Unroofed coronary sinus is a rare cardiac anomaly in which communication occurs between the coronary sinus and the left atrium due to the partial or complete absence of the roof of the coronary sinus. It is usually associated with other cardiovascular anomalies, especially persistent left superior vena cava. It is often not discovered during cardiac catheterization without clinical suspicion. We report three cases of unroofed coronary sinus which were incidentally detected by magnetic resonance imaging.

Contrast enhancement during the dynamic MR imaging is important for the detection and characterization of focal liver lesions. The purpose of this study was to determine whether or not a timing examination with a injection of a 1.0-mL bolus of gadopentetate dimeglumine into the antecubital vein followed by rapid dynamic scanning and measurement of signal intensity of the aorta could help to obtain proper arterial-dominant phase images for the characterization of focal hepatic lesions during subsequent multiphase dynamic MR imaging. The imaging delay to acquisition of the first gadolinium-enhanced image for multiphase dynamic MR imaging was set to equal the time to peak aortic enhancement during the test examination. The first contrast-enhanced images of 80 patients with 160 focal liver lesions (hepatocellular carcinoma, n = 79; cavernous hemangioma, n = 51; metastatic tumor, n = 30) were then retrospectively reviewed. Peak aortic enhancement occurred between 10 and 28 seconds (mean, 16.5 seconds +/- 3.1) after starting the infusion of contrast material in 80 patients during the test-examination. Depending on the findings of intrahepatic vascular enhancement on the full-scale dynamic images, hepatic arterial phase (n = 11, 14%) or sinusoid phase (n = 65, 81%) imaging was obtained during the first gadolinium-enhanced acquisition in 76 (95%) of 80 patients. Three different lesions were well characterized and easily distinguished from each other (p < .0001) on the first-phase images depending on their enhancement pattern. In the majority of patients, timing examination with test-bolus injection was helpful in obtaining qualified images for the characterization of various focal lesions.

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Pulmonary aspergilloma may usually d emonstrate the classic " air-crescent sign" in the convemional radiograph However' this lesion is often seen as a pulmonary nodule or is obscured by the surrounding scarred and fibroti c lung tissue. which may limit the value of the conventional techniques and hinder the diagnosis.We re trospective ly analysed the pla in film findings of 44 lesions of 40 patie nts and CT findings of 29 lesions of 26 patients with pulmonary aspergilloma with special emphasis upon the atypical manifestation. The cases with classic " a ir-meniscus sign" in conventional radiograph accounted for 50%. while 30% presented with a pulmonary nodule a nd 20% were unrecognized forms due to surroundinjg parenchymallesion. CT findings of28 aspergi\lomas wer e analyzed a ccording to the shape of the intracavitary space(space between the cavity wa ll and the fungal ball) and the fungal ball itself. The intracavity space showed " aír-m e níscus sígn ' ' (62%) . filling cavity(28% J. peripheral air bubble(3 %) and high d ensity due to h emorrhage(3% J. in descending order of frequency. The s hape of the fungal ball itself showed homogeneous low density mass(62 %) and spongeform or irregular air bubble contained mass(34 %).CT was more accurate than conventional radiograph in the diagnosis and evaluation of number and location of atspergilloma. particularly in the case of atypical presentaion and was useful to assess the associate disease and to pre di ct postoperative outcome.