Common deformity in chiari H malformation is

NEET PG
#1

Common deformity in chiari H
malformation is -
a) Syringomyelia
b) Meningo myelocele
c) Hydrocephalus
d) All of above
Correct Answer - D
Answer- D. All of above
Chiari malformation is divided into :

  1. Type I : Produce symptoms during adolescence or adulthood is
    usually not associated with hydrocephalus. The deformity consists of
    displacement of cerebellar tonsils into the cervical canal.
  2. Type II : It is characterized by progressive hydrocephalus with a
    myelomeningocele in newborns. There is a failure of pontine flexure
    during embryogenensis, which results in elongation of 4th ventricle;
    kinking of brainstem and breaking of quadrigeminal plate (tectum);
    along with displacement of inferior vermis, pons and medulla into
    cervical canal. This causes widening of cervical canal
    (syringomyelia).
  3. Type III : Usually associated with occipital encephalocele and
    causes abundant neurological deficit.
  4. Type IV : Characterised by lack of cerebeller development and
    usually not compatable with life.