BACKGROUND: Carcinoma en cuirasse is a form of metastatic cutaneous breast 
malignancy occurring most commonly on the chest as a recurrence of breast 
cancer, but it can be the primary presentation.
OBJECTIVE: To discuss the clinical features of carcinoma en cuirasse that 
distinguish it from hypertrophic scars and keloids of the chest.
METHOD: We report a 63-year-old woman with primary cutaneous breast carcinoma 
presenting as keloid nodules on the chest that failed treatments for keloids. 
Biopsy revealed a pattern of breast carcinoma in the skin.
RESULTS: After further workup, no tumor was found in the deep breast tissue, but 
metastases were found in her axillary lymph nodes.
CONCLUSIONS: Unusual keloid-like nodules or scars on the chest that fail to 
respond to therapy may be primary or metastatic malignancies, and adequate 
histologic verification should be obtained to avoid delay in the proper 
treatment.