Newman, Christine, Stephen Connolly, Owen MacEneaney, Conor O'Keane, and Siobhan E McQuaid. “Leydig Cell Hyperplasia Mimicking a Testicular Tumour in a Patient With Klinefelter Syndrome”. European Journal of Case Reports in Internal Medicine 6, no. 6 (June 7, 2019). Accessed November 3, 2026. https://ejcrim.com/index.php/ejcrim/article/view/1129.