2024年10月13日 · Ultrasound. The detection of microcephaly usually becomes easier as the gestation advances. The small head is best assessed by using the head circumference (HC). The biparietal diameter (BPD) measurement does not help diagnose microcephaly as the head shape can be misleading 1.

A follow up ultrasound in 3 to 4 weeks is recommended for fetuses with an HC more than 2 SD below the mean. Pathological microcephaly is usually associated with abnormal neurological findings , mental retardation, and sometimes seizures.

What is Microcephaly? A Diagnosis of Microcephaly refers to some babies having a small head when measured by ultrasound during pregnancy, and with a tape measure around the head after birth.

Microcephaly can be diagnosed during pregnancy through ultrasound, or after the baby is born. Prenatal diagnosis of microcephaly can be done late in the second or early in the third trimester. To diagnose microcephaly after birth, a healthcare …

Fetal ultrasound can assess the head size of a growing fetus and detect microcephaly in the second trimester of pregnancy. When the baby is born, a measurement of head size — occipital frontal circumference (OFC) — can diagnose microcephaly.

ultrasound A small fetal head circumference (below 5th centile corrected for age sex and race). Problem: 5% of normal infants with a small head may be considered microcephalic .

Fetal brain MRI at ≥32 weeks’ gestation for diagnosis of abnormalities of neuronal migration, such as lissencephaly and polymicrogyria. Ultrasound scans every 4 weeks to monitor the evolution of head circumference. Standard obstetric care and delivery.

Ultrasonography (US) is currently the most commonly used imaging modality for detecting microcephaly in the second trimester of pregnancy. However, antenatal brain magnetic resonance imaging (MRI) is increasingly being used as a more sensitive tool to identify structural abnormalities that may suggest a specific diagnosis.

Microcephaly is a clinical syndrome where the head circumference (taken at the level of the transthalamic plane) is below normal. If three standard deviations below the mean is used as the threshold for diagnosis, the incidence is 0.1 per cent.

Prenatally, the diagnosis of microcephaly sometimes is made with ultrasound done in the late second or early third trimester. Postnatally, evaluation should include detailed prenatal history to identify risk factors, developmental and neurologic assessment, and brain MRI or CT.