[Primary hyperthyroidism after excision of a Struma ovarii].

Area of Science:

• Gynecologic Oncology
• Endocrinology
• Reproductive Medicine

Background:

• Struma ovarii is a rare germ cell tumor consisting of thyroid tissue.
• It can present as an ovarian mass and occasionally cause hyperthyroidism or hypothyroidism.
• Management strategies vary, particularly in women desiring fertility.

Observation:

• A 35-year-old woman presented with a left ovarian mass.
• Pathology confirmed the diagnosis of Struma ovarii.
• The tumor was initially partially excised to preserve fertility, followed by a successful pregnancy.

Findings:

• The Struma ovarii was completely removed during a cesarean section after delivery.
• Postpartum hypothyroidism was diagnosed 60 days after childbirth.
• Treatment with levothyroxine successfully restored euthyroidism.

Implications:

• This case demonstrates a successful fertility-sparing approach to Struma ovarii.
• It underscores the potential for delayed thyroid dysfunction following surgical management.
• Hormone replacement therapy is effective for managing postpartum hypothyroidism in such cases.