Enostosis

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Osteopoikilie Haende

Enostosis

Enostosis, also known as a bone island, is a benign bone lesion characterized by a localized area of compact bone within the cancellous bone. It is typically an incidental finding on radiography and is usually asymptomatic.

Characteristics

Enostoses are composed of mature, compact bone and are often found in the long bones, pelvis, and spine. They appear as small, round, or oval areas of increased bone density on imaging studies. The size of an enostosis can vary, but they are generally less than 2 cm in diameter.

Diagnosis

Enostosis is most commonly diagnosed through imaging techniques such as X-ray, computed tomography (CT), or magnetic resonance imaging (MRI). On X-rays, enostoses appear as dense, sclerotic areas within the bone. CT scans provide more detailed images, confirming the presence of compact bone within the lesion. MRI can help differentiate enostosis from other bone lesions by showing the characteristic signal intensity of compact bone.

Differential Diagnosis

The differential diagnosis for enostosis includes other sclerotic bone lesions such as:

• Osteoma
• Osteoblastic metastasis
• Osteoid osteoma
• Bone infarct
• Sclerotic bone metastasis

Clinical Significance

Enostoses are generally considered benign and do not require treatment. However, it is important to differentiate them from other potentially malignant bone lesions. In rare cases, if an enostosis is symptomatic or shows atypical features, further evaluation and follow-up may be necessary.

Related Pages

• Bone
• Radiography
• Computed tomography
• Magnetic resonance imaging
• Osteoma
• Osteoid osteoma

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