Invasive micropapillary carcinoma is a rare form of breast cancer accounting for less than 2% of all invasive breast carcinomas. Microscopically the tumour is characterized by small infiltrating morula-like clusters of neoplastic cells. The clusters of cells are often separated from the stroma by a clear space or cleft. The tumour cells display reverse polarity also known as an “inside-out” pattern where the apical pole faces the stroma. Micropapillary carcinoma is an aggressive cancer that is associated with a high rate of lymph node metastasis and local recurrence.