Background:

Phyllodes tumors originate from the stroma of the mammary gland. The frequency is fewer than 1% predominating in women between 35 and 55 years. They typically present as moving, rounded nodules, usually painless, and may have rapid growth. The treatment of choice is the local excision of the lesion, both for benign and malignant forms, with margins of less than 1 cm.

Clinical case:

Female patient, 42 years old, nulliparous, with no family history of breast cancer. In February 2016 she noticed an increase in volume in the lower internal quadrant of the left breast, which is why she attended with multiple doctors receiving unspecified treatments. He consulted us by presenting a large tumor in the lower internal quadrant of the left breast, whose growth was progressive until the mammary gland was deformed. He underwent ultrasound, which reports BIRADS IV proceeding to perform a Trucut Biopsy; with a histopathological diagnosis of Phyllodes tumor of low grade of malignancy, for which he undergoes radical treatment by means of a mastectomy on February 22, 2017. The final histopathological study reports: Low grade Phyllodes tumor with focal chondroid metaplasia.

Conclusion:

It is important to deepen the histological strain of the phyllodes tumor, in order to establish the appropriate treatment and stop the natural evolution of the disease, which in extreme cases causes the total destruction of the mammary gland

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