Mammography:
They are present as irregular masses in 75% of the cases, circumscribed oval or round masses in 18% of the cases and with indistinct margins or architectural distortion in 8% of the cases [14,41]. They are often hyperdense or isodense [14]. Even if the mass is circumscribed, it is infiltrated on microscopy. Retrospective careful review of the images often demonstrates some focally indistinct or spiculated margins. Generally, microcalcifications are not seen [14,41,42,43]. GCTBs are usually small, less than 3 cm in diameter. Some other reported features are hypodense rim and heterogeneity [11,14,41]. GCTBs are frequently reported in the upper and upper inner quadrant of the breast in up to 83 % of the cases [40], which matches the cutaneous sensory branches of the supraclavicular nerve [7,40,44], but they are reported in all quadrants and in the axilla. GCTB can not only invade adjacent structures such as overlying skin or muscles [14], but also can invade adjacent fibroadenomas or lymph nodes [46] and be associated with fat necrosis [16] or breast malignancy [28,40].