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Osteoid osteoma: MR imaging revisited.

A R Spouge¹, L M Thain

¹Department of Diagnostic Radiology, London Health Sciences Centre, University Campus, 339 Windermere Road, N6A 5A5, London, Ontario, Canada. aspouge@julian.uwo.ca

Clinical Imaging

|December 20, 2000

Summary

Magnetic resonance (MR) imaging accurately detects osteoid osteomas, outperforming computed tomography (CT) in some cases. MR imaging reveals key features of these bone tumors, aiding diagnosis.

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Osteoid osteoma: MR imaging of two untreated lesions.

Clinical imaging·2000

Area of Science:

Radiology
Orthopedic Imaging
Oncology

Background:

Osteoid osteoma is a benign bone tumor.
Diagnosis can be challenging with conventional imaging.

Purpose of the Study:

Compare magnetic resonance (MR) imaging and computed tomography (CT) performance for osteoid osteoma detection.
Identify characteristic MR imaging features of osteoid osteoma.

Main Methods:

Retrospective review of MR images from 10 patients with confirmed osteoid osteoma.
Assessment of nidus, bone marrow, and soft tissue edema on MR.
Correlation with patient age, symptom duration, and treatment.

Main Results:

MR imaging correctly diagnosed all 10 osteoid osteomas.
CT showed false negatives in two extracortical lesion cases.
Nidus appearance on MR varied; marrow edema enhanced nidus conspicuity.

Conclusions:

MR imaging is highly effective for diagnosing osteoid osteoma.
MR imaging demonstrates characteristic features, including variable nidus appearance and surrounding edema.
CT may miss osteoid osteomas in cancellous locations.

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