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cavernous_malformation

Cavernous malformation

This hemangioma is classified as a group of vascular malformations, where a collection of dilated blood vessels form a tumor.

Hubert Luschka was the first to describe a cerebral (Cavernöse Blutgeschwulst) (cavernous malformation) in 1854.

Synonyms

The terms cavernoma, cavernous hemangioma, cavernous angioma, and cavernous malformation are used interchangeably and appear equally frequent in the literature. The terms cavernoma, cavernous angioma, and cavernous hemangioma suggest that it is a neoplastic lesion, which is inaccurate as cavernous malformations are true vascular malformations.

The term cavernous hemangioma is also confusing as cavernous hemangiomas in the cavernous sinus or in the orbit; both are slow-growing neoplastic diseases unrelated to vascular malformation

Classification

In 1928, Cushing and Bailey classified cavernous malformations as a solid subtype of hemangioblastomas 1)

see Intradiploic cavernous hemangioma

see Intracranial cavernous malformation

see Spinal epidural cavernous hemangioma

see Spinal cord cavernoma

Cavernous malformations (cavernous angiomas, cavernomas, cavernous hemangiomas) are well-defined, grossly visible lesions that may reach a significant size. They are composed of a compact mass of sinusoidal-type vessels immediately in apposition to each other without any recognizable intervening neural parenchyma.

Estimated prevalence between 0·4 and 0·9% 2), appearing mainly as singular supratentorial lesions 3).

Their biology is usually benign without changes in size, although the potential for growth and recurrent bleeding is well documented 4) 5) 6) 7) 8).

Etiology

Pathology

Cavernous malformation (CCM)s are benign, low-flow vascular lesions with thin elastic endothelial walls that lack adventitial smooth muscle and frequently present with little intervening brain parenchyma.

Microscopically, cavernous angiomas consist of sclerotic, variably calcified compact vessels in a honeycomb pattern.

Unlike telangiectasis and arteriovenous malformation these lesions do not contain interstitial parenchyma.

The cells that form the vessels do not form the necessary junctions with surrounding cells and the structural support from the smooth muscle is hindered causing leakage into the surrounding tissue.

Clinical features

It is the leakage of blood, known as a hemorrhage from these vessels that causes a variety of symptoms known to be associated with this disease.

Diagnosis

CMs were difficult to diagnose in the pre-MRI era. They are invisible on angiogram and thus the term AOVM (angiographically occult arteriovenous malformation) was sometimes used. However, the venous angioma sometimes seen in association with a CM was visible on angiogram, and thus believed to be the source of the hemorrhage seen, even though in reality it was the CM that had hemorrhaged. Thus, venous angiomas were sometimes treated, also with radiosurgery, a management that was soon aborted 9).

The introduction of MR imaging increased the number of diagnosed CMs as a CM that has hemorrhaged has a typical appearance on MR images (MRI). An unruptured CM cannot, however, be seen. Consequently, a CM diagnosed in a patient with an earlier normal MRI does not necessarily represent a denovo CM. It may be a CM that was present but invisible on an earlier scan that now can be seen due to an earlier hemorrhage with sequel signals depicted on MRI 10).

Treatment

1)
Cushing H, Bailey P (1928) Tumors arising from the blood-vessels of the brain. Charles C. Thomas, Springfield
2)
Bertalanffy H, Benes L, Miyazawa T, Alberti O, Siegel AM, Sure U. Cerebral cavernomas in the adult. Review of the literature and analysis of 72 surgically treated patients. Neurosurg Rev. 2002;25:1–53.
3)
Cappabianca P, Alfieri A, Maiuri F, Mariniello G, Cirillo S, de Divitiis E. Supratentorial cavernous malformations and epilepsy: seizure outcome after lesionectomy on a series of 35 patients. Clin Neurol Neurosurg. 1997;99:179–83.
4)
Dalyai RT, Ghobrial G, Awad I, Tjoumakaris S, Gonzalez LF, Dumont AS, et al. Management of incidental cavernous malformations: a review. Neurosurg Focus. 2011;31:E5.
5)
Kivelev J, Niemelä M, Hernesniemi J. Characteristics of cavernomas of the brain and spine. J Clin Neurosci. 2012;19:643–48.
6)
Pozzati E, Acciarri N, Tognetti F, Marliani F, Giangaspero F. Growth, subsequent bleeding, and de novo appearance of cerebral cavernous angiomas. Neurosurgery. 1996;38:662–9.
7)
Maiuri F, Cappabianca P, Gangemi M, De Caro Mdel B, Esposito F, Pettinato G, et al. Clinical progression and familial occurence of cerebral cavernous angiomas: the role of angiogenic and growth factors. Neurosurg Focus. 2006;21:e3.
8)
Gross BA, Lin N, Du R, Day AL. The natural history of intracranial cavernous malformations. Neurosurg Focus. 2011;30:E24.
9)
Lindquist C, Guo WY, Karlsson B, Steiner L (1993) Radiosurgery for venous angiomas. J Neurosurg 78:531–536
10)
Karlsson B, Wu B, Guo WY, Yeo TT. Pseudocavernoma-a new diagnosis? Acta Neurochir (Wien). 2018 Nov 17. doi: 10.1007/s00701-018-3735-1. [Epub ahead of print] PubMed PMID: 30448876.
cavernous_malformation.txt · Last modified: 2018/11/19 12:15 by administrador