title: Metastasis of osteosarcoma to the trapezius muscle: a case report.
abstract: Metastasis of a primary osteosarcoma to the muscles is extremely rare. As there have been few reported cases, the necessity of surgical treatment for such metastatic lesions remains controversial. We present the case of a primary osteosarcoma with development of a solitary metastasis to the trapezius muscle during chemotherapy for pulmonary metastasis. The patient was a 51-year-old man diagnosed with osteosarcoma of the right tibia. After undergoing chemotherapy and femoral amputation, he developed pulmonary metastasis. Chemotherapy was reinitiated, however, after approximately 1 year a palpable tumor was identified in the patient's right shoulder. This tumor grew and was associated with pain in the right shoulder. It was surgically removed 3 years after the re-initiation of chemotherapy. The pathological diagnosis was osteosarcoma with metastasis to the trapezius muscle. Although the patient died of respiratory failure due to pulmonary metastasis 14 months after resection of the metastatic lesion in the trapezius muscle, no new extrapulmonary metastasis was observed after the resection.
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Sakamoto
authors.affiliation: Department of Orthopedic Surgery, Graduate School of Medical and Dental Sciences, Kagoshima University, 8-35-1 Sakuragaoka, Kagoshima 890-8520, Japan. masahiro@m3.kufm.kagoshima-u.ac.jp.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yokouchi
authors.forename: Satoshi
authors.initials: S
authors.lastname: Nagano
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Shimada
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Nakamura
authors.forename: Takao
authors.initials: T
authors.lastname: Setoguchi
authors.forename: Ichiro
authors.initials: I
authors.lastname: Kawamura
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Ishidou
authors.forename: Akihide
authors.initials: A
authors.lastname: Tanimoto
authors.forename: Setsuro
authors.initials: S
authors.lastname: Komiya
mesh_terms: D001859:Bone Neoplasms / Q000188:drug therapy / Q000473:pathology* / Q000601:surgery; D003131:Combined Modality Therapy; D006801:Humans; D008175:Lung Neoplasms / Q000188:drug therapy / Q000556:secondary* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D019042:Muscle Neoplasms / Q000188:drug therapy / Q000556:secondary* / Q000601:surgery; D012516:Osteosarcoma / Q000188:drug therapy / Q000473:pathology* / Q000601:surgery; D011379:Prognosis; D064171:Superficial Back Muscles / Q000187:drug effects / Q000473:pathology* / Q000601:surgery