小型肝血管瘤在雙相迴旋型電腦斷層攝影中的表現

肝血管瘤會在雙相迴旋型電腦斷層攝影中表現三類特殊的顯影模式，第一類為點狀顯影，第二類為先在周圍出現點狀或團狀顯影並逐漸在中心填充，第三類為整體顯影。本研究將131個肝血管瘤依直徑的大小歸類為≦10mm（n=38）、11-20mm（n=71）、21-30mm（n=22）等三組。其中直徑≦10mm之肝向管瘤主要表現第一類顯影，計有33個（86.8%）；直徑21-30mm之肝血管瘤主要表現第二類顯影，計有16個（72.8%）；直徑11-20mm之肝血管瘤則平均分佈，三類顯影各為26個（36.6%）、26個（36.6%）、19個（26.8）。大多數（123/131）肝血管瘤會在雙相掃描中都呈現比正常肝實質高密度的顯影，這可作為其診斷依據。綜合言之，熟悉肝血管瘤在雙相占旋型電腦斷層攝影中的各種特殊顯影模式，有助於免除為鑑別診斷而作的後續磁振造影、血管攝影或切片等檢查，也能對肝腫瘤作正確的術前診斷，避免濫用醫療資源，並減輕病患痛苦。

關鍵字

電腦斷層攝影；血管瘤；肝臟

並列摘要

The purpose of this study was to evaluate the prevalence of particular contrast enhancement patterns in small hemangiomas during the hepatic arterial phase (HAP) and portal venous phase (PVP) during spiral computed tomograpy. Small hemangiomas exhibit three particular enhancement patterns including low attenuation with tiny dot-like enhancement during HAP and PVP (type I), peripheral dot-like or globular enhancement during HAP and progressive central filling-in during PVP (type II). And diffusely homogenous enhancement during HAP and PVP (type III). 80 patients with 131 small hemangiomas were retrospectively reviewed in this study. Tumor diameters were ＜10mm (n=38), 11-20mm (n=71) & 21-30 mm (n=22). Findings were (1)the most common enhancement pattern among the smallest hemangiomas was type I (n=33, 86.8%), (2) the most common enhancement pattern among the largest hemangiomas was type II (n=16, 72.8%), (3) and of the medium sized hemangiomas, 26 were type I, 26 were type I and 19 were type III. Most (123/131) exhibited high attenuation relative to surrounding liver parenchyma during HAP and PVP. In summary, the various enhancement patterns characteristic of small hemangiomas faciliatate interpretation of small hepatic tumors, thereby avoiding unnecessary angiography, MRI or hepatic biopsies.

並列關鍵字

Computed tomography ； hemangioma ； liver

國際替代計量

小型肝血管瘤在雙相迴旋型電腦斷層攝影中的表現

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