Figure 1: (a) Microscopic examination of the breast mass showed an infiltrative tumor characterized by the presence of micropapillary pattern within retraction spaces (H&E, 20×); (b and c) these micropapillae were identified as nest (H&E, 100×) and acini (H&E, 400×); and (d) these tumor cells showed a reverse pattern (abluminal side) of EMA positivity (IHC, 400×)