1.**Cavity of lateral ventricles** (**Figures 2** and **3**) **in this space, we must identify:**

a. Foramen of Monro.

**Figure 2.** *Lateral ventricles, supraforaminal view.*

**Figure 3.** *View through Monroe's foramen.*


In the ventricular cavity, it is advisable to initially identify the choroid plexus, which is the most reliable landmark for finding Monroe's foramen, since in some cases said foramen is not evident, due to some anatomical variant (**Table 2**).
