was visualized. The abdominal CT scan revealed a 7 cm

cystic mass involving the right ovary with small areas of calcification. There

were no abnormalities in the size of the uterus. The right fallopian tube and

ovary were removed surgically. On sectioning, the mass was filled with abundant

hair and sebum. Microscopically, the mass had glandular spaces lined by

columnar epithelium, squamous epithelium with hair follicles, cartilage, and

dense connective tissue. What type of tumour is it?