Normal anatomy of the cerebellum (left). Chiari I malformation (right). With the size of the posterior fossa too small, the cerebellar tonsils may herniate through the skull into the spinal canal. The tonsils block the flow of CSF (blue) and may cause fluid buildup inside the spinal cord, called a syrinx.Syringomyelia, hydrocephalus, and other complications.verview. Chiari I malformation is a condition in which the bony space enclosing the lower part of the brain is smaller than normal. Crowding causes the cerebellar tonsils to push through the skull and down into the spinal canal.
Silverton, Oregon. Silverton is a city in Marion County, Oregon, United States. The city is situated along the 45th parallel about 12 miles (19 km) northeast of Salem, in the eastern margins of the broad alluvial plain of the Willamette Valley.
In 1928 the town became the northern terminus of the Fort Worth and Denver South Plains Railway from Lubbock. Silverton was subsequently incorporated, and it grew. Natural gas was introduced in 1929 by the West Texas Gas Company. By 1940 Silverton had thirty-five businesses and a population of 684. Throughout its history Silverton has suffered from prairie fires, grasshoppers, dust storms, and cyclones. Its worst disaster occurred on the night of May 15, 1957, when a tornado killed twenty-one people and did over $1 million worth of damage.