The aim of the retrospective study was to assess the diagnostic value of sonography for detection and characterisation of changes after breast-conserving therapy and irradiation. Extension, echogenicity, configuration of lesions in sonography examinations and follow-up examinations were the basis for correct diagnosis. Sonography and sonographic guided invasive procedures (FNAB, Core – cut biopsy) are mandatory tools to characterise unclear lesions after breast-conserving therapy and radiotherapy.

        Key words: ultrasound – breast cancer – breast-conserving therapy – radiotherapy – ultrasound guided biopsy