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| Diprospus |
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| Also known as Craniofacial duplication, is found rarely. In this disorder, a duplicate face appears on the head. It happens due to excess of the protein “sonic hedgehog homolog”. Children born with this abnormality do not survive birth generally. |
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| 2 |
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| Fetus in Fetu |
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| It is a rare phenomenon where twins get connected to each other and one twin ends being partly inside or outside its twin. Many times, the fetus in fetu is not detected until it causes problems to the host. But in some cases, it becomes prominent. |
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| 3 |
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| Proteus Syndrome |
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| It is a case of overgrowth of bone and skin and often includes tumours. The disease was officially recognized in 1979. Since then 200 people have been diagnosed around the world having this disease. However, the victims of this disease do not suffer from any brain abnormalities. |
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| Möbius Syndrome |
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| It is an abnormality found rarely. In this, the muscles of the face get paralyzed. Many times, patients are not able to move their eyes. Neither any treatment has yet been discovered for this disease nor are the reasons completely known. |
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