Dinosaur Tail Appendix in Trisomy 13

Background Among the many malformations associated with trisomy 13, one of the less recognized is dinosaur tail appendix. Case report: We illustrate a dinosaur-tail appendix from an autopsy in a newborn female with trisomy 13. This malformation has a frequency between 0.014% and 3.7% in general population. Conclusion: Trisomy 13 is a relatively well-known chromosomal disorder in which dinosaur tail appendix can be found. This entity should be considered element of a complete morphological diagnosis.