The authors report two cases of giant fibroadenoma of the breast and discuss the diagnostic and therapeutic problems and the value of the "dermal vault" technique. A giant fibroadenoma is a fibroadenoma with a diameter exceeding 6 centimeters. This benign tumor has an inflammatory growth during pregnancy. An exact histological diagnosis is necessary to differentiate GFA from sarcoma phyllodes. The reconstructive concern should not jeopardize the quality of the removal. The "dermal vault" technique seems to meet these requirements: diagnosis and removal are made through a posterior approach and symmetrization of the volumes is easily obtained on clamp. The new location of the NAC should be outlined while bearing in mind that a cutaneous retraction of the upper parts will systematically occur.