Ovarian dermoid cyst

A 68 year old female presented with painless pelvic swelling. Ultrasound showed an 8cm complex cyst with thickened wall and echogenic material inside the cyst. The 2nd image showed 'tip of iceberg' sign ie due to the intense echogenicity, the posterior shadowing does not show the true size of the echogenic material. The findings are consistent with an ovarian dermoid cyst.