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The ultrasound study was unremarkable. Mammotome guided biopsy showed Masson's tumour. Masson was a pathologist who worked in Montreal. His original article appeared in 1923 " papillary endothelial hyperplasia" he called the lesion. The AFIP described 17 breast Masson tumours. All were unilateral. The differntila is angiosarcoma of the breast. The Masson tumours are less than 2 cm and angiosarcomas are usually larger than 2 cm.
The tumour has been described in fingers, the neck, tongue, muscle and retroperitoneum.
Not typically the first diagnosis I make in breast masses.