title: Usefulness of PET/CT for diagnosis of periosteal chondrosarcoma of the femur: A case report.
abstract: Periosteal chondrosarcoma is an extremely rare low-grade malignant cartilaginous tumor arising from the external bone surface. Diagnosis of periosteal chondrosarcomas may be challenging, since this condition closely resembles periosteal chondromas. It has been reported that positron emission tomography (PET) is useful in distinguishing benign from malignant cartilaginous tumors using a maximum standardized uptake value (SUVmax) cut-off of 2.0 or 2.3. This report presents the case of a 40-year-old female with an 18-month history of a tender mass in the left distal femur. Radiological findings demonstrated periosteal buttressing. Magnetic resonance imaging (MRI) revealed a chondrogenic tumor of 3 cm in size developing from the external bone surface. It was difficult to differentiate periosteal chondrosarcoma from periosteal chondroma on the basis of size and the radiological and MRI findings. PET/computed tomography (CT) revealed abnormal linear uptake with an SUVmaxof 2.7, indicating a malignant tumor. A diagnosis of periosteal chondrosarcoma was made, and wide resection was performed. Tumor histology was consistent with grade II chondrosarcoma. PET/CT is thus useful in differentiating periosteal chondrosarcoma from periosteal chondroma.
authors.affiliation: Department of Orthopedic Surgery, Hyogo College of Medicine, Nishinomiya, Hyogo 663-8501, Japan.
authors.forename: Shota
authors.initials: S
authors.lastname: Morimoto
authors.affiliation: Department of Orthopedic Surgery, Hyogo College of Medicine, Nishinomiya, Hyogo 663-8501, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Futani
authors.affiliation: Department of Orthopedic Surgery, Hyogo College of Medicine, Nishinomiya, Hyogo 663-8501, Japan.
authors.forename: Konan
authors.initials: K
authors.lastname: Tsuchiyama
authors.affiliation: Department of Orthopedic Surgery, Hyogo College of Medicine, Nishinomiya, Hyogo 663-8501, Japan.
authors.forename: Satoru
authors.initials: S
authors.lastname: Fukunaga
authors.affiliation: Department of Pathology, Hyogo College of Medicine, Nishinomiya, Hyogo 663-8501, Japan.
authors.forename: Yoshitane
authors.initials: Y
authors.lastname: Tsukamoto
authors.affiliation: Department of Orthopedic Surgery, Hyogo College of Medicine, Nishinomiya, Hyogo 663-8501, Japan.
authors.forename: Shinichi
authors.initials: S
authors.lastname: Yoshiya
keywords: PET; chondrosarcoma; imaging; periosteal tumor