Dermoid cyst of ovary

Dermoid cyst arises from-

A. Germ cells arrested after the first meiotic division.
B. Stem cells
C. Blastomeres
D. Arrested growth of yolk sac derivatives

Most common malignancy seen in ovarian teratoma

A. Osteosarcoma
B. Adenocarcinoma
C. Squamous cell carcinoma
D. Melanoma

Best to diagnose teratoma is –

A. Sonography
B. Computed tomography
C. Rokitansky protuberance in macroscopy
D. Neovascularization in USG

Which of the following dermoid type is associated with hyperthyroidism

A. Monodermal teratomas
B. Immature teratomas
C. Mature cystic teratoma
D. Fetiform teratomas

All are true about Rokitansky’s protuberance except

A. Rare site of malignant transformation
B. Also called a dermoid plug
C. Solid tissue projection into the cyst
D. Covered by skin with sweat and sebaceous glands

All are ultrasound features of mature cystic teratoma except

A. Tip of the iceberg sign
B. Dot-dash sign
C. Palm tree-like protrusion
D. Comet tail appearance

In short

Sonographically, mature cystic teratomas may seem as purely or predominantly cystic, solid or a complex mass with high reflection and acoustic shadowing. The various signs are

  • Tip of the iceberg sign
  • Dot-dash sign
  • Comet tail appearance
  • Thin echo pat-tern” or “dense echo pattern”
  • Shadowing echodensity (Rokitansky nodule or dermoid plug)
  • Diffuse or regional high-amplitude echoes
  • Fat-fluid or fluid-fluid level
  • Floating balls sign

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