Diagnosis - Invasive carcinoma, no special type, Grade 1
Features to note:
- Discrete tumour mass with infiltration by nests of epithelial cells in solid groups and acinar forms
- Tumour cytology "malignant"
- Local stromal recation to invasive tumour cells - oedema and elastosis
- Only one cell type present in tumour groups - no myoepithelial component seen - use immuno to confirm if in doubt