No abstract available.
Hemangioma/*blood supply ; Hepatic Artery/radiography ; Humans ; *Liver Circulation ; Liver Neoplasms/*blood supply ; Male ; Middle Aged ; Portal Vein/radiography

Alveolar soft-part sarcoma is a rare soft tissue sarcoma of young adults with unknown histogenesis, and the organ most frequently involved in metastasis is the lung. We report the CT findings of three patients of pulmonary metastases of alveolar soft-part sarcoma, which manifested as clearly enhanced pulmonary nodules or masses. On enhanced scans, some of the masses were seen to contain dilated and tortuous intratumoral vessels.
Adult ; Case Report ; Female ; Human ; Lung Neoplasms/blood supply/*radiography/*secondary ; Male ; Sarcoma, Alveolar Soft Part/blood supply/*radiography/*secondary ; *Tomography, X-Ray Computed

OBJECTIVE: To predict which intercostal artery supplies a tumor by examining the spatial relationship between hepatocellular carcinoma (HCC) and the intercostal artery feeding the tumor on transverse computed tomography (CT) images. MATERIALS AND METHODS: Between January 2000 and September 2009, 46 intercostal arteries supplying HCCs smaller than 4 cm were noted in 44 patients, and CT scans and angiograms of these patients were retrospectively reviewed. The intercostal artery feeding the tumor was marked on the CT scan showing the center of the tumor. In addition, its spatial relationship with the tumor center was examined. The angle of the tumor location was measured on the transverse CT scan in the clockwise direction from the sagittal line on the virtual circle centered in the right hemithorax. Correlations between the angle of the tumor location and the level of the tumor-feeding intercostal artery were assessed with the Spearman rank coefficient. RESULTS: Of 46 intercostal arteries feeding HCC, 39 (85%) were the first ones observed from the tumor center in a counterclockwise direction on the transverse CT image containing the tumor center. The level of the tumor-feeding intercostal artery was significantly correlated with the angle of the tumor, as the posteriorly located tumor tends to be supplied by lower intercostal arteries, while the laterally located tumor by upper intercostal arteries (Spearman coefficient = -0.537; p < 0.001). CONCLUSION: We can predict the tumor feeder with an accuracy of 85% as the first intercostal artery encountered from the tumor center in a counterclockwise direction on a transverse CT image.
Adult ; Aged ; Aged, 80 and over ; Carcinoma, Hepatocellular/*blood supply/radiography/therapy ; Chemoembolization, Therapeutic ; Female ; Humans ; Liver Neoplasms/*blood supply/radiography/therapy ; Male ; Middle Aged ; *Multidetector Computed Tomography

OBJECTIVE: We aimed to estimate the effective dose of 4D-Perfusion-CT protocols of the lung, liver, and pelvis for the assessment of tumor vascularity. MATERIALS AND METHODS: An Alderson-Rando phantom equipped with thermoluminescent dosimeters was used to determine the effective dose values of 4D-Perfusion-CT. Phantom measurements were performed on a 128-slice single-source scanner in adaptive 4D-spiral-mode with bidirectional table movement and a total scan range of 69 mm over a time period of nearly 120 seconds (26 scans). Perfusion measurements were simulated for the lung, liver, and pelvis under the following conditions: lung (80 kV, 60 mAs), liver (80 kV/80 mAs and 80 kV/120 mAs), pelvis (100 kV/80 mAs and 100 kV/120 mAs). RESULTS: Depending on gender, the evaluated body region and scan protocol, an effective whole-body dose between 2.9-12.2 mSv, was determined. The radiation exposure administered to gender-specific organs like the female breast tissue (lung perfusion) or to the ovaries (pelvic perfusion) led to an increase in the female specific dose by 86% and 100% in perfusion scans of the lung and the pelvis, respectively. CONCLUSION: Due to a significant radiation dose of 4D-perfusion-CT protocols, the responsible use of this new promising technique is mandatory. Gender- and organ-specific differences should be considered for indication and planning of tumor perfusion scans.
Female ; *Four-Dimensional Computed Tomography ; Humans ; Male ; Neoplasms/*blood supply/*radiography ; Phantoms, Imaging ; *Radiation Dosage

Leiomyosarcomas of the ovarian vein are very rare. Four cases have been reported in the English language clinical literature. We present a case of leiomyosarcomas where the use of multi-detector CT had a substantial role in the establishment of the preoperative diagnosis. The radiological images as well as intraoperative features are illustrated. We also discuss the radiological findings of the ovarian vein leiomyosarcoma in comparison with those of other venous or retroperitoneal leiomyosarcomas. We expect that the use of multi-detector CT will be the choice for the diagnostic work-up of vascular leiomyosarcomas.
Adult ; Female ; Humans ; Leiomyosarcoma/*radiography/surgery ; Ovary/*blood supply ; Tomography, X-Ray Computed ; Vascular Neoplasms/*radiography/surgery ; Veins

