Radiological Findings in Cavernoma

MRI Characteristics

The American College of Radiology recommends T1-weighted imaging to show variable signal intensity depending on the age of blood products, with hyperintense signals indicating subacute hemorrhage (methemoglobin) 1, 2
T2-weighted gradient-echo imaging or susceptibility-weighted imaging (SWI) is superior to standard spin-echo sequences for detecting cavernomas, particularly smaller lesions and multiple cavernomas not visible on conventional imaging 3, 4

Cavernomas are typically angiographically occult due to sluggish blood flow through thin-walled sinusoidal spaces without arteriovenous shunting, according to the American Heart Association 1, 2

Deeply situated cavernomas (basal ganglia, thalamus, brainstem) are more likely to bleed than superficial lesions, as stated by the American Stroke Association 1, 2

The American College of Radiology advises against relying solely on standard MRI sequences—gradient-echo or SWI sequences are essential for detecting multiple lesions and smaller cavernomas that may be missed on spin-echo imaging 3
The World Federation of Neurosurgical Societies recommends avoiding including the hemosiderin rim in treatment planning for radiosurgery, as it may potentiate radiation effects and increase risk of adverse events 5
Consider associated developmental venous anomalies (DVAs) in 20% of cases, as most hemorrhage in DVA patients is attributed to associated cavernomas rather than the DVA itself, according to the American College of Radiology 3, 4

The American College of Radiology (ACR) explicitly states that CTA/CTV is indicated for high-flow vascular lesions like aneurysms and arteriovenous malformations, not for low-flow lesions like cavernomas 6, 7
Brain CT venogram (CTV) is not useful for diagnosing or managing cavernoma, as these lesions are low-flow vascular malformations that are inherently "occult" or "cryptic" on angiographic studies including CTV 6