RESUMEN
The intracystic breast cancer is rare, it may present a misleading cystic appearance. Ultrasound shows an endocystic bud. Histology often found papillary carcinoma. Patient of 27 years followed for fibrocystic dystrophy. Breast ultrasound showed an heterogeneous cystic biloculee. The echographic control is increased the size of the cyst. Surgical excision shows that this is an intracystic papillary carcinoma in situ. MRI done at postoperative inflammatory banks, the recovery of post-operative banks reveals multiple microscopic foci of carcinoma in situ high grade. Mastectomy was performed. The intracystic ductal carcinoma is a rare malignant tumor of the ductal elderly woman. It is characterized by slow growth, with a good prognosis. Often discovered during a breast swelling recently enlarged. A mammogram shows a well-circumscribed oval mass, or sometimes indistinct in places. Breast ultrasound can reveal any complex cysts with a solid component, hyperechoic pendant to the inner wall of the cyst. Eliminates the doppler diagnostic reshaped heavy cyst content and confirms the tissue character by the presence of a central vascular pedicle. Ultrasound is the best test to distinguish between solid and liquid formations breast with mammographic appearance is close to intracystic carcinomas as medullary cancer and breast cysts. The best distinguishing criteria I seem to be: a large size of the intracystic vegetation, heterogeneous echogenicity and irregular edges of the intracystic mass. Some carcinoma in situ high grade can be mistaken for cystic lesions overhaul. The ultrasound meticulous analysis of the lesion i and its edges of its outline and its vascularization moving towards malignancy. Nevertheless, surgical resection is needed in doubt before any atypical cystic lesion