title: Adult intramedullary ewing sarcoma of the proximal hip.
abstract: Ewing sarcoma of bone is classically a permeative lesion in the diaphysis of long bones in children. While they occur primarily in children and adolescents, they can be seen in young adults in their 20s, but these are typically seen in flat bones. The permeative nature of the lesion can elicit new bone formation creating a partially sclerotic appearance, cortical expansion presenting as a "Codman triangle," or have an "onion-skin" type of aggressive periosteal reaction/periostitis. Ewing sarcoma is rarely seen without an associated soft-tissue mass and is even rarer to just have benign-appearing periostitis (e.g., thick, uniform, or wavy cortex). We present such a case of Ewing sarcoma in a young adult confined to just the medullary metadiaphysis without cortical erosion or soft-tissue mass. To the best of our knowledge, this is the first case to be reported in the radiology literature.
authors.affiliation: Department of Radiology, Cooper University Hospital, Cooper Medical School of Rowan University, One Cooper Plaza B23, Camden, NJ 08103, USA.
authors.forename: Preetam
authors.identifier: 0000-0002-2196-9449
authors.initials: P
authors.lastname: Gongidi
authors.affiliation: Department of Radiology, Cooper University Hospital, Cooper Medical School of Rowan University, One Cooper Plaza B23, Camden, NJ 08103, USA.
authors.forename: Siva
authors.initials: S
authors.lastname: Jasti
authors.affiliation: Department of Pathology, Cooper University Hospital, Cooper Medical School of Rowan University, One Cooper Plaza B23, Camden, NJ 08103, USA.
authors.forename: William
authors.initials: W
authors.lastname: Rafferty
authors.affiliation: Department of Radiology, Cooper University Hospital, Cooper Medical School of Rowan University, One Cooper Plaza B23, Camden, NJ 08103, USA.
authors.forename: Veniamin
authors.identifier: 0000-0001-5148-8956
authors.initials: V
authors.lastname: Barshay
authors.affiliation: MD Anderson Cancer Center at Cooper Orthopedic Oncology Center, Cooper University Hospital, Cooper Medical School of Rowan University, One Cooper Plaza, B23, Camden, NJ 08103, USA.
authors.forename: Richard
authors.initials: R
authors.lastname: Lackman