Teratomas are embryonal tumours that emerge when totipotent germ cells evade the primary organisers' control over their growth and give rise to contain tissue from all three layers. They cystic or solid, with mature immature components. Histologically, teratomas classified as (benign in 95% of cases) malignant transformation. rare a frequency 1 10,000 births. located more often sacrococcygeal r...