The coexistence of 2 genetic diseases can mutually modify their course. We describe the case of a 10-year-old boy with Sliver-Russell syndrome (SRS) and Duchenne muscular dystrophy (DMD). The patient's short stature, which is part of the clinical picture of both diseases, has been additionally aggravated by the steroid therapy, which is necessary to delay the progression of DMD. From the age of 9 years, the patient was treated with recombinant human growth hormone (rhGH) for 18 months. The following study discusses whether rhGH therapy in a child with SRS and DMD may alleviate or worsen the course of DMD, and how it affects carbohydrate metabolism disorders.