The patient underwent an image-guided percutaneous core biopsy.
Histopathology
MICROSCOPIC DESCRIPTION: The smears and cell block sections contain scattered malignant cells presenting in large groups, clusters and as single cells. The tumour cells have high N:C ratio, irregular nuclear outline, hyperchroamsia, macronucleoli and abundant pale cytolasm with mucin. Necrosis and frequent mitoses are noted. The background contains scattered lymphoid cells and macrophages.
COMMENT Tumour cells stain positive CK7 and weak positive Gata-3. Negative with CK20 and CDX2. Features are nonspecific and a breast metastasis and primary cancer are possible.