Safely reducing unnecessary benign breast biopsies by applying non-mass and DWI directional variance filters to ADC thresholding

Table 1 Lesion characteristics

Characteristic	No. of Lesions	% ^§
Size (cm²)
< 1.0	29	42.0
1.0–2.0	17	24.6
> 2.0	23	33.3
Type
Mass	51	73.9
Non-mass	18	26.1
Mammographic density
Extreme	11	15.9
Heterogeneous	58	84.1
Histology
Malignant (all)	38	55.1
IDC	15	21.7
IDC with DCIS	10	14.5
DCIS	7	10.1
ILC	5	7.2
Metaplastic carcinoma	1	1.4
Benign (all)	31	44.9
Fibroadenoma	11	15.9
Intraductal papilloma	4	5.8
Apocrine metaplasia	4	5.8
Adenosis	2	2.9
UDH	2	2.9
Stromal proliferation	1	1.4
Perilobular and periductal inflammation	1	1.4
Focal stromal fibrosis	1	1.4
Complex sclerosing lesion	1	1.4
PASH	1	1.4
Chronic inflammation	1	1.4
Atrophic changes	1	1.4
ADH	1	1.4

^§ Percentages do not add to 100% due to rounding
“Extreme”—extremely dense breast tissue, “Heterogeneous” —heterogeneously dense breast tissue, “IDC”—invasive ductal carcinoma, “DCIS”—ductal carcinoma in situ, “ILC”—invasive lobular carcinoma, “UDH”—usual ductal hyperplasia, “PASH”—pseudoangiomatous stromal hyperplasia, “ADH”—atypical ductal hyperplasia

ISSN: 1471-2342