Version July 2025
(A-D) CT and CTA of a 47-year-old woman nine hours after ictus demonstrating a PM-NASAH.
(E-H) CT and CTA of a 62-year-old man seven hours after ictus demonstrating a PM-NASAH with blood in front of the medulla oblongata (arrow).
(I-L) CT and CTA of a 49-year-old woman 14 hours after ictus to illustrate a PM-NASAH with sedimentation of blood in the lateral horns (dashed arrows).
(M-P) CT of a 66-year-old man 16 hours after ictus showing a PM-NASAH with the perimesencephalic cisterns filled with blood and associated hydrocephalus (M and N). CT on day seven after ictus showing a spontaneous decrease of hydrocephalus (O). CTA at time of presentation did not show an aneurysm (P).
(Q-T) sagittal CT of a 47-year-old man four hours after ictus showing a PM-NASAH with distribution of blood in front of the brain stem and in the ambient cisterns.