OBJECTIVE: We wanted to clarify the relationship between the visibility of air cysts on CT images, the CT slice thickness and the size of the air cysts, with contact radiographs as the gold standard, for the accurate evaluation of honeycomb cysts. MATERIALS AND METHODS: An inflated and fixed autopsied lung having idiopathic interstitial pneumonia was evaluated. The corresponding air cysts were identified on the contact radiographs of a 0.5 mm-thick-section specimen and also on the CT images of three different kinds of section thickness: 0.5, 1.0 and 2.5 mm. The maximal diameters of the air cysts were measured under a stereomicroscope. RESULTS: A total of 341 air cysts were identified on the contact radiograph, and they were then evaluated. Sixty-six percent of air cysts 1 to 2 mm in diameter were detected by 0.5 mm slice thickness CT, while only 34% and 8% were detected by 1.0 and 2.5 mm slice thickness CT, respectively. Only 28% and 22% of air cysts less than 1 mm in diameter were detected by 0.5 and 1.0 mm slice thickness CT, respectively. CT with a 2.5 mm slice thickness could not demonstrate air cysts less than 1 mm in diameter. CONCLUSION: The CT detection rate of honeycombing is significantly influenced both by the slice thickness and the size of the air cysts.
Aged ; Aged, 80 and over ; Cadaver ; Cysts/*radiography ; Female ; Humans ; Lung Diseases/pathology/*radiography ; Tissue Fixation/methods ; *Tomography, X-Ray Computed

During the past five years, 141 cases of liver cirrohosis were hospitalized intoour clinic. The mean age of these patients was 57.8 years old, and the ratio of male to female was 2.8 to 1. HBs antigen was positive in 16 cases, and among the patients without HBs antigen 49 cases of heavy alcoholic drinker were found. Seventy patients with liver cirrhosis were dividedinto a compensatory group and a decompensatory group according to three clinical findings, ascites, hepatic encephalopathy and bleeding from gastrointestinal tract. It was suggested that five items of biochemical data for liver function were very important on discriminating these two groups. The five items were cholinesterase, indocyanine green test, albumin, prothrombin time and erythrocyte count.
Next, we studied clinical findings of eight patients with minute hepatocellular carcinoma hospitalized into our clinic during the past five years. About a definition of minute hepatocellular carcinoma, we have defined that the tumor size should be less than 3 cm in diameter. Six of these patients were male, and average age was 56.7 years old. Of these patients, five were complicated by liver cirrhosis, and only one revealed positive HBs antigen in serum. The serum alpha-fetoprotein level showed more than 400 ng/ml in three patients. And we have thought that ultrasonographic examination is most effective to diagnose minute hepatocellular carcinoma in various diagnostic imaging methods. Most of patients exhibited a decreased functional reserve in the liver, but six patients underwent hepatic resection. After operation, one patient died of acutehepatic insufficiency on the 8th day, and one died of the recurrence of tumor on the 11th month. Otherfour patients have been alive now.

OBJECTIVE: To investigate the basic characteristics of degradable gelatin microspheres (GMSs), including their embolic behavior and degradation periods when they are used as embolic materials in the renal arteries of rabbit models. MATERIALS AND METHODS: Based on the GMS particle size, 24 kidneys were divided into 3 groups of eight kidneys, and each group was embolized with a different GMS particle size (group 1: 35-100 micrometer, group 2: 100-200 micrometer, and group 3: 200-300 micrometer). From each group, two rabbits were sacrificed immediately after embolization (day 0), and a pair of rabbits from each group underwent an angiogram and were sacrificed on days 3, 7, and 14, respectively, after embolization. The level of arterial occlusion, the pathological changes in the renal parenchyma, and the degradation of the GMSs were evaluated angiographically and histologically. RESULTS: A follow-up angiogram on days 0, 3, 7, and 14 revealed the presence of wedge-shaped poorly-enhanced areas in the parenchymal phase as seen in all groups. The size of these areas tended to increase with the particle diameter, and persisted up to day 14. On days 3, 7, and 14, parenchymal infarctions were observed histologically in all cases, and this observation corresponded with the parenchyma being supplied by the embolized arteries. GMSs of group 1 mainly reached the interlobular arteries, while those of group 3 mainly reached the interlobar arteries. In all but two cases, the GMSs were identified histologically even on day 14, and sequential degradation was histologically identified in all GMS groups. CONCLUSION: GMSs can be used as degradable embolic materials which can control the level of embolization.
Animals ; Biocompatible Materials ; Disease Models, Animal ; Embolization, Therapeutic/*methods ; Female ; Follow-Up Studies ; *Gelatin ; Kidney/blood supply ; *Microspheres ; Particle Size ; Rabbits ; Renal Artery/drug effects/pathology/radiography ; Renal Artery Obstruction/*chemically induced ; Severity of Illness Index ; Time Factors