Diagnostic accuracy of diffusion-weighted imaging with conventional MR imaging for differentiating complex solid and cystic ovarian tumors at 1.5T

Table 1 Histological types and apparent diffusion coefficient (ADC) values of 202 ovarian masses

Type of ovarian mass	Lesions, number	High SI on T2-WI	High SI on DWI	Range of ADC values	Mean ADC values
Benign ovarian lesions	74	39 (52.7)	53 (71.6)	0.12, 1.81	1.22 ± 0.46
Serous cystadenoma	28	22 (78.6)	28 (100)	1.23, 1.81	1.52 ± 0.19
Mucinous cystadenoma	17	13 (76.5)	17 (100)	1.12, 1.79	1.48 ± 0.20
Fibrothecoma	18	3 (16.7)	3 (16.7)	0.40, 1.58	0.82 ± 0.44
Cystadenofibroma	6	0 (0)	0 (0)	0.12, 0.94	0.52 ± 0.26
Brenner tumor	5	1 (20)	5 (100)	0.88, 1.44	1.06 ± 0.23
Malignant ovarian lesions	128	108 (84.4)	128 (100)	0.56, 1.45	0.91 ± 0.20
Serous cystadenocarcinoma	35	26 (74.3)	35 (100)	0.66, 1.35	0.97 ± 0.20
Mucinous cystadenocarcinoma	27	20 (74.1)	20 (100)	0.65, 1.31	0.89 ± 0.19
Serous borderline tumor	12	10 (83.3)	10 (100)	0.78, 1.45	1.05 ± 0.19
Mucinous borderline tumor	9	8 (88.9)	9 (100)	0.75, 1.36	0.99 ± 0.17
Clear cell adenocarcinoma	8	8 (100)	8 (100)	0.69, 1.01	0.82 ± 0.13
Endometrioid adenocarconoma	6	6 (100)	6 (100)	0.71, 1.06	0.93 ± 0.11
Granulosa cell tumor	7	6 (85.7)	6 (100)	0.79, 1.33	0.98 ± 0.18
Undifferentiated adenocarcinoma	5	5 (100)	5 (100)	0.64, 1.19	0.83 ± 0.23
Metastatic tumors	19	19 (100)	19 (100)	0.56, 1.09	0.86 ± 0.15

Numbers in parentheses are percentages; ADC values, (mean ± SD × 10^-3mm²/s); T2-WI, T2-weighted image; SI, signal intensity; DWI, diffusion-weighted imaging.

ISSN: 1477-7819