[Reangiography after perimesencephalic subarachnoid hemorrhage]

Area of Science:

• Neurology
• Radiology
• Vascular Imaging

Background:

• Perimesencephalic subarachnoid hemorrhage (SAH) diagnosis often involves initial negative noninvasive and invasive neurovascular imaging.
• Digital subtraction angiography (DSA), computed tomography angiography (CTA), and magnetic resonance angiography (MRA) are common diagnostic tools.

Purpose of the Study:

• To evaluate the diagnostic yield of repeated DSA in identifying causative vascular lesions.
• To assess the clinical significance of findings from repeated DSA in perimesencephalic SAH patients.

Main Methods:

• A retrospective analysis of 750 SAH patients over 10 years.
• Focused on 30 patients with perimesencephalic SAH and initially negative neurovascular imaging.
• Assessed the value of repeat DSA for lesion detection.

Main Results:

• Repeated DSA identified a causative vascular lesion in only 1 patient (3.3%).
• No lesions were detected in the remaining patients undergoing repeat DSA.

Conclusions:

• Repeated DSA is valuable in rare perimesencephalic SAH cases with initially negative imaging.
• Detecting a hemorrhage source, particularly posterior circulation aneurysms, has significant therapeutic and prognostic implications.
• Repeat DSA is recommended despite complication risks due to its potential impact on patient management.