Point of obstruction

Differential diagnosis

Treatments available

Foramen of Monro

Tumor

Congenital absence

Ventriculitis

Functional

Shunt (unilateral or bilateral)

Endoscopic septum opening

Aqueduct of Sylvius

Tumor

Birth defect

Secondary

Shunt

Endoscopic third ventriculostomy

4th Ventricle foramina

Infection

Tumor

Severe Chiari Malformation

Shunt

Endoscopic third ventriculostomy

Surgical opening

Spinal to cortical subarachnoid space

Subarachnoid hemorrhage

Infection

Shunt (ventriculo- or lumboperitoneal)

Endoscopic third ventriculostomy

Arachnoid villi

Hemorrhage

Infection

Shunt (ventriculo- or lumboperitoneal)

Neuroendoscopic lavage

Venous hypertension

Pseudotumor

Congenital hydrocephalus

Sinus thrombosis

Shunt (ventriculo- or lumboperitoneal)

Clot lysis

Bariatric surgery for obesity-related pseudotumor