The choroidal fissure is a narrow opening in the brain where the choroid plexus enters the ventricular system. It is also known as the choroidal sulcus, and sometimes referred to as the lateral cerebral fissure. Other synonyms for the choroidal fissure include the transverse fissure and the ventral choroidal fissure. These terms describe the same anatomical structure, which runs along the lateral aspect of the brain. The choroidal fissure is an important area for neurosurgeons, who may need to access it during certain procedures. Understanding these different terms can help medical professionals communicate more effectively about this critical area of the brain.