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Polish Journal of Pathology
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3/2016
vol. 67
 
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Post-traumatic fibro-osseous lesion of the rib

Elizaveta Chernetsova
1
,
Mofeedah Al Shammary
2
,
Dina El Demellawy
1, 2, 3

1.
Department of Pathology and Laboratory Medicine, University of Ottawa, Ottawa, Ontario, Canada
2.
University of Ottawa, Ottawa, Ontario, Canada
3.
Children’s Hospital of Eastern Ontario, University of Ottawa, Ottawa, Ontario, Canada
Pol J Pathol 2016; 67 (3): 301-303
Online publish date: 2016/11/25
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Post-traumatic fibro-osseous lesion of the rib (PTFOL) is a rare lesion that is most commonly noted incidentally. Ten incidence of PFOL is unknown but it is thought that it is underdiagnosed, as many of the cases are misdiagnosed as fibrous dysplasia. This could be attributed to the lack of familiarity of the lesion by radiologists, pathologists and orthopedic surgeons. PFOL is regarded as a reactive bony lesion which in most incidences is related to trivial trauma. However, in many of the reported cases similar to our case, no history of trauma is identified. It clinically, radiologically and sometimes histologically overlaps with some boney lesions including osteoid osteoma, fibrous dysplasia, Erdheim-Chester disease and eosinophilic granuloma (Table I). PFOL usually presents as well-defined nodule (Fig. 1) composed of intervening bland fibrous stroma and xanthomatous component (Fig. 2).
Our case interestingly showed significant xanthomatous component. The histological pattern of the lesion whether predominantly xanthomatous versus fibrotic has no clinical significance. The key histological feature of PFOL is transformation of anastomosing network of woven bony trabeculae (Fig. 3) noted centrally to mature lamellar bone noted peripherally which continue with the cortical bone (Fig. 4).
Most patients with PFOL show no recurrence and there is a controversy in the literature as regards their management, whether the lesion should be left and followed by imaging or it should be excised to rule out a more worrisome lesion, that may overlap clinically and on imaging. Our patient was well and did not show lesional recurrence, during the 7 years follow up period.

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Address for correspondence

Dina El Demellawy
University of Ottawa
Children’s Hospital of Eastern Ontario
401 Smyth Road Ottawa, ON K1H 8L1
tel. (613) 737-7600 x3846
fax (613) 738-4837
e-mail: deldemellawy@cheo.on.ca
Copyright: © 2016 Polish Association of Pathologists and the Polish Branch of the International Academy of Pathology This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) License (http://creativecommons.org/licenses/by-nc-sa/4.0/), allowing third parties to copy and redistribute the material in any medium or format and to remix, transform, and build upon the material, provided the original work is properly cited and states its license.
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