Cerebral venous malformation-arteriovenous malformation transition forms

Area of Science:

• Vascular Malformations
• Neuroscience
• Developmental Biology

Background:

• Cerebral venous malformations (CVMs) are complex vascular anomalies.
• Arteriovenous malformations (AVMs) are another type of cerebrovascular abnormality.
• Understanding the relationship between CVMs and AVMs is crucial for diagnosis and treatment.

Purpose of the Study:

• To present cases illustrating the characteristic triad of CVMs.
• To demonstrate the association of this triad with arterial fistulization in AVMs.
• To postulate a unified developmental theory for CVMs and AVMs.

Main Methods:

• Case series presentation of seven patients with cerebral vascular malformations.
• Detailed description of imaging findings, focusing on venous drainage patterns and arterial involvement.
• Comparative analysis of structural features between CVMs and AVMs.

Main Results:

• Three cases exemplified the CVM triad: abnormal surface venous drainage, deep 'star-cluster' veins, and a deep draining vein.
• Four additional cases showed the CVM triad with arterial fistulization, consistent with AVMs.
• One case presented a CVM within an AVM, sharing a common draining vein and venous core.

Conclusions:

• Arteriovenous malformations (AVMs) are proposed to be a fistulized form of cerebral venous malformations (CVMs).
• Both CVMs and AVMs may result from a common developmental failure in the cortical venous mantle.
• This unified hypothesis offers a new perspective on the pathogenesis of these cerebrovascular lesions.