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TRANSFORMATION OF AN OSTEOID OSTEOMA OF T2 VERTEBRA INTO AN OSTEOBLASTOMA AFTER RADIOFREQUENCY ABLATION – A RARE OCCURRENCE - A CASE REPORT AND LITERATURE REVIEW

Shah A.1, Marshall T. 2, Anwar H. 1, Butt S. 1

1- Royal National Orthopaedic Hospital. Stanmore, United Kingdom.

2 - Norfolk and Norwich University Hospital. Norwich, United Kingdom.

We present a case of a young caucasian male who had a typical presentation of an osteoid osteoma at T2 level with characteristic imaging features of a small nidus on cross-sectional imaging in the left T2 pedicle. An elective, uncomplicated CTguided radiofrequency themoablation was performed at the presenting hospital. Within four weeks, he represented with recurrent symptoms and repeat imaging at eight weeks demonstrated a large expansile and aggressive lesion at the previous site with aneurysmal bone cyst formation. A needle biopsy confirmed a diagnosis of osteoblastoma which was treated with en-bloc resection (hemivertebrectomy) at the regional bone tumour centre. We propose that the primary lesion was indeed an osteoid osteoma due to its typical imaging features. The subsequent imaging characteristics of the lesion were consistent with an osteoblastoma rather than a simple recurrence. Osteoblastomic transformation of osteoid osteomas has been described previously in literature in both axial and appendicular skeleton but never within such a short period after thermocoagulation. This rare occurrence should be considered and would warrant imaging surveillance particularly with worsening clinical features by clinicians managing this condition.

Keywords: osteoblastoma (OB), osteoid osteoma (OO), radiofrequency ablation (RFA).


 

Corresponding author: : Sajid Butt, Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript

 

For citation: For citation: Shah A., Marshall T., Anwar H., Butt S. Transformation of an osteoid osteoma of T2 vertebra into an osteoblastoma after radiofrequency ablation – a rare occurrence - a case report and literature review. REJR. 2016; 6 (4):128-133. DOI:10.21569/2222-7415-2016- 6-4-128-133.

 

Received: 26.08.2016 Accepted: 12.09.2016