title: Spontaneous regression of malignant lymphoma of the lumbar spine.
abstract: Spontaneous regression of diffuse B-cell type lymphoma of the lumbar vertebra is reported. A 61-year-old woman experienced spontaneous disappearance of a large psoas mass associated with an infiltrating process of the lumbar vertebrae. The biopsy of the residual change after spontaneous regression revealed reactive foamy histiocytes and small lymphocytes with no atypia. The lesion recurred 7 months later with no systemic treatment in the interim, when the diagnosis of lymphoma was finally made. Spontaneous regression may be related to potentiation of the host immune response, which affects tumor growth.
authors.affiliation: Department of Radiology, Iwate Medical University School of Medicine, 19-1 Uchimaru, Morioka 020-8505 Japan.
authors.forename: Shie
authors.initials: S
authors.lastname: Ohgi
authors.forename: Shigeru
authors.initials: S
authors.lastname: Ehara
authors.forename: Takashi
authors.initials: T
authors.lastname: Satoh
authors.forename: Sadafumi
authors.initials: S
authors.lastname: Kato
authors.forename: Kenji
authors.initials: K
authors.lastname: Shimosegawa
authors.forename: Yoji
authors.initials: Y
authors.lastname: Ishida
mesh_terms: D005260:Female; D006801:Humans; D008159:Lumbar Vertebrae / Q000473:pathology; D016393:Lymphoma, B-Cell / Q000175:diagnosis* / Q000473:pathology; D016403:Lymphoma, Large B-Cell, Diffuse / Q000175:diagnosis* / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D012008:Recurrence; D012075:Remission, Spontaneous; D013125:Spinal Neoplasms / Q000175:diagnosis* / Q000473:pathology