[Arteriovenous malformation associated with cyst. Case report].

Area of Science:

• Neurology
• Radiology
• Pathology

Background:

• Arteriovenous malformations (AVMs) are complex vascular anomalies.
• Cyst formation adjacent to AVMs is a rare occurrence.
• Understanding the pathogenesis of these cysts is crucial for patient management.

Observation:

• The study details the fifth reported case of AVM with associated cyst formation.
• Computed tomography (CT) revealed two distinct cyst morphologies: round and slit-like.
• Slit-like cysts were characterized by low density on CT imaging.

Findings:

• Three patients with slit-like cysts presented with sudden, severe headaches, indicative of potential hemorrhage.
• Two patients with round cystic lesions did not report sudden headaches.
• Surgical examination of round cysts revealed the presence of a mural nodule.

Implications:

• The findings suggest two distinct mechanisms for cyst formation near AVMs: hemorrhage for slit-like cysts and exudation for round cysts.
• Differentiating cyst types may aid in predicting clinical presentation and AVM-related complications.
• Further research is warranted to elucidate the precise mechanisms and clinical significance of AVM-associated cysts.