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29.01.2018 | CASE REPORT

Pseudomalignant osteoblastoma of the odontoid process

verfasst von: Pedro Fernandes, Joaquim Soares do Brito, Adília Costa, Jacinto Monteiro

Erschienen in: European Spine Journal | Sonderheft 3/2018

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Abstract

Introduction

The anterior elements of the spine, particularly the odontoid processes, are a rare location for osteoblastomas. Pseudomalignant osteoblastomas are themselves rare histologic types and are also extremely rare in this location. Most osteoblastomas are Enneking stage 2 lesions; less frequently, they can be more aggressive with extra-capsular extension (Enneking stage 3). En bloc resection is recommended for aggressive lesions, but the literature is less clear regarding the approach to stage 2 tumors, particularly those with pseudomalignant histologic features.

Case report

A 6-year-old male child presented with a type III pathologic fracture of the odontoid. The fracture healed but upon 6-month follow-up CT scanning, an expansile lesion was detected. Surgical biopsy revealed an osteoblastoma which was treated with intralesional excision. Meanwhile, the excised specimen showed histological features of a pseudomalignant osteoblastoma. Despite this diagnosis, no further treatment was undertaken. At a 10-year follow-up, the patient was free from pain and had full range of motion of the cervical spine; no recurrence was detected.

Conclusion

This unique case of odontoid osteoblastoma illustrates that malignant behavior may not be predicted only by the presence of pseudomalignant features on histology.
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Metadaten
Titel
Pseudomalignant osteoblastoma of the odontoid process
verfasst von
Pedro Fernandes
Joaquim Soares do Brito
Adília Costa
Jacinto Monteiro
Publikationsdatum
29.01.2018
Verlag
Springer Berlin Heidelberg
Erschienen in
European Spine Journal / Ausgabe Sonderheft 3/2018
Print ISSN: 0940-6719
Elektronische ISSN: 1432-0932
DOI
https://doi.org/10.1007/s00586-018-5500-9

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