镜下畸胎瘤右边有软骨、脂肪组织、和肠内腺体，左边有很多甲状腺组织，被称为卵巢甲状腺肿，很少引起甲状腺机能亢进。
Microscopically, this teratoma has cartilage, adipose tissue, and intestinal glands at the right, while at the left is a lot of thyroid tissue. This condition can be termed struma ovarii. Rarely, a struma ovarii can even be a cause for hyperthyroidism.