Ovarian tumors by incidence and risk of ovarian cancer, with mature cystic<unk>  at bottom and immature<unk>  at right. Embryonal<unk> s most commonly occur in the sacrococcygeal region; sacrococcygeal<unk>  is the single most common tumor found in newborn humans. Of<unk> s on the skull sutures, about 50% are found in or adjacent to the orbit. Limbal dermoid is a choristoma, not a<unk> .<unk>  qualifies as a rare disease, but is not extremely rare. Sacrococcygeal<unk>  alone is diagnosed at birth in one out of 40,000 humans. Given the current human population and birth rate, this equals five per day or 1800 per year. Add to that number sacrococcygeal<unk> s diagnosed later in life, and<unk> s in other locales, and the incidence approaches 10,000 new diagnoses of<unk>  per year.
Teratoma
Lipoma
Embryoma
Dermoid cyst
Gonadoblastoma
Spina bifida
Immature teratoma
Blastoma