Neuroanatomy Atlas in Clinical Context

THE CHOROID PLEXUS: LOCATIONS, BLOOD SUPPLY, TUMORS 75

A

B

C

Tumor in atrium

Blood in posterior horn

Blood in temporal horn

D

E

F

Tumor in third ventricle

Tumor in atrium

coronal ( E ), and sagittal ( F ) planes. The tumor in A – C is from the same patient and shows the lesion in the area of the atrium of the lateral ventri cle on the left ( A ) with bleeding from the tumor into the posterior and temporal horns of the lateral ventricle on the same side ( B, C ). Note the enlarged ventricles ( A – C ). The image in D shows a large tumor originat ing from the choroid plexus in the roof of the third ventricle. This tumor has partially obstructed the interventricular foramina, with consequent enlargement of the lateral ventricles. Images E and F are of patients with tumors in the glomus choroideum ( choroid glomus or choroid enlarge ment ) of the choroid plexus of the lateral ventricle. Images A – C are CT and D – F are MRI with enhancement of the tumor. Copyright © Wolters Kluwer, Inc. Unauthorized reproduction of the content is prohibited. 2024

4-15 Tumors of the choroid plexus (CP) constitute about 1% of all intracranial tumors and are generally classified as choroid plexus papilloma (benign, most common of CP tumors) or choroid plexus carcinoma (malignant, rare). These tumors are most commonly seen in children younger than 2 years, located supratentorially, and may present with symptoms/signs of increased intracranial pressure ( nausea/vomiting, lethargy, headache, enlarged ventricles, craniomegaly, or macrocephaly). In adults these tumors are more common infratentorially. The CP is highly vascularized; consequently, tumors of this structure may bleed into the ventricular space ( intraventricular hemorrhage ) and create a cast outlin ing its shape. Examples of tumors of the choroid plexus in axial ( A – D ),