An hamartoma is rarely dangerous and is not malignant. So there is no reason to worry. The only point of concern is the size which is large and needs to be attended to
Next Steps
Though hamartoma is classical in radiological examination, as the lump is 6.5 cm, it needs to be biopsied to confirm that it is hamartoma and not a malignant lump. even if it is a hamartoma, due to the sheer size of lump I would advice for surgical excision of the breast lump after a biopsy
Health Tips
in any breast lump a clinical examination by a doctor, a scan (mammogram/ultrasound) and biopsy is mandatory and needs to be done. Though imaging suggests hamartoma the biopsy needs to be done and not ignored.