Chiari-II malformation

Case contributed by Dr Prashant Mudgal

Presentation

23 weeks pregnant for routine obstetric antenatal check up.

Patient Data

Age: 21 years
Gender: Female
Modality: Ultrasound

The skull shape is abnormal and reveals bilaterally symmetric indentation over the frontal bone giving it a typical appearance called lemon skull sign. The cerebellum appears smaller than normal for gestational age and it is abnormal in shape (curved/banana shaped), so called banana cerebellum.

The above findings are associated with a thin walled cystic lesion with internal echoes noted posterior to lumbosacral spine, the lesion shows communication with the spinal canal and there Lumbosacral spina bifida signifies myelomeningocele.

Imaging features are suggestive of Chiari II malformation.

Case Discussion

Chiari II malformation is relatively common congenital anomaly with an incidence of 1:1000 live births. It can be associated with wide range of skeletal and CNS anomalies.

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Case Information

rID: 42292
Case created: 14th Jan 2016
Last edited: 14th Jan 2016
System: Obstetrics
Tag: pm
Inclusion in quiz mode: Included

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