The transverse cerebellar diameter increases gradually with development. A transverse cerebellar diameter of 19 mm is normal if measured in a fetus at about 19 weeks, and is not normal in patients presenting at other gestational ages and ages.
Measurement of the transverse cerebellar diameter is one of the ways to detect the level of neurological development of the fetus. When the fetus develops to about 18-20 weeks, the transverse cerebellar diameter of the fetus will gradually increase to about 19mm, therefore, for a fetus at about 19 weeks, the transverse cerebellar diameter of 19mm is normal.
However, it should be noted that for fetuses older than 20 weeks, a cerebellar diameter of 19 mm is slightly smaller than normal.
The cerebellum originates after 6 weeks of gestation and develops earlier than most of the brain structures in the cranium, and its growth and development are more stable. The growth and development of the cerebellum accelerates after the middle of gestation and is basically completed by 18 months after birth. During this period of growth and development, the cerebellum is one of the fastest-growing brain structures in the cranium.
The cerebellum is one of the fastest growing brain structures in the skull during this period of growth and development. If the cerebellar transverse diameter is significantly smaller than the average for the same age group, it is necessary to be alert to the presence of infections, nutritional deficiencies, and other problems affecting cerebellar development.
If the cerebellar transverse diameter is abnormal, it is recommended to go to the hospital promptly.