A Case of Invasive Breast Carcinoma of No Special Type with a Medullary Pattern and Reactive Lymphoid Hyperplasia

Abstract

A 55-year-old female was seen for a primary complaint of a mass in the right breast. Needle biopsy revealed a solid invasive ductal carcinoma. PET/CT showed a high accumulation of FDG in the mass and in one axillary lymph node. Axillary lymph node metastasis was diagnosed. The clinical staging were cT2N1M0 and cStage IIB. Total mastectomy and axillary lymph node dissection were performed. Postoperative pathological findings revealed invasive breast carcinoma of no special subtype, with a medullary pattern, and lymph nodes showing reactive lymphoid hyperplasia. This disease is a tumor-infiltrating lymphocyte-rich invasive breast carcinoma of no special subtype that causes a strong immune response. Reactive swelling of lymph nodes can be mistaken for metastasis necessitating caution in diagnosis.