label: Testicular Leydig Cell Tumor
label_lc: testicular leydig cell tumor
description: A sex cord-stromal tumor that arises from the testis and is characterized by the presence of cells that resemble the successive stages of development of Leydig cells.  It usually presents as a painless testicular mass.  Gynecomastia is present in approximately thirty percent of the cases.  Libido may be decreased.  In children, precocious puberty may be present.  A minority of cases exhibit malignant characteristics.