Teratoma consists of tissues derived from all the three germ layers, and there may be presence of appendages as a representation of these germ layers as well. Teratomas of the ovary are known to occur in a fairly large number of women. These may be present clinically at a much later stage, permitting a limited treatment plan. Newer diagnostic techniques are always welcome in identifying these lesions. This case report discusses the case of a 40-year-old woman with a large teratoma in the right ovary and its diagnostic and surgical modalities.