WordNet

a three-sided polygon (同)trigon, trilateral
something approximating the shape of a triangle; "the coastline of Chile and Argentina and Brazil forms two legs of a triangle"
a percussion instrument consisting of a metal bar bent in the shape of an open triangle
any of various triangular drafting instruments used to draw straight lines at specified angles

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三角形 / 三角形の物 / 《米》三角定規 / (楽器の)トライアングル / 三つ組,三人組;(男女の)三角関係

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/12/27 12:38:17」(JST)

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Codman triangle (previously referred to as Codman's triangle) is the triangular area of new subperiosteal bone that is created when a lesion, often a tumour, raises the periosteum away from the bone. ^[1] A Codman triangle is not actually a full triangle. Instead it is often a pseudotriangle on radiographic findings with ossification on the original bone and one additional side of the triangle which forms a two sided triangle with one open side. This two sided appearance in generated due to a tumor (or growth) that is growing at a rate which is faster than the periosteum can grow or expand, so instead of dimpling, the periosteum tears away and provides ossification on the second edge of the triangle. ^[2]

The main causes for this sign are osteosarcoma, Ewing's sarcoma, eumycetoma, and a subperiosteal abscess.^[3]^[4]

References[edit]

^ General Practioner's notebook
^ Periosteal Reaction
^ Periosteal Ewing sarcoma
^ Imaging in Classic Osteosarcoma

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UpToDate Contents

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1. 骨肉腫：疫学、病因、臨床症状、診断、および組織学的検査 osteosarcoma epidemiology pathogenesis clinical presentation diagnosis and histology
2. ユーイング肉腫ファミリーの腫瘍の臨床症状、病期分類、および予後因子 clinical presentation staging and prognostic factors of the ewing sarcoma family of tumors
3. 骨腫瘍：診断および生検法 bone tumors diagnosis and biopsy techniques
4. 頭頸部皮膚切除における解剖学的危険部位 anatomic danger zones in cutaneous surgery of the head and neck
5. 女性泌尿生殖器の外科解剖学 surgical female urogenital anatomy

English Journal

Distinguishing Osteomyelitis From Ewing Sarcoma on Radiography and MRI.

McCarville MB1,2, Chen JY3, Coleman JL1, Li Y4, Li X4, Adderson EE5,6, Neel MD7, Gold RE1,2, Kaufman RA1,2,6.
AJR. American journal of roentgenology.AJR Am J Roentgenol.2015 Sep;205(3):640-50; quiz 651. doi: 10.2214/AJR.15.14341.
OBJECTIVE: The purpose of this study was to determine whether clinical and imaging features can distinguish osteomyelitis from Ewing sarcoma (EWS) and to assess the accuracy of percutaneous biopsy versus open biopsy in the diagnosis of these diseases.MATERIALS AND METHODS: Three radiologists reviewe
PMID 26295653

Central odontogenic fibroma (simple type) in a four-year-old boy: atypical cone-beam computed tomographic appearance with periosteal reaction.

Anbiaee N1, Ebrahimnejad H1, Sanaei A1.
Imaging science in dentistry.Imaging Sci Dent.2015 Jun;45(2):109-15. doi: 10.5624/isd.2015.45.2.109. Epub 2015 Jun 19.
Central odontogenic fibroma (COF) is a rare benign tumor that accounts for 0.1% of all odontogenic tumors. A case of COF (simple type) of the mandible in a four-year-old boy is described in this report. The patient showed asymptomatic swelling in the right inferior border of the lower jaw for one we
PMID 26125006

Adult intramedullary ewing sarcoma of the proximal hip.

Gongidi P1, Jasti S1, Rafferty W2, Barshay V1, Lackman R3.
Case reports in radiology.Case Rep Radiol.2014;2014:916935. doi: 10.1155/2014/916935. Epub 2014 Jun 12.
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 b
PMID 25024862