Role of diffusion weighted magnetic resonance imaging (DW MRI) in classification of liver hydatid cysts and differentiation of simple cysts and abscesses from hydatid cysts

Oruç, Esra; Yıldırım, Nalan; Topal, Naile Bolca; Kılıçturgay, Sadık; Akgöz, Semra; Savcı, Gürsel

doi:10.4261/1305-3825.dir.2807-09.2

Cited by 24 publications

(38 citation statements)

References 17 publications

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“…DWI is able to differentiate between benign and malignant focal hepatic lesions, in many cases because of the higher ADC of benign lesions compared with malignant lesions (56)(57)(58). This finding is thought to be the result of cellular membranes impeding the mobility of water molecules.…”

Section: Abdominal Applicationsmentioning

confidence: 98%

Diffusion weighted MRI for detecting and monitoring cancer: a review of current applications in body imaging

Türkbey

Aras

Karabulut

et al. 2011

Diagn Interv Radiol

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Imaging is used to detect, characterize, and monitor cancer. Recently, diffusion-weighted magnetic resonance imaging (DWI) has become a useful adjunct for assessing tumors with magnetic resonance imaging (MRI). DWI involves the acquisition of a magnetic resonance signal related to random thermal motion (Brownian motion) or the "diffusion" of water protons in tissue. The signal obtained with DWI is a measure of the net displacement of water molecules, e.g., the water path length in the extracellular, intracellular and intravascular spaces. This motion is largely random and can be reduced by structural barriers, such as cell membranes and collagen. Restricted diffusion in biological tissues is inversely proportional to tissue cellularity and the integrity of cell membranes, and it can be quantified with apparent diffusion coefficient (ADC) measurements (1). Depending on the microarchitecture, either restricted or increased diffusion can occur in malignant tumors. For instance, diffusion is restricted in cellular portions of the tumor, but it may be increased in necrotic portions (2, 3). Other causes of enhanced diffusion include increased water content arising from intratumoral edema and cystic tumor components (4-6).Although initially used to evaluate neurological diseases, the applications of DWI have been extended to oncologic imaging throughout the body made possible by improvements in MRI hardware and new sequences. The use of DWI as a complement to conventional MRI methods has led to improvements in the detection and characterization of tumors, treatment response monitoring, and detection of recurrence in oncology patients. Basic concepts of DWIIn 1965, Stejskal and Tanner (7) proposed the application of a symmetric pair of additional gradients on either side of the 180˚ refocusing radiofrequency pulse. The Stejskal-Tanner sequence is still the basis of modern DWI. For static water molecules, the phasing effect caused by the first gradient will be reversed by the second gradient, leading to no signal loss; however, this phasing effect will not be completely reversed if the water molecules are not stationary, which results in the observed well-known diffusion signal decay. The amount of diffusion weighting is determined by the b value, which describes the amplitude, duration of the applied gradient, and time interval between the two diffusion gradients (4). The degree of signal attenuation from water molecules is cor- ABSTRACT Diffusion-weighted magnetic resonance imaging (MRI), which involves the acquisition of a magnetic resonance signal related to the Brownian motion of water protons in tissue, has become a useful technique for assessing tumors. In this article, we review the basic concepts, imaging strategies, and body applications of diffusion-weighted MRI in detecting and monitoring cancer.

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Section: Abdominal Applicationsmentioning

confidence: 98%

Diffusion weighted MRI for detecting and monitoring cancer: a review of current applications in body imaging

Türkbey

Aras

Karabulut

et al. 2011

Diagn Interv Radiol

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“…Hydatid disease is a parasitosis most commonly caused by Echinococcus granulosus. This infection is more commonly seen in the developing world but occurs worldwide (55,56). Almost any organ can be affected by hydatid disease; however, the majority of cases (approximately 76%) involve the liver (57).…”

Section: Echinococcal Cystmentioning

confidence: 99%

“…The imaging appearance is similar to that of other entities including abscess, hematoma, cystic neoplasm, and pseudocyst (Fig 19). Specific imaging findings of hydatid cyst include wall calcification, identification of daughter cysts, and membrane detachment (55)(56)(57).…”

Section: Echinococcal Cystmentioning

confidence: 99%

A Spectrum of Entities That May Mimic Abdominopelvic Abscesses Requiring Image-guided Drainage

2018

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A variety of entities may mimic drainable abscesses. This can lead to misdiagnosis of these entities, unnecessary percutaneous placement of a pigtail drainage catheter, other complications, and delay in appropriate treatment of the patient. Types of entities that may mimic drainable abscesses include neoplasms (lymphoma, gallbladder cancer, gastrointestinal stromal tumor, ovarian cancer, mesenteric fibromatosis, ruptured mature cystic teratoma, recurrent malignancy in a surgical bed), ischemia/infarction (liquefactive infarction of the spleen, infarcted splenule), diverticula (calyceal, Meckel, and giant colonic diverticula), and congenital variants (obstructed duplicated collecting system). Postoperative changes, including expected anatomy after urinary diversion or Roux-en-Y gastric bypass and small bowel resection, may also pose a diagnostic challenge. Nonpyogenic infections (Mycobacterium tuberculosis, Mycobacterium avium complex, echinococcal cysts) and inflammatory conditions such as xanthogranulomatous pyelonephritis and gossypiboma could also be misinterpreted as drainable fluid collections. Appropriate recognition of these entities is essential for optimal patient care. This article exposes radiologists to a variety of entities for which percutaneous drainage may be requested, but is not indicated, and highlights important imaging findings associated with these entities to facilitate greater diagnostic accuracy and treatment in their practice. RSNA, 2018.

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“…Several surgical approaches have been introduced to eliminate residual cavity predisposed to complications. That is why some surgical methods such as marsupialization have been already dismissed from practice (14).…”

Section: Introductionmentioning

confidence: 99%

Open surgery for liver hydatid disease

Kolev

Ignatov

Ivanov

et al. 2013

SSM

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Role of diffusion weighted magnetic resonance imaging (DW MRI) in classification of liver hydatid cysts and differentiation of simple cysts and abscesses from hydatid cysts

Cited by 24 publications

References 17 publications

Diffusion weighted MRI for detecting and monitoring cancer: a review of current applications in body imaging

Diffusion weighted MRI for detecting and monitoring cancer: a review of current applications in body imaging

A Spectrum of Entities That May Mimic Abdominopelvic Abscesses Requiring Image-guided Drainage

Open surgery for liver hydatid disease

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