MR Findings of Chondroblastoma with Emphasis on Enhancement Pattern

PURPOSE: To analyze the MR findings of chondroblastoma and peritumoral bone marrow, focussing on the enhancement pattern. MATERIALS AND METHODS: Enhanced MR images obtained from 23 patients with pathologically proven chondroblastoma were retrospectively reviewed by three radiologists. The enhancement pattern was classified as one of three types: homogeneous, heterogeneous, or peripheral rim, while peritumoral bone marrow enhancement was assigned one of four grades. Correlation between the enhancement pattern and T2 signal intensity of a tumor was analyzed by Fisher's exact test. RESULTS: The enhancement pattern was homogeneous in ten cases, heterogeneous in six, and involved the peripheral rim in seven. In 11 cases, peritumoral bone marrow enhancement was observed. Among the ten instances of homogeneous enhancement the signal intensity seen at T2WI was homogeneously iso or low in six cases, homogeneously high in two, and heterogeneous in two. Among the seven cases in which there was peripheral rim enhancement, the signal intensity observed at T2WI was homogeneously high in three, fluid-fluid level in three, and homogeneously iso or low in one. CONCLUSION: At MR imaging, chondroblastoma shows variable signal intensities and enhancement patterns. The peripheral rim enhancement observed at T2WI correlated with homogeneously high signal intensity or fluid-fluid levels.

Blood Lead, Manganese, Aluminium and Silicon Concentrations in Korean Adults / 예방의학회지

OBJECTIVES: This study was performed to determine the reference values of blood lead, manganese, aluminium, and silicon in healthy adults. METHODS: The subjects were 132 (67 male and 65 female), and classified to three age groups (< or =39, 40~49, and 50< or =). Blood lead, manganese and aluminium were analyzed by atomic absorption spectrophotometer, and blood silicon was analyzed by direct current plasma optical emission spectrometer. RESULTS: Blood lead levels(geometric mean, S.D) were (3.49, 1.70) microgram/dL in male and (3.04, 1.65) microgram/dL in female, but the difference is not significant, and there was no significant difference between age groups. Mean blood manganese level was 0.99+/-0.41 microgram/dL, and there was no significant difference between sex or age groups. Mean blood aluminium level was 0.59+/-0.35 microgram/dL, and there was no significant difference between sex or age groups. Mean blood silicon level was 54.41+/-27.64 microgram/dL in male and 43.34+/- 23.51 microgram/dL in female, and the level in male was significantly higher than that in female (p<0.05). There was significant difference between age groups, and the oldest showed the highest level in male (p<0.05), but no significant difference between age groups in female. CONCLUSIONS: Authors hope that this study would provide basic data for determining reference values and evaluating health effects.