低密度灶

CT扫描仅2例（5.6%）显示出低密度灶。

2 ( 5.6 % ) cases showed low density on CT images .

结果皮质下动脉硬化性脑病的主要CT表现为：①脑深部对称性的低密度灶；

Results Main CT findings included : ① Symmetrical lower density in deep whitematter ;

CT以双侧丘脑成蝶形对称性低密度灶为特征。

The main character of brain CT is symmetric butterfly shape hypodense lesions in both thalami .

CT平扫表现为多发斑片状、片状低密度灶，部分夹有混杂密度影；

Plain CT scan displayed lamellar low density umbra , part of them were mixed density .

CT扫描显示在一侧或双侧基底节区点或片状钙化，其附近存在类圆形点或片状低密度灶。

CT scan showed punctuate calcified foci with circular infarcts of low density beside them in single or bilateral basal ganglia .

恶性淋巴瘤CT表现为脾肿大，脾内多发或单发低密度灶，边缘不规整。

On CT , malignant lymphoma of spleen shows splenomegaly and single or multiple lesions with low density and irregular borders .

CT改变为脑变性及继发性脑萎缩，表现为形状及大小不一的低密度灶。

The CT changes are cerebral degeneration and secondary cerebral atrophy , manifested as low density focus different in both shape and size .

结果21例脑脓肿中，单发17例，多发4例。CT平扫表现为单个或多个低密度灶或囊状病灶。

Results There were 17 cases that had single lesions and 4 had multiple lesions displaying single or multiple low density focus or cyst-like lesions .

颅脑CT复查低密度灶平均体积显著小于对照组（P＜0.01）。

The average area of low density focus from brain CT Scan in therapy group was remarkably less than that in control group ( P 0.01 ) .

多发低密度灶6例。13例均同时存在多脏器转移。结论：脾转移瘤CT表现多样化，脾脏转移出现的意义在于证明广泛转移的存在。

On CT study , 6 cases demonstrated cystic-solid feature , 1 case multiple cyst , 6 cases multiple low density.13 cases had multiple organic metastasis .

CT表现实质脏器内限局性低密度灶，单发或多发，轻度强化，病灶显示更清楚。

The CT imaging in solid viscera revealed focal low density areas , mild enhancement after intravenous contrast media , and the lesions were more apparent in CT imaging .

方法：以头颅CT扫描观察脑室周围低密度灶并按GOTO方法分型。

METHODS : Low - density focus around ventricle were observed with skull CT scanning and classified according to GOTO classification .

60例病人中轻度痴呆21例（35%），中度痴呆24例（40%），重度痴呆15例（25%），且全部病人具有局灶性神经系统症状和体征，颅脑CT可见脑室周围低密度灶；

Serious , 15 patients ( 25 % ) . Focal nervous system symptoms and signs were presented in all patients . The brain CT scans was observed with peripheral ventricular low density .

结论肝豆状核变性颅脑CT最多见征象是脑萎缩与基底节低密度灶，特别是双侧豆状核区对称性低密度灶最具有特征性。

Conclusion The most common CT findings in hepatolenticular degeneration patients are mainly brain atrophy and low density of the basal ganglia , especially the symmetrical low density of the lentiform nuclei is characteristic of Wilson disease on CT .

结果：治疗组在改善临床症状、促使脑脊液蛋白恢复正常和缩小颅内低密度灶等方面皆优于对照组（P0.05）。

Results : The improvement of symptoms , recovery of cerebrospinal protein and reducing encephalic low density focus in the treatment group were significantly superior to that in the control group ( P0.05 ) .

脑CT发现双侧豆状核区低密度灶9/17例（53%），其中3例同时累及丘脑。弥漫性脑萎缩14/17例（82.4%）。

The brain CT findings were low density plaques in the lenticular nuclei on both sides in 9 / 17 cases ( 53 % ) , 3 cases with additional involvement of thalamus , and diffuse brain atrophy in 14 / 17 cases ( 82.4 % ) .

目的观察病毒性脑炎急性和恢复期患者血液和脑脊液的S100b蛋白浓度变化，探讨其与异常脑电图和影像学低密度灶体积等方面的相关性。

Objective To investigate the changes of S-100b protein concentration in serum and cerebrospinal fluid from patients with viral encephalitis and to find out the correlation with anomaly electroencephalogram and low density focus volume of imageology .

肝内结节、斑片低密度灶可能与炎性肉芽肿及胆管周围炎有关。

The nodular lesion and the small area of low density in liver parenchyma may relate to the inflammatory granuloma and periangiocholitis .

早产窒息儿颅内病变重，如脑实质弥漫性低密度灶伴有出血或脑室内出血者预后差。

Intractanial lesions were more serious in asphyxial premature ones . If there were cerebral diffuse lesions with bleeding or bleeding in ventricles , the prognosis would be poor .

弥漫性低密度灶累及大脑各叶15例。其中4例合并蛛网膜下腔出血，2例合并脑室出血。

Diffuse low density region in all cerebral lobe were found in 15 cases , in which subarachnoid hemorrhage was complicated in 4 cases , and ventricular hemorrhage was found in 2 case .

统计皮层下动脉硬化性脑病81例，结果：全部病例于侧脑室周围以及半卵圆中心白质出现斑片状低密度灶，绝大多数是对称性；

81 cases of SAE , the results ( 1 ) all the cases with macular low-density focals around lateral ventricle and central white matter in half-oval , most of them were in symmetry .

结果：病变多为大脑皮质、丘脑、基底节区低密度灶，1例位于脑干，1例伴病灶内出血。

Results : Abnormalities located mainly in cerebral cortices , nuclei basales and thalamus , the lesions presented as low density on CT scan , 1 case was finding in truncus encephalicus and hemorrhage in 1 case .

结果：12例表现为弥漫性的低密度灶，脑萎缩6例，双侧尾状核钙化4例。

Results : Positive CT findings were seen in all the 12 cases and the signs presented as diffused hypodense cerebral parenchyma in 12 cases , cerebral atrophy in 6 cases and calcification in bilateral caudate nuclei in 4 cases .

方法：儿童6例，成人6例，均有外伤史，都作头颅CT平扫。结果：12例头颅CT平扫先后都示低密度梗塞灶；

Methods : 12 patients with traumatic history were imaged by plain CT scan , of them 6 were children .

结论肝脾外伤性破裂有诊断价值的CT征象主要有：①肝脾脏内不规则形高、低密度出血灶；

Conclusion For diagnosing the liver and spleen traumatic rupture , following CT findings are valuable : ① Irregular high and low density bleeding focuses in liver and spleen ;

结果：62个肝脓肿中，典型肝脓肿23个，不典型肝脓肿39个，CT平扫均表现为较正常肝组织为低的低密度灶，部分病灶可见脓腔内气体。

Results : Of the 62 lesions , 23 lesions were typical and 39 lesions were atypical . In plain CT scan , the abscesses usually exhibited as hypodense mass and air can be seen in the cavity .

肝脾包膜下血肿表现为肝脾缘等或低密度新月形灶15例，部分新鲜血肿可为高密度灶。

11 cases represented multi spots of high density in above mentioned focuses . Hematoma under envelop of liver and spleen : 15 cases represented same or low density lunular focuses lying the edge of liver and spleen , some fresh hematoma represented high density .

1d后病灶呈类圆形、纺锤状或椭圆形低密度改变，直径达1.0～2.0cm；3d后为直径不到1.0cm小结节状低密度灶；

The low-density lesions remained irregular shape or became fusiform , ellipse or round with 1.0 ~ 2.0 cm ~ 2 in size one day later , and less than 1.0 cm ~ 2 in size three days later .