Clinical characteristics and management of primary granulocytic sarcoma of the breast: A case report.

RATIONALE: Primary granulocytic sarcoma of the breast is a rare and poor-prognosis malignancy. Clinicians do not have sufficient knowledge of this disease and often misdirect it as other soft tissue sarcomas or inflammation.

PATIENT CONCERNS: A 42-year-old female presented with a self-discovered asymptomatic growing and palpable right breast mass that had been present for 4 months.

DIAGNOSES: The patient was diagnosed as primary myeloid sarcoma.

INTERVENTIONS: The patient received modified radical mastectomy in the right breast and sentinel lymph node biopsy. Pathological diagnosis is primary granulocytic sarcoma. Then the patient accepted acute myeloid leukemia-induction chemotherapy.

OUTCOMES: The follow-up of this patient has no evidence of disease progression or spread during 1 year.

LESSONS: Granulocytic sarcoma in the breast tissue is rare. But it still should be considered in the differential diagnosis of any tumor in the breast. The present study discusses comprehensively the clinical and pathological characteristics to improve the understanding of myeloid sarcoma.