Authors describe a case of 75-year-old woman with histologically confirmed diagnosis of multicentric reticu- lohistiocytosis and coincidental breast carcinoma erysipeloides with axillary lymph node metastases. Together with clinical description of this rare disease classified as non-Langerhans cell histiocytosis, the review of its dia- gnostics, clinical and histopathological differential diagnosis and therapeutical options are reviewed. Attention is drawn to frequent coincidence with malignant tumors.

        Key words: multicentric reticulohistiocytosis – non-Langerhans cells – breast carcinoma