305.A neurological case（part3）-Cerebral abscess

每天朗读一段医学影像学英语文章

Essential Facts：

· Bacterial infection of the brain evolves from cerebritis to capsule formation.

· Abscesses form when a capsule of granulation tissue, reinforced by a collagen wall, confines the infected area of brain and pus.

· Pathogens may enter the brain by hematogenous spread or direct extension of an infection (from the sinuses, mastoid processes, or ears). They may also be introduced following penetrating injury or surgery.

Other Imaging Findings：

· CT: The capsule appears as an isodense rim around a hypodense center with surrounding hypodense edema. The capsule enhances with contrast.

· MRI(T2WIs): the rim of an abscess is hypointense; this finding is the first to disappear after treatment.

· Diffusion-WIs: there is restricted diffusion with restriction on ADC maps.

· Spectroscopy shows increased levels of acetate, alanine and other amino acids, and lactate.

Notes:

1. granulation /ˌgrænjə'leʃən/ n. 使成粒状,有粒的表面,粗糙

2. pus /pʌs/ n. 脓

3. pathogen /'pæθədʒən/ n. 病菌,病原体

4. hematogenous /ˌhiməˈtɑdʒənəs/ adj. 造血的,血性的

5. acetate /'æsɪtet/ n. 醋酸盐；醋酸纤维素及其制成的产品

6. alanine /'ælənin/ n. [化]丙氨酸

7. lactate /læk'tet/ vi. (指哺乳动物)分泌乳汁 n. 乳汁分泌;哺乳(期)

来源：每天朗读一段医学影像学英语文章

圈主

深圳市人民医院放射科副主任医师杨敏洁

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