Abstract
Background: Phyllodes tumours are rare fibroepithelial lesions that account for less than 1% of all breast neoplasm. However, phyllodes tumours arising from ectopic breast tissue are even rarer, with less than 15 cases ever reported involving the axilla, vulva and groin.
Case Presentation: A 27-year-old lady presented to the surgical clinic with left axillary swelling, measuring 5cm x 6cm. Ultrasound of the axilla revealed heterogenous mass displacing the left axillary artery and vein medially. Excision was performed, and histopathological examination confirmed the diagnosis of a benign phyllodes tumour.
Conclusion: Phyllodes tumour in ectopic breast tissue over the axilla is a rare occurrence, and our case is the fourth case ever reported. Despite its rarity, diagnosis and treatment modalities are similar to phyllodes tumour of the breast. Regular follow-up is recommended owing to the risk of local recurrence.
Keywords: Phyllodes, Tumour, Ectopic, Axilla, Breast, Mammary.