TABLE 3. Properties of Nine Tumors in Eight Patients That Were False-Negative (FN) on Readings by All Three Radiologists.

FN Tumor No.	Tumor			CC Breast Thickness (cm)	Count Density Percentile	Mammography Breast Density	Comments
	Type	Grade	Size (mm)
1	IDC	I	13.5	4.9	77.3	Almost entirely fatty	Inadequate positioning due to  kyphotic patient; tumor not in  view
2	ILC	II	17.5	6.5	15.7	Heterogeneously dense	Image has low count density;  lobular cancer
3a	IDC and ILC	I	4.0	4.0	87.6	Heterogeneously dense	Small low-grade tumor; intense  nonmasslike tracer uptake
3b	ILC	III	7.0	3.0	92.6	Heterogeneously dense	Intense nonmasslike tracer  uptake
4	IDC	I	3.3	6.0	9.2	Heterogeneously dense	Small, low-grade tumor; image  has low count density
5	IDC	II	3.3	6.5	9.0	Scattered fibroglandular densities	Small tumor; image has low  count density
6	Tubular carcinoma	II	5.0	7.5	13.1	Almost entirely fatty	Small tumor; image has low  count density
7	IDC	II	7.3	7.0	36.6	Scattered fibroglandular densities	Inadequate positioning due to  obese patient; tumor not in  view
8	ILC	I	7.0	7.5	76.2	Heterogeneously dense	Small low-grade lobular cancer

Note—CC = craniocaudal, IDC = invasive ductal carcinoma, ILC = invasive lobular carcinoma.