title: Low-Grade Myxofibrosarcoma of the Rectus Abdominus Muscle Infiltrating into Abdominal Cavity: A Case Report.
abstract: Objective:Myxofibrosarcoma (MFS) is a relatively rare tumor that is histologically characterized by myxoid stroma and spindle cell proliferation. This tumor most commonly arises as a slow growing, enlarging painless mass in the extremities of elderly patients.Methods:We report a case of a primary, low-grade MFS in the rectus abdominis muscle infiltrating the abdominal cavity of a 75-year-old man.Results:The patient underwent a wide excision of the right abdominal wall mass with a 3-cm surgical margin from the scar due to a biopsy. The tumor infiltrated the urinary bladder, peritoneum, and external iliac vessels. Twenty-six months after the initial operation, he had recurrences in his abdominal wall, urinary bladder, and right iliac vessels.Conclusions:To our knowledge, primary MFS of the muscle in the abdomen has not been documented previously. Although this case was histopathologically classified as a low-grade tumor, it infiltrated the abdominal cavity. The tumor is suspected to have penetrated the abdominal cavity below the linea arcuata, which lacks the posterior sheath of the rectus abdominis muscle; from there, it could easily spread without being blocked by any biological barriers.
authors.affiliation: Department of Plastic Surgery, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan.
authors.forename: Tadashi
authors.initials: T
authors.lastname: Nomura
authors.affiliation: Department of Plastic Surgery, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan.
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Sakakibara
authors.affiliation: Department of Plastic Surgery, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan.
authors.forename: Aya
authors.initials: A
authors.lastname: Moriwaki
authors.affiliation: Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan.
authors.forename: Teruya
authors.initials: T
authors.lastname: Kawamoto
authors.affiliation: Division of Gastrointestinal Surgery, Department of Surgery, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Suzuki
authors.affiliation: Division of Urology, Department of Surgery Related, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Ishimura
authors.affiliation: Department of Plastic Surgery, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan.
authors.forename: Kazunobu
authors.initials: K
authors.lastname: Hashikawa
authors.affiliation: Department of Plastic Surgery, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan.
authors.forename: Hiroto
authors.initials: H
authors.lastname: Terashi
keywords: abdominal cavity; myxofibrosarcoma; rectus abdominis muscle