title: Childhood Ki-1 lymphoma: presentation as a buttock mass.
abstract: Ki-1 lymphoma is a rare, large-cell anaplastic non-Hodgkin's lymphoma that most commonly affects older children and young adults. Presentation usually occurs as a localized infiltration of the skin and lymph nodes. We report an unusual case of childhood Ki-1 lymphoma that presented as a buttock mass in an eight-year-old girl, Pathologic evaluation revealed the characteristic lymphoma cells expressing Ki-1 antigen (CD-30), HLA-DR, interleukin 2 (CD-25), T-cell gene rearrangement, and the cytogenetic karyotype t(2;5). The patient is in complete remission following treatment with combination chemotherapy. This report broadens the clinical spectrum associated with Ki-1 lymphomas and illustrates the importance of combining routine pathologic examination with other specialized diagnostic techniques in the evaluation of childhood soft-tissue masses.
authors.affiliation: Department of Pediatrics, University of New Mexico, School of Medicine, Albuquerque 87131.
authors.forename: S S
authors.initials: SS
authors.lastname: Winter
authors.forename: M H
authors.initials: MH
authors.lastname: Duncan
authors.forename: E
authors.initials: E
authors.lastname: Foucar
authors.forename: T S
authors.initials: TS
authors.lastname: McConnell
authors.forename: K C
authors.initials: KC
authors.lastname: Cartwright
mesh_terms: D000782:Aneuploidy; D015703:Antigens, CD / Q000032:analysis; D000951:Antigens, Neoplasm / Q000032:analysis; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use; D014408:Biomarkers, Tumor / Q000032:analysis; D001761:Bleomycin / Q000008:administration & dosage; D002081:Buttocks / Q000293:injuries; D002648:Child; D003520:Cyclophosphamide / Q000008:administration & dosage; D003561:Cytarabine / Q000008:administration & dosage; D004317:Doxorubicin / Q000008:administration & dosage; D005047:Etoposide / Q000008:administration & dosage; D005260:Female; D015329:Gene Rearrangement, T-Lymphocyte; D006801:Humans; D017730:Ki-1 Antigen; D008207:Lymphatic Metastasis; D016403:Lymphoma, Large B-Cell, Diffuse / Q000188:drug therapy / Q000235:genetics / Q000276:immunology / Q000473:pathology*; D008727:Methotrexate / Q000008:administration & dosage; D011241:Prednisone / Q000008:administration & dosage; D012074:Remission Induction; D012983:Soft Tissue Neoplasms / Q000188:drug therapy / Q000235:genetics / Q000276:immunology / Q000473:pathology*; D006377:T-Lymphocytes, Helper-Inducer / Q000473:pathology; D014750:Vincristine / Q000008:administration & dosage
chemical_list: D015703:Antigens, CD; D000951:Antigens, Neoplasm; D014408:Biomarkers, Tumor; D017730:Ki-1 Antigen; D003561:Cytarabine; D001761:Bleomycin; D014750:Vincristine; D005047:Etoposide; D004317:Doxorubicin; D003520:Cyclophosphamide; D011241:Prednisone; D008727:Methotrexate