PMC6437748_01
Case one: a 23-year-old woman with right ovarian mass.
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fig1
Slicing through the mass revealed a lesion with predominantly tan to whitish grey solid component with few cystic cavities (Figure 1(a)).  There were islands of mature brain tissue, adipose tissue, cartilage, and skeletal muscles in the stroma (Figure 1(b)). 
PMC6437748_02
Case two: A 10-year-old girl with right ovarian mass.
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fig2
The cysts were filled with cream-coloured semisolid material (Figure 2(a)).  The immature mesenchymal elements were cartilage, bone, skeletal muscle, and ocular elements (Figure 2(b)). 
PMC6437748_03
Case three: A 20-year-old woman with left ovarian mass. Sections of the ovarian mass from a 20-year-old woman showing immature neuroectodermal elements forming tubules and solid masses (X10 and X 40).
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fig3
There were areas of haemorrhages and necrosis (Figure 3). 