Table 1.

 Frequency of detection of multifocal disease, according to the number of quadrants sampled and whether there was invasive carcinoma or pure DCIS

Method of detection of multifocal disease	Number of quadrants sampled
	Four quadrants			Less than four quadrants
	Invasive	DCIS	Total	Invasive	DCIS	Total
Macroscopic examination	20	0	20	2	0	2
Microscopy of quadrant sections	11	0	11	5	1	6
Microscopy of nipple sections	3	0	3	0	0	0
Microscopy of nipple and quadrant sections	1	0	1	0	0	0
Microscopy of tumour sections (satellite foci near main lesion)	4	0	4	0	0	0
Total with multifocal disease	39	0	39	7	1	8
Total number of specimens	186	34	220	20	8	28

DCIS, ductal carcinoma in situ.