Osteoid osteoma

Osteoid osteomas are benign bone tumors. They consist of a highly vascular -supplied "core" ( nidus ), the compacted reactive growing from a rounded or spindle-shaped zone ( sclerotic ) mature bone tissue is surrounded. Preferably osteoid osteomas are located in the upper and lower leg bones. Exceeds the nidus size of 1.5 cm, the change is referred to as osteoblastoma.

About 14 percent of all bone tumors are osteoid osteomas. The tumor usually occurs between 10 and 20 years of age and three times more common in males. An occurrence before age 10 is possible, very rare after 30. Osteoid osteomas show symptoms in the form of local pain, which preferentially occur at night. Upon the occurrence in the spine osteoid osteomas can cause a curvature of the spine (scoliosis ).

The diagnosis is made by means of imaging techniques: X-ray, bone scan, CT and MRI (preferably as a dynamic examination with evidence of arterial contrast enhancement in well-vascularized nidus ).

Differential Diagnosis

List the differential diagnosis according Stäbler and Ertl -Wagner

• Enchondroma
• Osteoblastoma
• Not ossifying fibroma ( NOF )
• Stress response
• Stress Fracture
• Brodie 's abscess

Therapy

Treatment consists of surgical removal by open resection or percutaneous core biopsy or, preferably, CT-guided radiofrequency. Alternatively, it is also symptomatic treatment with aspirin or other NSAIDs in the presence of an osteoid osteoma, there is usually a healing of the disease is observed in a period of about 2-7 years.

When Osteoblastoma obtaining a tissue sample before removal is indicated.

In June 2008, the first MRI -guided laser ablation of osteoid osteoma of the fibula could be carried out in the open high-field MRI of the Charité in Berlin -Mitte.