Diagnostic accuracy of the apparent diffusion coefficient in differentiating benign from malignant uterine endometrial cavity lesions: initial results.
Our purpose is to evaluate the diagnostic accuracy of apparent diffusion coefficient (ADC) measurement in differentiating malignant from benign uterine endometrial cavity lesions. We retrospectively evaluated 25 uterine endometrial cavity lesions in 25 female patients: endometrial carcinoma (n = 11), carcinosarcoma (n = 2), submucosal leiomyoma (n = 8), and endometrial polyp (n = 4). Diffusion-weighted images were performed at 1.5 T with b factors of 0-1,000/mm(2). The region of interest was defined within the tumor on T2-weighted EPI image and then manually copied to an ADC map. Thereby, the ADC value was obtained. We compared ADC values between malignant and benign lesions using Student's t-test. The mean and standard deviation of ADC values (x10(-3) mm(2)/s) were as follows: endometrial carcinoma, 0.98+/-0.21; carcinosarcoma, 0.97+/-0.02; submucosal leiomyoma, 1.37+/-0.28; and endometrial polyp, 1.58+/-0.45. The ADC values differed significantly between malignant (0.98+/-0.19) and benign lesions (1.44+/-0.34) (P < 0.01). We defined malignant tumors as cases with an ADC value less than 1.15 x 10(-3) mm(2)/s for obtaining the highest accuracy. Sensitivity, specificity, and accuracy were 84.6%, 100%, and 92%, respectively. ADC measurement can provide useful information in differentiating malignant from benign uterine endometrial cavity lesions.
Fujii
Shinya
S
Division of Radiology, Department of Pathophysiological and Therapeutic Science, Faculty of Medicine, Tottori University, 36-1, Nishi-cho, Yonago, Tottori 683-8504, Japan. sfujii@grape.med.tottori-u.ac.jp
Matsusue
Eiji
E
Kigawa
Junzo
J
Sato
Shinya
S
Kanasaki
Yoshiko
Y
Nakanishi
Junko
J
Sugihara
Shuji
S
Kaminou
Toshio
T
Terakawa
Naoki
N
Ogawa
Toshihide
T
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002296:Carcinosarcoma / Q000175:diagnosis*; D003937:Diagnosis, Differential; D038524:Diffusion Magnetic Resonance Imaging / Q000379:methods*; D016889:Endometrial Neoplasms / Q000175:diagnosis*; D004717:Endometrium / Q000473:pathology*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007889:Leiomyoma / Q000175:diagnosis*; D008875:Middle Aged; D011127:Polyps / Q000175:diagnosis*; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012680:Sensitivity and Specificity