A 12mm widening of the posterior cranial fossa pool in a 35 week fetus is a mild widening, and a 12mm widening of the posterior cranial fossa pool is not serious if there are no abnormalities in the amniocentesis results, or more serious if there are abnormalities.
During fetal development, if the brain develops faster than the cerebral aqueduct, it will result in the production of cerebrospinal fluid in the brain that exceeds the aqueduct’s ability to absorb it, and this will result in ventricular dilatation. Usually the width of the posterior cranial fossa pool is normal up to 10mm, 10-15mm is considered mild widening, and 15mm or more is considered abnormal.
Therefore, when there is a 12mm widening of the posterior cranial fossa pool in a 35-week fetus, parents do not need to worry too much, with the development of the fetus, most of the cerebrospinal fluid can be self-absorbed, and the widening of the posterior cranial fossa pool will gradually return to normal. However, if the widening of the posterior fossa continues during observation, further examination is needed, except for abnormalities in brain development.
It is recommended to go to the hospital for timely treatment of widening of the posterior fossa, and take appropriate treatment under the guidance of the doctor, so as to promote the alleviation of the uncomfortable situation.