Abstract
The purpose of our study was to evaluate the utility of the apparent diffusion coefficient (ADC) value measurement in the diagnosis of peritoneal metastases on diffusion weighted magnetic resonance imaging. Diffusion weighted imaging with conventional magnetic resonance imaging sequences was performed on twenty consecutive oncology patients (group I) with peritoneal metastases. The ADC values of the metastases, the peritoneal fat around the metastases (group I) and the peritoneal fat in patients with no malignancy (group II) at b(0-100), b(0-600), and (b 0-1000) s/mm(2) gradients were measured and compared. The apparent diffusion coefficient values of three gradients in peritoneal metastases (2.27±0.4; 1.67±0.7 and 1.09±0.4×10(-3) mm(2)/s at b 100, 600 and 1000 gradients, respectively) were significantly lower than the ADC values of the peritoneal fat around metastases (3.07±0.4; 2.07±0.4; 1.33±0.3×10(-3) mm(2)/s at b 100, 600 and 1000 gradients, respectively) (p<0.05). There was no significant difference between the ADC values of peritoneal fat in the patients of group I and group II at the 3 diffusion gradients (p>0.05). The measurement of ADC values may be used as a complementary diagnostic method in differentiating peritoneal metastases from peritoneal fat on Diffusion Weighted MRI (DWMRI DWMRI).
Highlights
The depiction of peritoneal metastases associated with abdominal malignancies is more emphasized in conjunction with improved diagnostic imaging modalities [1,2,3]
Eight patients with peritoneal metastases were excluded from the study; four patients were excluded because their peritoneal metastases were too small (
In 5 patients, peritoneal metastases were diagnosed by repeated multidetector computed tomography (MDCT) and magnetic resonance imaging (MRI)
Summary
The depiction of peritoneal metastases associated with abdominal malignancies is more emphasized in conjunction with improved diagnostic imaging modalities [1,2,3]. Various imaging modalities, including ultrasonography (US), multidetector computed tomography (MDCT) and magnetic resonance imaging (MRI), are used for diagnosings peritoneal metastases [1]. Among these modalities, US is a time consuming and operator dependent technique for evaluating peritoneal metastases when careful assessment is required. Computed tomography is the most popular imaging modality for evaluating peritoneal tumors. MRI of the abdomen is a noninvasive and nonionizing imaging modality that provides multiplanar images [3]. Compared to CT, respiratory movement artifacts, lower spatial resolution and difficulty
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