Case No. 25: Giant Pontine Cavernoma
Report Of Giant Pontine Cavernoma:
The CT brain without contrast reveals a tumor lesion localized in the pons and extending to the left cerebral pedicle. The lesion appears inhomogeneous because of the coexistence of hyper- and hypoattenuating areas. The adjacent perifocal edema was compressing the 4th ventricle without causing hydrocephalus.
Giant Pontine Cavernoma
Non-neoplastic vascular malformations of the central nervous system are categorized into four types:
- Arteriovenous malformations
- Venous angiomas
- Capillary telangiectasias
- Cavernous malformation
On imaging, these lesions may be misdiagnosed as arteriovenous malformations or high grade gliomas. MRI is extremely helpful in the diagnosis of cavernous angiomas. The characteristic appearance on MRI is a mixed signal intensity on T2-weighted images resulting from blood products of various stages surrounded by a rim of decreased signal intensity, representing the continuous hemosiderin rim visible in T2 sequences. Typically, they appear as popcorn-like, well-circumscribed lesions.