A Leydig cell tumor which does not recur or metastasize. Morphologically, there is no evidence of cellular atypia, increased mitotic activity, necrosis, or vascular invasion. The disease is benign Leydig cell tumor (MONDO_0036990, a Monarch Disease Ontology term). Also known as: Leydig cell tumor, benign, adenoma, interstitial, benign Leydig cell neoplasm, benign interstitial cell neoplasm, benign interstitial cell tumor, benign interstitial cell tumour.