[jcreinhold]

For people not familiar with what a healthy brain looks like in a CT image, here [1] is a reference.

Fig. A in the original post corresponds to the same view (axial) of the brain as shown in the first image in [1].

The dark cashew-shaped blobs in the center of the healthy image in [1] correspond to what's labeled LV (for "lateral ventricles") in the original post. These cavities are filled with a fluid called cerebrospinal fluid (CSF) which serves to protect and clear waste from the brain.

Other examples of enlarged ventricles can be found, e.g., with a disease called normal pressure hydrochephalus (NPH) (example here: [2]).

So, needless to say, this case of ventricular enlargement is extremely severe, even compared to NPH.

[1] https://radiopaedia.org/cases/normal-ct-brain

[2] https://i1.wp.com/myneurosurg.com/wp-content/uploads/2017/11...