An ultrasonographic study of experimental hematoma in rabbit

Sequenctial ultrasonography was performed after induction of vitreous hematoma in 24 rabbits eyeball to analyze the characteristic sonographic findings of resorbing hematoma. Ultrasonography was done at immediate after inducing hematoma and were followed up at 2nd day, 1st week, 2nd week and 4th week. The result were as follows; 1. In immediate scan after inducing hematoma, multiple sheet-like or linear shaped hematoma was more common than round or diffuse shaped. 2. Size of hematoma was decreased from 2nd day, much more at l1st week, and nearly or completely absorbed at 4th week. 3. Margin of hematoma was blurred from 2nd day and rapidly changed afterward. 4. Even though echogenecity of hematoma in immediate B-mode scan after inducing hematoma showed largely less echogenic than that of retro-orbital fat, hyperechoic and isoechoic cases were also seen. 5. Reflectivity of hematoma, till 2nd day, showed largely over 50% of that of retro-orbital fat, but decreased to the level of below 50%at 1st week, and nearly or completely absorbed at 4th week