Recurrent breast cancer in imaging is given to recurrence of malignancy within the same breast at or close to the resection site more than two years following the surgical excision. Bilateral cancers diagnosed within 6 months of the first primary cancer diagnosis are categorized as synchronous cancers. Metachronous breast cancer is defined as breast cancer diagnosed after 6 months of the first primary cancer diagnosis. 

After breast conservation the incidence of ipsilateral recurrent breast carcinoma is about 1% per year for invasive breast cancer and is slightly less for ductal carcinoma in situ (DCIS).

Any locoregional symptom such as a palpable lump, new pain, changes in breast configuration, or skin changes in a patient with a personal history of breast cancer should be carefully evaluated by a thorough clinical exam and tailored imaging.

This retrospective analysis included eight cases of suspected scar recurrence , which were evaluated using various imaging modalities including mammography, ultrasound, elastography, MRI, and PET CT. Histopathological confirmation through biopsy was performed for all cases, revealing six out of eight cases confirmed as recurrence(cases 1 and 2). The remaining two cases were diagnosed as inflammatory pathology(stitch granuloma) (case 3) and post-operative changes (fat necrosis with healing scar tissue).