Case of the month - February 2007
History:
- 50 year old female - clinically malignant lump left breast - R5, U5 - core biopsy
Low power view (x 1.25) of core biopsy
Netsed area (A) and papillary area (B)

Medium (x10)power view of nested (left) and papillary (right) areas in core biopsy
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Medium (x20) power view of nested (left) and papillary (right) areas in core biopsy
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High power view (x 40) of papillary area to show cytoplasmic vacuoles

- What are the main features in this biopsy?
- Are there any additional stains that might help you with the diagnosis?
- What is your diagnosis?