This is just a little bit of what is listed for this condition......
Phyllodes tumors are a fibroepithelial tumor composed of an epithelial and a cellular stromal component. They may be considered benign, borderline, or malignant depending on histologic features including stromal cellularity, infiltration at the tumor's edge, and mitotic activity. All forms of phyllodes tumors are considered breast cancer, as even the benign form is regarded as having malignant potential.
They are classified as a fibroepithelial tumor by ICD-O, but not by MeSH.
info from http://en.wikipedia.org/wiki/Phyllodes_tumor
Best wishes
I would think that the new Dr. may have a different opinion regarding this diagnosis. Did He/She have all the reports including the Pathology final before an opinion was given ?? Complete past history including films and reports would be needed to venture such an opinion. MRI is very valuable when dense breast tissue is involved. Regards ....