title: [Postoperative computed tomography: study of 10 cases on reactive ring-enhancement in brain].
abstract: This paper presents 10 cases with CT appearances of postoperative reactive ring-enhancement in the brain, which were not reported in our country. The mechanisms and differential diagnosis of postoperative ring-enhancement are discussed with reports in the literature. The ring-enhancement at surgical margin is the reactive change of the brain traumatized by operation and related to postoperative pathological processes such as breakdown of blood-brain barrier, vascular granulation and luxury perfusion. This paper demonstrates that reactive ring-enhancement appears as early as 2-4 wk and may last as long as 7 wk after operation. It disappears gradually in 7 wk and cannot exist over 3 mon after operation. In the first 3 mon after operation, peripheral enhancement around the surgical site may be operative reaction, or residual tumor and cerebral abscess. The presence of ring-enhancement beyond 3 mon should be viewed as evidence of pathological process other than postoperative change. This paper emphasizes that ring-enhancement at margin of the surgical site with fine clinical manifestations in the early postoperative period is probably normal postoperative reaction. Close follow-up enhanced CT scan proves to be an effective measure to avoid misdiagnosis and unnecessary reexploration.
authors.forename: J H
authors.initials: JH
authors.lastname: Xiao
authors.forename: D Y
authors.initials: DY
authors.lastname: Wang
authors.forename: K H
authors.initials: KH
authors.lastname: Deng
mesh_terms: D000328:Adult; D001921:Brain / Q000000981:diagnostic imaging* / Q000601:surgery; D001927:Brain Diseases / Q000000981:diagnostic imaging / Q000601:surgery; D001932:Brain Neoplasms / Q000000981:diagnostic imaging* / Q000556:secondary / Q000601:surgery; D003937:Diagnosis, Differential; D005260:Female; D006406:Hematoma / Q000000981:diagnostic imaging / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D011184:Postoperative Period; D014057:Tomography, X-Ray Computed