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 diseaseNumber of quadrants sampled
Four quadrantsLess than four quadrants
DCIS, ductal carcinoma in situ.
Macroscopic examination20020202
Microscopy of quadrant sections11011516
Microscopy of nipple sections303000
Microscopy of nipple and quadrant sections101000
Microscopy of tumour sections (satellite foci near main lesion)404000
Total with multifocal disease39039718
Total number of specimens1863422020828