BACKGROUND/AIMS: Hepatocellular carcinoma (HCC) is becoming one of the common malignant tumors worldwide, and it is characterized by its high vascularity. Caveolin is the major structural protein in caveolae, which are small omega-shaped invaginations within the plasma membrane. Caveolin has been implicated in mitogenic signaling, oncogenesis and angiogenesis. The expression of caveolin-1 and -2 in HCC and its potential relationship with angiogenesis has not been examined. METHODS: Paraffin sections of 35 HCC specimens were immunostained with caveolin-1, caveolin-2, alpha-smooth muscle actin, and CD34 antibodies. In addition, the expression of caveolin-1 and -2 mRNA in HCC was examined. The relationship between the radiological findings and the number of unpaired arteries and microvessel density (MVD) was also investigated. RESULTS: Caveolin-1 and -2 were expressed in the sinusoidal endothelial cells in 20 out of 35, and 18 out of 35 HCC specimens, respectively. Caveolin-1 and -2 were also expressed in the smooth muscle cells of the unpaired arteries in 26 out of 35, and 18 out of 35 HCC specimens, respectively. Increased expression of caveolin-1 and -2 mRNA was detected in 26.7% and 33.3% of the tumor specimens, respectively, compared with the corresponding non-tumorous adjacent liver tissues. There was a significant correlation between expression of caveolin-1, -2 in the smooth muscle cells of unpaired arteries and the number of unpaired arteries. The number of unpaired arteries in HCCs was found to be associated with the degree of contrast enhancement in the arterial phase imaging. However, it did not correlate with the degree of MVD. CONCLUSIONS: These findings suggest that the expression of caveolin-1, -2 is associated with the formation of unpaired arteries in HCC. In addition, there is a correlation between the degree of contrast enhancement of the HCC in the arterial phase image and the number of unpaired arteries.
Adult ; Aged ; Carcinoma, Hepatocellular/*blood supply/metabolism/radiography ; Caveolin 1/genetics/*metabolism ; Caveolin 2/genetics/*metabolism ; Female ; Hepatic Artery/pathology/radiography ; Humans ; Liver Neoplasms/*blood supply/metabolism/radiography ; Male ; Middle Aged ; Neoplasm Staging ; Neovascularization, Pathologic/etiology/*metabolism/radiography ; Retrospective Studies

Omental infarction occurring after open and laparoscopic-assisted distal gastrectomy with partial omentectomy for gastric cancer was a very rare disease in the past, but its incidence has increased as more partial omentectomies are now being performed. But there are few case reports or radiologic studies on its increasing incidence. It is necessary to differentiate omental infarction from carcinomatosis peritonei, since both have similar imaging findings. In this report, we describe two cases of omental infarction; each occurred after open and laparoscopic-assisted distal gastrectomy in early gastric cancer patients. Partial omentectomy was performed in both cases. Omental infarction following distal gastrectomy with partial omentectomy can be discriminated from carcinomatosis peritonei by comparing with different initial and follow up CT findings.
Aged ; Female ; Gastrectomy/*adverse effects ; Humans ; Infarction/*etiology/radiography ; Laparoscopy/*adverse effects ; Middle Aged ; Omentum/*blood supply/radiography/surgery ; Stomach Neoplasms/surgery ; Tomography, X-Ray Computed

OBJECTIVE: The conventional method of dividing hepatic segment 2 (S2) and 3 (S3) is subjective and CT interpretation is unclear. The purpose of our study was to test the validity of our hypothesis that the actual plane dividing S2 and S3 is a vertical plane of equal distance from the S2 and S3 portal veins in clinical situations. MATERIALS AND METHODS: We prospectively performed thin-section iodized-oil CT immediately after segmental chemoembolization of S2 or S3 in 27 consecutive patients and measured the angle of intersegmental plane on sagittal multiplanar reformation (MPR) images to verify its vertical nature. Our hypothetical plane dividing S2 and S3 is vertical and equidistant from the S2 and S3 portal veins (vertical method). To clinically validate this, we retrospectively collected 102 patients with small solitary hepatocellular carcinomas (HCC) on S2 or S3 the segmental location of which was confirmed angiographically. Two reviewers predicted the segmental location of each tumor at CT using the vertical method independently in blind trials. The agreement between CT interpretation and angiographic results was analyzed with Kappa values. We also compared the vertical method with the horizontal one. RESULTS: In MPR images, the average angle of the intersegmental plane was slanted 15 degrees anteriorly from the vertical plane. In predicting the segmental location of small HCC with the vertical method, the Kappa value between CT interpretation and angiographic result was 0.838 for reviewer 1 and 0.756 for reviewer 2. Inter-observer agreement was 0.918. The vertical method was superior to the horizontal method for localization of HCC in the left lobe (p < 0.0001 for reviewers 1 and 2). CONCLUSION: The proposed vertical plane equidistant from S2 and S3 portal vein is simple to use and useful for dividing S2 and S3 of the liver.
Adult ; Aged ; Aged, 80 and over ; Angiography, Digital Subtraction ; Antibiotics, Antineoplastic/administration & dosage ; Carcinoma, Hepatocellular/blood supply/radiography/therapy ; Chemoembolization, Therapeutic ; Contrast Media ; Doxorubicin/administration & dosage ; Female ; Humans ; Iodized Oil/diagnostic use ; Liver/*blood supply/*radiography ; Liver Neoplasms/blood supply/radiography/therapy ; Male ; Middle Aged ; Prospective Studies ; Registries ; Retrospective Studies ; *Tomography, Spiral Computed

