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Cavernous liver haemangioma
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Cavernous liver haemangioma : ウィキペディア英語版
Cavernous liver haemangioma

A cavernous liver haemangioma or hepatic haemangioma is a benign tumour of the liver composed of hepatic endothelial cells. It is the most common liver tumour, and is usually asymptomatic and diagnosed incidentally on radiological imaging. Liver haemangiomas are thought to be congenital in origin.〔Baron R. ('Liver: Masses Part I: detection and characterization' ). The Radiology Assistant 2006〕 Several subtypes exist, including the giant hepatic haemangioma, which can cause significant complications.
==Diagnosis==

Liver haemangiomas are typically hyperechoic on ultrasound though may occasionally be hypoechoic; ultrasound is not diagnostic. Computed tomography (CT),〔Brodsky RI, Friedman AC, Maurer AH et-al. Hepatic cavernous hemangioma: diagnosis with 99mTc-labeled red cells and single-photon emission CT. ''AJR Am J Roentgenol''. 1987;148 (1): 125-9. PMID 3491500〕 magnetic resonance imaging (MRI)〔Vilanova JC, Barceló J, Smirniotopoulos JG et-al. Hemangioma from head to toe: MR imaging with pathologic correlation. ''Radiographics''. 24 (2): 367-85. PMID 15026587 〕 or single-photon emission computed tomography (SPECT) is diagnostic. Biopsy is avoided due to the risk of haemorrhage.
Hepatic haemangiomas can occur as part of a clinical syndrome, for example Klippel-Trenaunay-Weber syndrome, Osler–Weber–Rendu syndrome and Von Hippel-Lindau syndrome.

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