True about dermoid cyst of ovary:a) It is teratomab) Frequently undergo torsionc) X-ray is diagnosticd) Invariably turns to malignancye) Contains sebaceous material and hairs

Dermoid cyst: Dermoid cyst is a benign teratoma. – It is most common benign tumour of ovary in reproductive age group. – Most common benign neoplasm diagnosed during pregnancy. Most common Germ cell tumor. It is the commonest tumor to undergo torsion. – Characteristically they are unilocular cyst containing hair and cheesy sebaceous material, teeth, bones, thyroid tissue and cartilage. – If teeth or bone are seen in X-ray in adnexal mass, this finding is pathognomic for teratoma and thus X-ray is diagnostic. – Malignant change in a dermoid cyst occurs in 0.5 – 2% cases in patients > 40 years. Most common malignancy which develops is, squamous cell carcinoma.