[Leydig cell testicular tumour with an endocrine syndrome. Clinical, biological, ultra-structural and histo-enzymatic study (author's transl)].

With respect to a particularly demonstrative case of Leydig cell tumour with gynaecomastia in a 40 year old man, the authors review the current data in the literature concerning the clinical and biological features and treatment of this tumour. They pay particular attention to the classical anatomo-pathological features, the ultra-structure and the ultrastructural and histo-enzymatic appearances.