What is the prevalence of cystic teratomas?

Updated: Nov 22, 2019
  • Author: Chad A Hamilton, MD; Chief Editor: Yukio Sonoda, MD  more...
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Sacrococcygeal teratomas (SCT) are the most common tumors in newborns, occurring in 1 per 20,000-40,000 births. [5, 9] A population-based (rather than tertiary referral center) estimate from the United Kingdom found a birth prevalence of 1 per 27,000 live births. [10]  A retrospective study of newborns diagnosed with SCT in southern Sweden from 2000 to 2013 found an overall incidence of approximately 1 per 14,000 live births, with overall mortality of 11%. [11]

Mature cystic teratomas account for 10-20% of all ovarian neoplasms. They are the most common ovarian germ cell tumor and also the most common ovarian neoplasm in patients younger than 20 years. They are bilateral in 8-14% of cases. [4, 3, 12, 13]

The incidence of all testicular tumors in men is 2.1-2.5 cases per 100,000 population. Germ cell tumors represent 95% of testicular tumors after puberty, but pure benign teratomas of the testis are rare, accounting for only 3-5% of germ cell tumors. The incidence of all testicular tumors in prepubertal boys is 0.5-2 per 100,000, with mature teratomas accounting for 14-27% of these tumors. It is the second most common germ cell tumor in this population. [14, 15]

Benign teratomas of the mediastinum are rare, representing 8% of all tumors of this region. [16]

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