Diffusion-weighted magnetic resonance imaging in cystic renal masses.
BACKGROUND
We aimed to introduce the diagnostic value of diffusion-weighted (DWI) magnetic resonance imaging (MRI) for distinguishing benign and malignant renal cystic masses.


METHODS
Abdominal DWI-MRIs of patients with Bosniak categories 2F, 3, and 4 cystic renal masses were evaluated retrospectively. Cystic masses were assigned as benign or malignant according to histopathological or followup MRI findings and compared with apparent diffusion coefficient (ADC) values.


RESULTS
There were 30 patients (18 males and 12 females, mean age was 59.23 ± 12.08 years [range 38-83 years]) with cystic renal masses (eight Bosniak category 2F, 12 Bosniak category 3, 10 Bosniak category 4). Among them, 14 cysts were diagnosed as benign and 16 as malignant by followup imaging or histopathological findings. For the malignant lesions, the mean ADC values were lower than for benign lesions (p=0.001). An ADC value of ≤2.28 ×10-6mm2/s or less had a sensitivity of 75% and a specificity of 92.86% for detecting malignancy.


CONCLUSIONS
ADC can improve the diagnostic performance of MRI in the evaluation of complex renal cysts when used together with conventional MRI sequences.
Department of Radiology, Göztepe Training and Research Hospital, Medical School of Istanbul Medeniyet University, Istanbul, Turkey.
Fikret
F
Balyemez
Department of Radiology, Ümraniye Training and Research Hospital, Istanbul, Turkey.
Ahmet
A
Aslan
Department of Radiology, Göztepe Training and Research Hospital, Medical School of Istanbul Medeniyet University, Istanbul, Turkey.
Ibrahim
I
Inan
Department of Radiology, Göztepe Training and Research Hospital, Medical School of Istanbul Medeniyet University, Istanbul, Turkey.
Ercan
E
Ayaz
Department of Radiology, Göztepe Training and Research Hospital, Medical School of Istanbul Medeniyet University, Istanbul, Turkey.
Vildan
V
Karagöz
Department of Pathology, Göztepe Training and Research Hospital, Medical School of Istanbul, Medeniyet University, Istanbul, Turkey.
Sıdıka Şeyma
SŞ
Özkanli
Department of Radiology, Göztepe Training and Research Hospital, Medical School of Istanbul Medeniyet University, Istanbul, Turkey;; Department of Radiology, King Hamad University Hospital, Bahrain.
Murat
M
Acar