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)
Heart murmurs are extra and abnormal heart sounds that may be an indication of a problem in the cardiac cycle. Murmurs sound like clicks, knocks, snaps or whooshing. The four normal heart sounds are a consequence of vibration of the flow of blood and closure of the heart valves. Similarly heart murmurs are a result of vibration caused by turbulent flow or abnormal closure of the heart valves. A murmur is not always an indication of a problem though and most are benign or innocent murmurs.