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A prolactinoma is a type of pituitary tumor that secretes the hormone prolactin. Prolactin is a protein hormone produced by the pituitary gland that plays a role in milk production in mammals.12

In women, excess prolactin from a prolactinoma can lead to irregular menstrual cycles, infertility, and abnormal lactation (galactorrhea). In men, it can cause decreased libido, erectile dysfunction, and infertility. These tumors are the most common type of hormone-secreting pituitary tumor and are more frequent in women, though they tend to be larger in men at diagnosis.12

Treatment typically involves dopamine agonist drugs, which reduce prolactin secretion and tumor size. Surgery or radiation therapy may be used if drugs are ineffective or cause side effects.12

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  1. prolactin
  2. pituitary tumour

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