We present the case of a young woman with classical nodular sclerosing Hodgkin's lymphoma (clinical stage IIB). During staging work-up, intense gallium-67 ((67)Ga) accumulation in a left breast lump raised the suspicion of an extranodal deposit, but biopsy favoured a benign histology. A post-treatment (67)Ga scan showed complete remission of the disease with normal tracer uptake in the left breast. However, a few months after treatment, a faint left mammary concentration of (67)Ga was observed. The breast mass was excised and histopathology was consistent with fibroadenoma. This unusual presentation is a new addition to the literature on false-positive (67)Ga findings and chemotherapy-associated tracer changes.