amacı pankreas kanserinde operabilite
kriterlerinden olan karaciğer metastazlarının saptanmasında çok kesitli
bilgisayarlı tomografi ve difüzyon ağırlıklı görüntüleme sekansları ile
birlikte manyetik rezonans görüntülemenin katkılarını karşılaştırmaktır. Gereç ve Yöntem: 2012-2017 yılları arasında merkezimizde pankreas
kanseri tanısı alan 79 hastaya ait çok kesitli bilgisayarlı tomografi ve
difüzyon ağırlıklı manyetik rezonans görüntüleri retrospektif olarak
değerlendirildi. Çalışmaya dahil ettiğimiz 63 hastanın 45’i adenokanser, 18’i
pankreatik nöroendokrin tümör tanısı alan hasta idi. Çok kesitli bilgisayarlı
tomografi ve difüzyon ağırlıklı manyetik rezonans görüntülemede tespit edilen
karaciğer metastazları sayı olarak karşılaştırıldı. Ayrıca manyetik rezonans
görüntüleme ile her iki grup primer tümörlerinden yapılan görünür difüzyon
katsayısı ölçümleri arasında anlamlı fark olup olmadığı ve her iki gruba ait
metastatik kitleler arasındaki görünür difüzyon katsayı değerlerinin farkı
incelendi. Bulgular: Difüzyon ağırlıklı manyetik rezonans görüntülemede çok
kesitli bilgisayarlı tomografiye kıyasla daha fazla sayıda metastaz tespit
edildi (%38,10). Adenokanser ve pankreatik nöroendokrin tümörlerde primer
tümörlerden yapılan ölçümlerde görünür difüzyon katsayı değerleri dağılımları
istatistiksel olarak önemli bir farklılık göstermedi (p=0.976 ). Aynı şekilde
her iki gruba ait metastazlardan yapılan görünür difüzyon katsayı ölçümlerinde
istatistiksel olarak anlamlı fark saptanmadı (p=0.140). Tartışma: Pankreas kanseri hastalarında tek tedavi yönteminin cerrahi
olduğu düşünüldüğünde evreleme ve tümör tipinin belirlenebilmesi açısından hem
primer kitlelerin hem de metastazlarının görüntüleme yöntemleriyle tanısının ne
kadar önemli olduğu anlaşılmaktadır. Günümüzde henüz pankreas kanseri
hastalarında karaciğer metastazlarının tespit ve spesifiye edilmesinde
kullanılan uluslararası bir kılavuz yayınlanmamıştır. Ancak kontrastlı çok
kesitli bilgisayarlı tomografi incelemelerinde tespit edilen fakat spesifiye
edilemeyen karaciğer kitlelerinde manyetik rezonans görüntülemeye
başvurulmaktadır. Konvansiyonel manyetik rezonans görüntüleme incelemelerinde
de benzer sıkıntılar yaşanabilmektedir. Difüzyon ağırlıklı manyetik rezonans
görüntüleme ile inceleme konvansiyonel manyetik rezonans görüntüleme
sekanslarına ek sekans olarak aynı oturumda ve kısa sürede yapılabilmektedir.
Bu çalışmada pankreas kanseritanılı hasta serimizde hastaların %38,10’nunda;
difüzyon ağırlıklı manyetik rezonans görüntüleme ile incelemede çok kesitli bilgisayarlı
tomografiden daha fazla karaciğer metastazı saptandı. Bu nedenle gereksiz
cerrahi ve cerrahinin neden olduğu morbidite ve mortaliteden korunmak amacıyla
pankreas kanseri tanılı hastalarda karaciğer metastazı saptanması ve
dolayısıyla evrelemede difüzyon ağırlıklı manyetik rezonans görüntülemenin
tarama amaçlı gerçekleştirilmesi gerektiğini düşünmekteyiz.

Keywords

Pankreatik kanser, difüzyon ağırlıklı manyetik rezonans, çok kesitli bilgisayarlı tomografi, karaciğer metastazı

Diffusion weighted magnetic resonance imaging of hepatic metastasis of pancreatic cancer

Abstract

 

Background and Aims: Pancreatic cancer is one of the tumors that
occurs most commonly, is resistant to medical treatment, and has a
poor prognosis. Imaging methods present difficulties in detecting both primary
and metastatic tumors. The aim of this study was to compare the contribution of
diffusion-weighted magnetic resonance imaging with that of multiple detector
computed tomography in the detection of liver metastases based on the
operability criteria of pancreatic cancer. Materials and Methods: Multiple
detector computed tomography and diffusion-weighted magnetic resonance imaging
images of 79 patients diagnosed with pancreatic cancer in our center during
2012-2017 were evaluated retrospectively. Of the 63 patients included in the
study, 45 had adenocarcinoma and 18 had pancreatic neuroendocrine tumor. The
liver metastases detected via multiple detector computed tomography and
diffusion-weighted magnetic resonance imaging images were compared. The liver
metastases detected in multiple detector computed tomography and
diffusion-weighted magnetic resonance imaging were compared in numbers. In
addition, the difference between the apparent diffusion coefficient
measurements between the two groups of primer tumors in magnetic resonance
imaging and the difference between the apparent diffusion coefficient values
between the metastatic masses in both groups were examined. Results: A larger number of metastases were detected in
diffusion-weighted magnetic resonance imaging than in multiple detector
computed tomography images (38.10%). The distributions of apparent diffusion
coefficient values of the measurements made from primary tumors in patients
with adenocarcinoma and pancreatic neuroendocrine tumor were not statistically
significant (p=0.976). Similarly, there was no statistically significant
difference between the apparent diffusion coefficient measurements obtained
from the metastases of both groups (p=0.140). Discussion: When we
consider the fact that the only treatment method for pancreatic cancers is
surgery, it is understood how important it is to recognize both primary masses
and metastases using imaging methods to determine the staging and tumor type.
Currently, there are no published international guidelines for the
identification and specification of liver metastases in patients with
pancreatic cancer. However, magnetic resonance imaging has been applied to
detect liver masses in contrast-enhanced multiple detector computed tomography,
though not specifically. Similar problems can be experienced in conventional
magnetic resonance examinations. Diffusion-weighted magnetic resonance imaging
examination can be performed in the same session and in a short time as an
additional sequence to conventional magnetic resonance sequences. In this
study, more metastases were detected in diffusion-weighted magnetic resonance
imaging than multiple detector computed tomography in %38,10 of the patients
diagnosed with pancreas cancer. To prevent morbidity and mortality caused due
to unnecessary surgeries, we believe that liver metastasis
should be detected in patients with pancreatic cancer, and therefore,
diffusion-weighted magnetic resonance imaging should be performed for screening
purposes.

Keywords

Pancreatic cancer, diffusion weighted magnetic resonance imaging, multiple detector computed tomography, hepatic metastasis

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