Question: Which pituitary adenoma is common cause of infertility is women?

Context:
Prolactinoma is the most common secreting pituitary adenoma. It is typically diagnosed in women of reproductive age and is common cause of infertility.
Examination of the tissue excised by transsphenoidal excision of the mass showed a pituitary adenoma that stained strongly for FSH. RESULTS: Regular menses resumed soon after excision of the gonadotroph adenoma, followed by a spontaneous pregnancy.
CONCLUSIONS: Gonadotroph adenoma should be suspected in a reproductive age woman with oligomenorrhea or amenorrhea, infertility, multiple preovulatory follicles, and a persistently elevated serum estradiol concentration.
Hyperprolactinemia is the most common endocrine disorder of the hypothalamic-pituitary axis, occurring mostly in women and presenting most commonly with amenorrhea and galactorrhea. Causes of hyperprolactinemia include physiologic, pharmacologic and pathologic factors; pituitary adenoma is a common pathologic cause. Women may present with decreased libido, infertility, oligomenorrhea/amenorrhea and galactorrhea.
When specific treatable underlying causes have been eliminated and in cases of severe hyperprolactinemia, the most likely cause is a prolactin (PRL)-secreting pituitary adenoma. Microadenomas should be treated medically, with a dopamine agonist, if there is an indication for therapy (such as amenorrhea, infertility or bothersome galactorrhea).
Pregnancy in a woman with active acromegaly is very rare, because amenorrhea, due to hyperprolactinemia and disturbed pituitary gonadotropin secretion may cause infertility.
Of the remaining six patients who had been investigated for infertility, no demonstrable cause of infertility was found in three. Of the other three patients, one showed evidence of bilateral tubal occlusion secondary to pelvic inflammatory disease, one has had a right ectopic pregnancy followed by two abortions, and the third patient was found to have a pituitary adenoma.
Results in 136 hyperprolactinaemic women who presented with infertility, amenorrhoea, menstrual irregularities and/or galactorrhoea are reported. There was radiographic evidence of pituitary microadenoma in 21 (15.4%) patients and 5 (3.7%) had macroadenoma.
Patients with pituitary adenoma had a significantly higher (p less than 0.001) baseline serum prolactin level (182 +/- 4.6 ng/ml) than those with no adenoma (59.2 +/- 4.2 ng/ml). All patients in the study were treated with bromocriptine (2.5-10 mg) to normalize serum prolactin or to achieve a pregnancy.
There was no significant difference in the pregnancy rate between the patients with or without pituitary adenoma.
Two hyperprolactinemic infertile women, one with and one without a pituitary adenoma, who were resistant to bromocriptine treatment, were treated orally with Hachimijiogan, a Chinese herbal medicine.
Infertility caused by hyperprolactinemic amenorrhea may be complicated by pituitary adenoma.

Answer: Prolactinoma is a pituitary adenoma that is strongly associated with infertility in women mainly due to increased prolactin secretion causing hyperprolactinemia. Other pituitary lesions can also be associated with infertility.
Exact answer: prolactinoma