The choroid plexuses are convoluted arteriovenous vascular complexes in the cerebral ventricles, composed of specialized glial cells and producing cerebrospinal fluid.
Anatomy
Choroid plexuses are found in the lateral ventricles and in the roof of the third and fourth ventricle. At the lateral end of the fourth ventricle, part of the choroid plexus protrudes bilaterally through the Foramen of Luschka. This part is referred to as Bochdalek's flower basket. The choroid plexus of the lateral ventricles is connected to that of the third ventricle via the interventricular foramen. Its site of attachment to the thalamus is called the Taenia choroidea. The anterior and posterior horns of the lateral ventricles are devoid of choroid plexus. This is anatomically relevant for intraoperative orientation during intraventricular procedures.
Tumors
Tumors arising from the choroid plexus are referred to as choroid plexus tumors. In most cases, these are benign Choroid plexus papillomas (WHO Grade 1). Other, more aggressive choroid plexus tumors include atypical choroid plexus papilloma (WHO Grade 2) and Choroid plexus carcinomas (WHO Grade 3)[^1].
Imaging
Depending on its extent, the choroid plexus may be visible on CT as well as MRI imaging.
