title: Acute myeloid leukemia relapsing as gynecomastia.
abstract: Granulocytic sarcoma (GS) is an increasingly common relapse feature of acute myeloid leukemia (AML), late in the disease course or post bone marrow transplantation (BMT). Any solid organ can be affected, and there have been a number of reports of GS in breast tissue in female patients. We present a unique case of GS in a male AML patient, presenting as painless gynecomastia immediately before BMT at advanced disease. Aberrant expression of CD56 was found in the relapsed GS tissue but not in the original AML clone. Twelve months after allogeneic BMT, leukemia relapsed again in the same breast, with normal marrow morphology and full donor chimerism. The lesion failed to respond to donor lymphocyte infusion, chemotherapy and radiotherapy, and disseminated to other subcutaneous tissues.
authors.affiliation: Department of Medicine, University Department of Medicine, Queen Mary Hospital, University of Hong Kong, Hong Kong.
authors.forename: W Y
authors.initials: WY
authors.lastname: Au
authors.forename: S K
authors.initials: SK
authors.lastname: Ma
authors.forename: Y L
authors.initials: YL
authors.lastname: Kwong
authors.forename: A K
authors.initials: AK
authors.lastname: Lie
authors.forename: W H
authors.initials: WH
authors.lastname: Shek
authors.forename: W C
authors.initials: WC
authors.lastname: Chow
authors.forename: R
authors.initials: R
authors.lastname: Liang
mesh_terms: D000328:Adult; D016026:Bone Marrow Transplantation; D019002:CD56 Antigen / Q000032:analysis; D006177:Gynecomastia / Q000209:etiology* / Q000473:pathology; D006801:Humans; D015470:Leukemia, Myeloid, Acute / Q000150:complications* / Q000473:pathology / Q000628:therapy; D008297:Male; D012008:Recurrence
chemical_list: D019002:CD56 Antigen