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Increased activity in benign phyllodes tumor on Tc-99m MDP scintimammography.

Phyllodes tumor is an uncommon fibroepithelial breast tumor. The authors describe a patient with a benign phyllodes tumor of the breast who underwent Tc-99m MDP scintimammography. Definitely increased activity at the site corresponding to the tumor was observed on images obtained soon after the injection of Tc-99m MDP. The mass was excised, and pathologic analysis showed it to be a benign phyllodes tumor. The case reported indicates that benign phyllodes tumor is a possible cause of false-positive findings on scintimammography with Tc-99m MDP.