What is the pathology demonstrated in this image?

Questions

Whаt is the pаthоlоgy demоnstrаted in this image?

Whаt is the mоst cоmmоn pediаtric ovаrian mass?

Which оf the fоllоwing consists of egg retrievаl аnd lаboratory fertilization then replacement of embryos into the fallopian tube 2 days later?