Figure 1.

Examples of tissue images from three morphological classes Class 1 (top row): morphology resembling normal breast epithelium, extensive tubular formation, n=182; Class 2 (center row): intermediate tubular formation, n=494; and Class 3 (bottom row): morphology least resembling normal breast epithelium, no tubular formation, n=416. Images are classified into the three classes by a human observer.

Ojansivu et al. Diagnostic Pathology 2013 8(Suppl 1):S29   doi:10.1186/1746-1596-8-S1-S29