OBJECTIVE: To investigate the relationship between the perfusion CT features and the clinicopathologically determined prognostic factors in advanced gastric cancer cases. MATERIALS AND METHODS: A perfusion CT was performed on 31 patients with gastric cancer one week before surgery using a 16-channel multi-detector CT (MDCT) instrument. The data were analyzed with commercially available software to calculate tumor blood flow (BF), blood volume (BV), mean transit time (MTT), and permeability surface (PS). The microvessel density (MVD), was evaluated by immunohistochemical staining of the surgical specimens with anti-CD34. All of the findings were analyzed prospectively and correlated with the clinicopathological findings, which included histological grading, presence of lymph node metastasis, serosal involvement, distant metastasis, tumor, node, metastasis (TNM) staging, and MVD. The statistical analyses used included the Student's t-test and the Spearman rank correlation were performed in SPSS 11.5. RESULTS: The mean perfusion values and MVD for tumors were as follows: BF (48.14+/-16.46 ml/100 g/min), BV (6.70+/-2.95 ml/100 g), MTT (11.75+/-4.02 s), PS (14.17+/-5.23 ml/100 g/min) and MVD (41.7+/-11.53). Moreover, a significant difference in the PS values was found between patients with or without lymphatic involvement (p = 0.038), as well as with different histological grades (p = 0.04) and TNM stagings (p = 0.026). However, BF, BV, MTT, and MVD of gastric cancer revealed no significant relationship with the clinicopathological findings described above (p > 0.05). CONCLUSION: The perfusion CT values of the permeable surface could serve as a useful prognostic indicator in patients with advanced gastric cancer.
Adult ; Aged ; Female ; Humans ; Lymphatic Metastasis ; Male ; Microcirculation ; Middle Aged ; Prognosis ; Prospective Studies ; Regional Blood Flow ; Stomach Neoplasms/*blood supply/pathology/*radiography ; *Tomography, X-Ray Computed

OBJECTIVETo explore the differences between the angioarchitecture, hemodynamics, ultrastructure of neovasculr endothelial cells, and vascular distribution in different perfusion regions in benign and malignant breast tumors.

METHODS30 cases of breast carcinoma (33 lesions) and 30 cases of breast fibroadenoma (34 lesions) were examined by contrast enhanced microvascular imaging (MVI), and perfusion indexes were collected both inside and at the margin of each focus according to time-intensity quantitative analysis, including peak intensity (PI), area under the curve (AUC), time to peak (TTP) and wash-out time (WOT). The ultrastructure of neovascular endothelial cells was examined by transmission electron microscopy. The expression of CD34, VEGF, Flk-1/KDR in both two groups were detected by immuhistochemistry.

RESULTSSignificant differences were found between the two groups characterized with filling defect, vascular distortion, dilatation and uneven enhancement. Most of the curves of malignant group (87.9%, 29/33) ascended rapidly and dropped slowly while those of the benign group (79.4%, 27/34) ascended slowly and dropped rapidly. The AUC and WOT of malignant tumor group were significantly higher than those of benign group, while the PI and TTP had statistically no significant difference. In the malignant tumor group, PI, AUC and WOT collected from the margin of foci were significantly different from those collected inside the foci, however, there was no significant difference in the benign group. The margin of foci was characterized with dilated and distorted vessels, and the center of the foci was occupied by narrow or occluded blood vessels, sometimes with contracted endothelial cells and pericytes. Abundant microvascular areas located at the margin of foci. The ultrastructure of endothelial cells in the newly formed blood vessels of malignant group showed strong ability to divide, which was different from normal endothelium cells.

CONCLUSIONThe perfusion pattern, mode of time-intensity curve, mean perfusion parameter and variation of regional perfusion parameters provide a valuable diagnostic basis in distinguishing benign and malignant breast tumors. The density, morphology, distribution, structure and function of newly formed microvessels in tumor foci are also crucial factors when tumors are assessed by imaging examination.

Antigens, CD34 ; metabolism ; Area Under Curve ; Breast Neoplasms ; blood supply ; diagnostic imaging ; pathology ; ultrastructure ; Carcinoma in Situ ; blood supply ; diagnostic imaging ; pathology ; ultrastructure ; Carcinoma, Ductal, Breast ; blood supply ; diagnostic imaging ; pathology ; ultrastructure ; Contrast Media ; Female ; Fibroadenoma ; blood supply ; diagnostic imaging ; pathology ; ultrastructure ; Hemodynamics ; Humans ; Microscopy, Electron, Transmission ; Microvessels ; diagnostic imaging ; pathology ; ultrastructure ; Neovascularization, Pathologic ; diagnostic imaging ; pathology ; Radiography