Type I is the only type of Chiari malformation that can be acquired. Type II. This is usually only seen in children born with spina bifida. Spina bifida is the incomplete development of the spinal cord and/or its protective covering.Type II is also known as classic Chiari malformation or Arnold-Chiari malformation.In type II Chiari malformation, both the cerebellum and the brain stem extend into the foramen magnum. 1 | 2 | 3. Continue reading below...ypes of Chiari Malformations. There are four types of Chiari malformations: Type I. This is by far the most commonly observed type in children. In this type, the lower part of the cerebellum -- but not the brain stem -- extends into an opening at the base of the skull. The opening is called the foramen magnum.
Many heart murmurs are harmless. These types of murmurs are called innocent murmurs. They will not cause any symptoms or problems. Innocent murmurs do not need treatment. Other heart murmurs may indicate an abnormality in the heart. These abnormal murmurs can be caused by: 1  Problems of the aortic valve (aortic regurgitation, aortic stenosis)  Problems of the mitral valve (chronic or acute mitral regurgitation, mitral stenosis)
A heart murmur is an abnormal heart sound caused by turbulent blood flow into, through or out of one or more heart chambers. A murmur itself is not a disease; it is just a sound that a veterinarian hears when listening to amplified heart sounds through a stethoscope. Murmurs can exist at birth or develop later in life.