CT is the first-line investigation for SAH. It has a high sensitivity, generally revealing diffuse blood of a symmetrical distribution around the basal cisterns, sylvian fissures and cortical sulci (Fig. 18.1). It detects acute SAH in 95% of patients within 48 hours and in 57% of cases at 5 days . When asymmetrical or localized, the distribution of blood may suggest the location of the aneurysm in up to 70% of cases. Intraventricular hemorrhage (IVH) is characteristic of ruptured ACOM artery aneurysms; ICH is most commonly seen with PCOM artery and MCA aneurysms. Following diagnosis, CT is particularly useful for demonstrating ventricular size, cerebral ischemia or infarction, mid-line shift or re-bleed.
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The term vaginitis is one that is applied to any inflammation or infection of the vagina, and there are many different conditions that are categorized together under this ‘broad’ heading, including bacterial vaginosis, trichomoniasis and non-infectious vaginitis.