Two cases of granular cell tumor of the breast

To investigate the clinicopathologic features of granular cell tumor (GCT) of the breast in order to make a diagnosis and give treatment strategy of this disease. Two cases of granular cell tumor (GCT) of the breast were reported, and the clinical presentation, pathological examination and surgical procedure were analyzed. Clinical presentations were atypical, and the tumor was characterized by clear or ill-defined boundary, abundant cytoplasm, full of eosinophilic granular, and infiltrative growth. Immunohistochemical study revealed that tumor cells were positive with S-100, CD68 and vimentin but negative with cytokeratin (CK) and epithelial membrane antigen (EMA) . GCT of the breast is rare, most of which is benign tumor that may be misdiagnosed as malignancy. Wide resection is the main curative treatment. The prognosis is good. The understanding of this disease should be strengthened to avoid being operated excessively. Long-term follow-up should be performed. Key words: Breast tumor; Granular cell tumor