Age

18–any

Sex

ALL

Healthy volunteers

Not accepted

1. adults (men and women) who are ≥ 18 years of age
2. diagnosed with primary unilateral non-metastatic or oligometastatic breast cancer
3. scheduled for surgery (mastectomy or breast conserving surgery; in combination with axillary lymph node dissection or sentinel node biopsy)
4. able to read, understand, and speak Dutch
5. have voluntary written informed consent of the patient

1. distant metastases
2. planned bilateral lymph node surgery
3. oedema of the arm from another cause
4. an allergy to iodine or Indocyanine Green (ICG), or
5. physically or mentally unable to participate throughout the entire duration of the study

Who and Why do Patients Report Lymphedema After Breast Cancer Treatment Without an Objective Measurable Swelling