title: Ewing's sarcoma of the patella.
abstract: Ewing's sarcoma is a relatively rare malignancy, occurring mainly between 4 and 25 years of age. It usually arises from the pelvis, followed by the femur, tibia, and remainder of both the long bones of the extremities and flat bones of the axial skeleton. To the best of our knowledge, Ewing's sarcoma of the patella has never been reported previously. Patellar tumors occur infrequently and represent an uncommon etiology of anterior knee pain. We describe the rare case of a 41-year-old man who presented with a 3-4 month history of escalating right anterior knee pain and swelling. Imaging demonstrated an aggressive patellar tumor with an adjacent soft tissue mass. The diagnosis of Ewing's sarcoma was confirmed by pathology. Physicians should be aware of atypical locations for Ewing's sarcoma and, conversely, of rare tumors arising in the patella and accounting for anterior knee pain. Early recognition of such malignancies allows prompt initiation of treatment, hence improving prognosis.
authors: Faculty of Medicine, McGill University, Montreal, QC, Canada. natalia.gorelik@mail.mcgill.ca
authors: Natalia
authors: N
authors: Gorelik
authors: Brendan C
authors: BC
authors: Dickson
authors: Jay S
authors: JS
authors: Wunder
authors: Robert
authors: R
authors: Bleakney
mesh_terms: D000328:Adult; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000008:administration & dosage; D001859:Bone Neoplasms / Q000175:diagnosis* / Q000628:therapy*; D006801:Humans; D008175:Lung Neoplasms / Q000556:secondary / Q000628:therapy; D008297:Male; D010329:Patella; D012512:Sarcoma, Ewing / Q000175:diagnosis* / Q000628:therapy
references: Eur J Cancer. 2011 Sep;47 Suppl 3:S366-7
references: 21944018
references: Eur Radiol. 2009 Mar;19(3):701-12
references: 18815789
references: Skeletal Radiol. 1989;18(5):365-71
references: 2781339
references: Am J Health Syst Pharm. 2010 Oct 1;67(19):1599-605
references: 20852160
references: Lancet Oncol. 2010 Feb;11(2):184-92
references: 20152770
references: Ups J Med Sci. 2012 Aug;117(3):342-6
references: 22200101
references: Pediatr Hematol Oncol. 2012 Feb;29(1):1-11
references: 22295994
references: Jpn J Clin Oncol. 2007 Feb;37(2):79-89
references: 17272319
references: J Knee Surg. 2008 Jul;21(3):212-6
references: 18686483
references: Clin Orthop Relat Res. 2001 Aug;(389):35-46
references: 11501820
references: Acta Orthop Belg. 2008 Jun;74(3):391-6
references: 18686467
references: Mod Pathol. 2006 Jan;19(1):1-8
references: 16258512
references: Skeletal Radiol. 2009 Aug;38(8):741-9
references: 19407996
references: Clin Orthop Relat Res. 1997 Mar;(336):199-204
references: 9060506
references: Cancer. 2007 Feb 15;109(4):780-6
references: 17219445