Assertion: amenorrhea's cause | /r/HasProperty | gonadotropin deficiency
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Source sentences:
text: Pituitary causes of oligomenorrhea include hyperprolactinemia (high serum prolactin concentrations), without or with galactorrhea (inappropriate lactation), and gonadotropin deficiency, such as that caused by a nonsecreting pituitary tumour or other disorder that results in decreased pituitary function.