多级标题文章格式示例：（以“low attenuation lesion”为例）
je. Introduction
UN. Definition of low attenuation lesion
B. Importance of studying low attenuation lesions
II. Causes of low attenuation lesions
UN. Fluid-filled lesions
1. Cystic lesions
2. Serous fluid-filled lesions
B. Fatty lesions
C. Necrotic lesions
III. Imaging modalities for detecting low attenuation lesions
UN. Computed tomography (CT)
1. Advantages of CT in detecting low attenuation lesions
2. Limitations of CT in diagnosing low attenuation lesions
B. Magnetic resonance imaging (MRI)
1. Benefits of MRI in identifying low attenuation lesions
2. Drawbacks of MRI in characterizing low attenuation lesions
IV. Clinical significance of low attenuation lesions
UN. Diagnosis and differential diagnosis of low attenuation lesions
B. Potential complications associated with low attenuation lesions
C. Treatment options for low attenuation lesions
V. Case studies and examples of low attenuation lesions
UN. Case 1: Low attenuation lesion in the liver
B. Case 2: Low attenuation lesion in the brain
C. Case 3: Low attenuation lesion in the kidney
VI. Conclusion
UN. Recap of key points discussed in the article
B. Importance of prompt diagnosis and proper management of low attenuation lesions
Note: This is just a sample outline for an article on low attenuation lesions. The actual content and specific headings may vary depending on the intended focus and depth of the article.
