Banana sign (cerebellum)
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At the time the article was created Frank Gaillard had no recorded disclosures.
View Frank Gaillard's current disclosuresAt the time the article was last revised Rohit Sharma had no financial relationships to ineligible companies to disclose.
View Rohit Sharma's current disclosures- Banana cerebellum
The banana sign is one of the many notable fruit inspired signs.
This sign is seen on axial imaging through the posterior fossa of fetuses with associated conditions such as Chiari II malformation and/or spina bifida.
In Chiari II malformation, the banana sign describes the way the cerebellum is wrapped tightly around the brainstem as a result of spinal cord tethering and downward migration of the posterior fossa contents. This results in obliteration of the cisterna magna and subsequently, the shape of the cerebellum has the appearance of a banana. The sign persists into the second and third trimesters.
The banana sign is also seen in the majority of fetuses with spina bifida. The ultrasound appearance of the banana sign is secondary to the abnormality of the cerebellar shape3. In patients with spina bifida, this appearance disappears after 24 weeks. There is frequently concurrent hydrocephalus.
Associated signs
The same condition also gives rise to the lemon sign.
References
- 1. Reuter KL, Babagbemi TK. Obstetric and gynecologic ultrasound. Mosby Inc. (2006) ISBN:0323039766. Read it at Google Books - Find it at Amazon
- 2. Weissleder R, Wittenberg J, Harisinghani MM et-al. Primer of Diagnostic Imaging, Expert Consult- Online and Print. Mosby Inc. (2011) ISBN:0323065384. Read it at Google Books - Find it at Amazon
- 3. Benacerraf BR, Stryker J, Frigoletto FD. Abnormal US appearance of the cerebellum (banana sign): indirect sign of spina bifida. (1989) Radiology. 171 (1): 151-3. doi:10.1148/radiology.171.1.2648467 - Pubmed
Incoming Links
- Chiari malformation - type II
- Chiari II malformation
- Chiari II malformation
- Lemon and banana sign
- Chiari II malformation
- Occipital meningocele - antenatal ultrasound
- Neural tube defect in monochorionic diamniotic twin pregnancy
- Spina bifida: myeloschisis with Chiari II - prenatal diagnosis
- Chiari-II malformation
- Myelomeningocoele - fetal
- Lemon and banana sign
- Myelomeningocoele
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