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Osteoid osteoma

Case contributed by: Dr Ahmed Subaie

Presentation:

Back pain.

Patient Data:

Age: 41 years old
Gender: Female
Race: Middle eastern
Modality: MRI

This is a multi sequential MRI which shows focal area of low T1 and T2 signal intensity related to  sclerosis in the left pedicle of L5. There is a central area of high signal intensity within the sclerotic area which shows enhancement post contrast administration. Bone edema is also noted, especially on T2FS sequence.

Modality: CT

Focal area of sclerosis is noted in the left pedicle of 5th lumbar vertebra.

Case Discussion:

Osteoid osteoma is a benign bone lesion that usually present with pain especially at night that relieved by aspirin. 

  • On CT it is usually seen as a central sclerotic area, with lucency surrounding reactive bone formation.
  • On MRI the sclerotic area appears as low T1 and T2 signal intensities and the nidus is low on T1, high on T2 with enhancement post contrast administration.

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