Ultrasound demonstration of giant malignant breast cyst undetected by xeromammography.

The present case is unusual because, despite the underlying fatty breast pattern, the large size of the mass, and the presence of carcinoma, an essentially normal xeromammogram was obtained. This case demonstrates the necessity of performing a subsequent ultrasound examination on any patient in whom a palpable breast mass is not detected by xeromammography. The present case report clearly demonstrates that cyst aspiration plays a vital role in the evaluation of cystic breast masses.