![]() An occult spinal lesion has been reported in around 50% of the cases. ![]() The preoperative assessment includes a complete clinical examination including neurology, plain radiographs of the spine and computed tomography or magnetic resonance imaging. In our series, we had only one patient with tail in sacrococcygeal teratoma. In a review series of 48 skin-covered lumbosacral masses, 25% had lumbosacral and sacrococcygeal teratomas. Teratoma in the human tail has also been reported. Human tail usually occurs in the lumbosacral region, but it has also been reported in the cervical region. The additional lesions found with pseudo tails are lipomas, teratomas, chondromegaly and gliomas, and there may be elongated parasitic fetus. ![]() They are anomalous prolongation of the coccygeal vertebrae. Pseudo tails have got superficial resemblance to true tails. A true tail is easily removed surgically, without residual effects. Only one case has been reported with vertebra in human tail. Unlike the tail of other vertebrates, human tails do not contain vertebral structures. None of our patients showed any movement of the tail. It can move and contract and occurs twice as often in males as in females. Bone, cartilage, notochord and spinal cord are lacking. It contains adipose tissue, connective tissue, central bundles of striated muscle, blood vessels and nerves and is covered by skin. True human tail arises from the most distal remnant of the embryonic tail. The persistent tail probably arises from the distal nonvertebrate remnant of the embryonic tail. During the 5 th to 6 th week of intrauterine life, the human embryo has a tail with 10–12 vertebrae. A “vestigial tail” describes a remnant of a structure found in embryonic life or in ancestral forms.
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