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肝臟動(dòng)脈期一過(guò)性強(qiáng)化灶-預(yù)覽頁(yè)

 

【正文】 異常靜脈引流;(異常動(dòng)脈供血?) 肝臟異常灌注的病因 ? 創(chuàng)傷及各種經(jīng)過(guò)肝實(shí)質(zhì)的介入性操作 ; ? 腫瘤: 良性腫瘤: 血管瘤,炎性假瘤, FNH,嗜酸性肉芽腫; ? 惡性腫瘤: 肝癌、膽管細(xì)胞癌、轉(zhuǎn)移癌(富血供?) ? 炎癥: 膽管炎,肝膿腫 , ? 門靜脈、肝靜脈梗阻 (癌栓、布 加), 主要膽道梗阻; ? 先天性的: 動(dòng)靜(門)脈畸形,異常靜脈引流 ? 肝臟內(nèi)血管受擠壓或阻塞 : 肝周腫瘤、包膜下積液、巨脾、大量胸腔積液及外傷致肋骨壓迫等 ? ① 創(chuàng)傷及各種介入性操作: ? 肝實(shí)質(zhì)的挫裂及肝內(nèi)血管的斷裂; ? 各種介入性操作:包括經(jīng)皮肝穿刺活檢術(shù)、取石術(shù)、膽道引流術(shù)、腫瘤的物理消融術(shù)等; ? 各種損傷的共同機(jī)制是 導(dǎo)致肝動(dòng)脈與門靜脈之間的直接交通,引起動(dòng)脈 門靜脈分流,導(dǎo)致肝動(dòng)脈血流進(jìn)入門靜脈系統(tǒng),而出現(xiàn)肝動(dòng)脈血流的重新分配,它是產(chǎn)生肝臟異常高灌注的主要原因。 ? 肝臟富血供腫瘤的“盜血”作用 ,也是產(chǎn)生肝臟病理性灌注異常常見(jiàn)原因。 ? 65歲男性患者,肝細(xì)胞肝癌; ? 肝硬化。 ? 腫瘤外側(cè)的楔形動(dòng)脈期一過(guò)性強(qiáng)化灶; ? Fig. 10C — 59yearold man with large hepatic intraparenchymal metastasis from colon carcinoma and correlated sectorial fanshaped transient hepatic intensity difference. Axial gradientecho fatsuppressed T1weighted unenhanced (146/2) (B) and axial gradientecho fatsuppressed T1weighted gadoliniumenhanced arterial phase (146/2) (C) MR images show wide fanshaped arterial phenomenon with straight border (arrowhead, C) due to hypointense neoplastic lesion at its apex (arrow), causing portal pression. Note how segment III is also slightly enhanced. Although this transient hepatic intensity difference could look like lobar type because of distribution, this arterial phenomenon is undoubtedly sectorial because lesion, being hypodense and hypoenhancing, causes portal pression and not a primary increase in arterial flow. ? 50歲男性患者 ? 肝包膜下血管瘤 ? 楔形動(dòng)脈期一過(guò)性強(qiáng)化灶 ? B超見(jiàn)楔形區(qū)域 — 低回聲, ? 彩色多普勒可見(jiàn)肝動(dòng)脈 門靜脈分流 ? 6B — 50yearold man with small round hemangioma beneath Glisson3
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