Osteoid osteoma mimicking monoarticular juvenile idiopathic arthritis in a girl.

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Osteoid osteoma mimicking monoarticular juvenile idiopathic arthritis in a girl.

Pediatr Int. 2016 Jun 21;

Authors: Massei F, Laccetta G, Barrani M, Fabbri L, Zampa V, Paolicchi A, Cioni R, Ciancia EM, Scaglione M, Consolini R

Abstract
Osteoid osteoma (OO) is a benign osteogenic neoplasm, usually affecting children and young adults, that is typically characterized by nocturnal pain and response to non-steroidal anti-inflammatory drugs. OO is frequently misdiagnosed because it mimics juvenile idiopathic arthritis (JIA), bone infection or malignancy. Herein we report the case of a girl who presented with chronic monoarthritis of the knee mimicking JIA. After 1 year, OO of the femoral distal metaphysis was diagnosed. OO was treated with computed tomography-guided radiofrequency ablation with disappearance of the symptoms and resolution of the neoplasm. No recurrences have been observed 3 years after the treatment. This case highlights that intra-articular or juxta-articular OO should be suspected in the case of misleading symptoms and signs, such as swelling, lack of typical pain and synovial thickening on ultrasound; needle biopsy of the lesion is necessary in the case of confusing imaging.

PMID: 27325304 [PubMed - as supplied by publisher]

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