| 摘要 |
FIELD: medicine. SUBSTANCE: method involves comparative evaluation of section examination of the thymus and echography findings. The longitudinal scanning (transsternal and suprasternal accesses) shows the thymus as a triangle of irregular shape, and cross scanning (access through non-ossified parts of the sternum and intercostal spaces) shows the back surface of the thymus gland as an irregular rectangle whose shape follows the contour of major blood vessels and the heart. The thymus is visualized as a homogeneous formation of average echogenic ability with clear contours and moderate quantity of high- amplitude linear echo signals. Measurements of maximum length and thickness of the thymus are taken in the course of longitudinal scanning, and its maximum width is measured in the course of cross scanning. The criterion of smaller or bigger than normal thymus is its volume calculated from the following equation: V = A x B x C x 0.504, where A is maximum length (cm), B is maximum width (cm), and C is maximum thickness (cm) of the thymus gland. Children whose age is 1-4 years have the thymus with volume ranging from 15 to 40 cu.cm (on average 24.1+/-0.65), and the ratio of the thymus volume and weight of body of the child is 0.16-0.34 (on average 0.20 +/-0.005). The thymus volume values in excess of 40.0 cu.cm and less than 15 cu.cm are indicative of pathology: too large or too small thymus respectively. EFFECT: higher method accuracy. |
