An extremely rare case of pituitary functioning gonadotroph microadenoma accompanied by ovarian hyperstimulation syndrome in a woman of reproductive age.

OBJECTIVE

To report a case of pituitary functioning gonadotroph microadenoma accompanied by ovarian hyperstimulation syndrome (OHSS) in a woman of reproductive age.

DESIGN

A case report.

SETTING

Tertiary care unit of a university hospital.

PATIENTS

A 42-year-old parous woman with bilateral ovarian enlargement presumed to be secondary to a functioning gonadotroph pituitary microadenoma.

INTERVENTIONS

Oral contraceptives and endoscopic transsphenoidal surgery for adenoma that initially could not be visualized on a magnetic resonance imaging (MRI) scan.

MAIN OUTCOME MEASURES

Medical and radiographic assessment of endogenously induced OHSS and its resolution after treatment.

RESULTS

The patient was diagnosed with OHSS secondary to elevations in endogenous levels of follicle-stimulating hormone (FSH). The cranial contrast-enhanced MRI scan did not show any apparent tumor in the pituitary gland. She was, therefore, treated with oral contraceptives, which resulted in a modest resolution of ovarian enlargement; however, this treatment became ineffective 3 years later. A small pituitary adenoma (maximum diameter of 8 mm) was suspected on repeated MRI (2 years after the first MRI). Selective adenomectomy was performed, which resulted in normalization of the ovarian size and resumption of regular menstrual cycles.

CONCLUSIONS

We report a case of a functional pituitary microadenoma secreting FSH in quantities significant enough to result in OHSS. The excessive FSH production was resistant to medical therapy; however, surgical treatment was ultimately successful.