Figure 1.

Ductal systems of the breast. (a) Ductal systems as depicted by Astley Cooper (1841). (b) Computer reconstruction of ductal systems as depicted by James Going and colleagues (2004; copyright the Pathological Society of Great Britain and Ireland; reproduced with permission granted by John Wiley and Sons Ltd on behalf of the PathSoc). (c) 'Tubercles' as depicted by Astley Cooper (1841). (d) 'Tubercle' as depicted by Otto Sartorius (1972).