I had a large Core needle biopsy done 2 weeks prior to surgery to my breast surgery for DCIS with a focus of less than 1mm of microinvasion, & a sentinel node was taken out for examination.
What does the information below mean.
My pathology report stated: Sentinel Node #1, Excisional Biopsy:
Touch Preparation Smear: No Malignant Cells Seen.
H&E Sections: One Lymph Node with Reactive Hyperplasia: No evidence of Metastiatic Carcinoma.
Cytokeratin Immunostain: No Evidence of Metastatic Carcinoma.
What is Reactive Hyperplasia? What causes it? Is this common?