Ductal Carcinoma in Situ of the Breast

Variant: Pure Micropapillary Ductal Carcinoma In Situ

Dilated ducts lined by stratified population of monotonous cells
Small finger-like or club shaped protuberances with bulbous ends
- May form arches
Cells must be the same from base to tips
When pure it is frequently multifocreported cases al and multicentric
- Based on small numbers of
- Clinical significance is not known
- Some surgeons consider this to be an indication for mastectomy
  - Be certain that the pattern is pure before reporting as such
Usually low grade but may be high grade
No special significance if mixed with usual cribriform pattern
Not related to invasive micropapillary carcinoma