Bizarre Parosteal Osteochondromatous Proliferation: Nora's Lesion

AUTHORS

S Chaabane 1 , Mouna Chelli Bouaziz 2 , * , K H Ben Ghars 1 , L Abid 3 , M H Jaafoura 4 , M F Ladeb 2

1 Department of Radiology, Institut Kassab d’orthopédie, Ksar Said, Tunisia

2 Professor, Department of Radiology, Institut Kassab d’orthopédie, Ksar Said, Tunisia

3 Department of Pathology, Institut Kassab d’orthopédie, Ksar Said, Tunisia

4 Professor, Department of Pathology, Institut Kassab d’orthopédie, Ksar Said, Tunisia

How to Cite: Chaabane S, Chelli Bouaziz M, Ben Ghars K H, Abid L, Jaafoura M H, et al. Bizarre Parosteal Osteochondromatous Proliferation: Nora's Lesion, Iran J Radiol. 2011 ; 8(2):e93940.

ARTICLE INFORMATION

Iranian Journal of Radiology: 8 (2); e93940
Published Online: June 30, 2011
Article Type: Case Report
Received: May 18, 2019
Accepted: June 30, 2011

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Abstract

The purpose of this study was to review the imaging and anatomopathologic findings and to discuss the main differential diagnosis of bizarre parosteal osteochondromatous proliferation (BPOP) or Nora's lesion, a rare benign surface lesion of the bone. Plain radiographs, ultrasound, CT and MRI images of four patients with BPOP, histologically confirmed, were obtained and retrospectively reviewed. Three cases involving the hand and one involving the foot are reported. On plain radiographs, BPOP is a well-marginated, calcified or ossified mass arising directly from the cortical surface of the underlying bone. Ultrasound images show a low echoic peripheral cap around the lesion. CT images show the wide base of the lesion. On MRI, BPOP was of a low signal on T1, enhancing following gadolinium administration. Underlying bone and adjacent surrounding soft tissues were normal.

Keywords

Parosteal Osteochondroma Bone Radiography Ultrasound CT MRI

© 2011, Author(s). This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/) which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited.

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