Phyllodes Tumor in Adolescent Female

Introduction: Phyllodes tumors are rare occurrences in the general population, accounting for only 0.3-1% of all breast tumors. It is even more uncommon to see it in a pediatric patient. Phyllodes tumors are commonly seen in middle aged women between the ages of 40 to 55. Case Presentation: A 17-year-old Asian American female presented with an incidental finding of a mass on her left breast that she found during a self-breast exam. She has no personal and family history of breast tumors or cancer. She began menarche at the age of 9. An ultrasound was ordered, and the patient was started on antibiotics. Ultrasound findings showed a mass measured to be 4.4 cm x 2.4 cm x 4 cm and a guided core fine needle biopsy was arranged. Biopsy results showed a benign fibroepithelial mass. Patient had the mass excised and the measurements were reported to be 5.2 cm x 4.5 cm x 3 cm. Pathology from the excision showed with that the mass had appearance consistent with benign phyllodes tumor. Patient will follow up every 6 months for the next 3 years to monitor recurrence. Conclusion: This case exhibits a unique presentation of phyllodes tumor in an extremely uncommon age group.