March 2021 in “AACE clinical case reports” A man with both Klinefelter syndrome and primary hyperparathyroidism showed a rare combination of symptoms and genetic patterns.
December 2024 in “Australasian Journal of Dermatology” Topical finasteride can cause breast enlargement and tenderness in men.
April 2024 in “JCEM case reports” A man's breast enlargement from low-dose finasteride for hair loss didn't go away, even with treatment, and might be more common than reported.
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September 2019 in “American Journal of Men's Health” Finasteride may not affect gynecomastia recurrence after mastectomy.
October 2025 in “Journal of the Endocrine Society” A rare pituitary tumor in an 18-year-old male caused hormonal issues and vision loss, requiring surgery and further treatment.