Banana sign (cerebellum)
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The banana sign, is one of the many a notable fruit inspired signs. It is seen on axial imaging through the posterior fossa of fetus as a sign of a Chiari II malformation. It describes the way the cerebellum is wrapped tightly around the brain stem as a result of spinal cord tethering and downward migration of posterior fossa content. The cisterns magna gets obliterated. The shape of the cerebellum has appearance of a banana
It is also seen in the majority of fetuses with spina bifida, but disappears after 24 weeks. It is only rarely seen in a normal fetus. There is very frequent concurrent hydrocephalus.
Associated signs
The same condition also gives rise to the lemon sign.
-<p>The <strong>banana sign</strong>, is one of the many a notable <a href="/articles/fruit_inspired_signs">fruit inspired signs</a>. It is seen on axial imaging through the posterior fossa of fetus as a sign of a <a href="/articles/chiari-ii-malformation">Chiari II malformation</a>. It describes the way the cerebellum is wrapped tightly around the brain stem as a result of <a href="/articles/spinal-cord-tethering">spinal cord tethering</a> and downward migration of posterior fossa content. The cisterns magna gets obliterated. The shape of the cerebellum has appearance of a banana</p><p>It is also seen in the majority of fetuses with <a href="/articles/spina-bifida" title="Spina bifida">spina bifida</a>, but disappears after 24 weeks. It is only rarely seen in a normal fetus. There is very frequent concurrent <a href="/articles/hydrocephalus">hydrocephalus</a>.</p><h5>Associated signs</h5><p>The same condition also gives rise to the <a href="/articles/lemon_sign">lemon sign</a>.</p>- +<p>The <strong>banana sign</strong>, is one of the many a notable <a href="/articles/fruit-inspired-signs">fruit inspired signs</a>. It is seen on axial imaging through the posterior fossa of fetus as a sign of a <a href="/articles/chiari-ii-malformation">Chiari II malformation</a>. It describes the way the cerebellum is wrapped tightly around the brain stem as a result of <a href="/articles/spinal-cord-tethering">spinal cord tethering</a> and downward migration of posterior fossa content. The cisterns magna gets obliterated. The shape of the cerebellum has appearance of a banana</p><p>It is also seen in the majority of fetuses with <a href="/articles/spina-bifida">spina bifida</a>, but disappears after 24 weeks. It is only rarely seen in a normal fetus. There is very frequent concurrent <a href="/articles/hydrocephalus">hydrocephalus</a>.</p><h5>Associated signs</h5><p>The same condition also gives rise to the <a href="/articles/lemon-sign">lemon sign</a>.</p>
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Image 3 Ultrasound (Transverse) ( create )
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