[Low bone mass in a 17-year-old girl in the course of yolk sac tumor treatment--case report].

The aim of the paper was to present symptoms and results of biochemical and densitometric examination in a 17-year-old girl. The girl had yolk sac tumor at the age of 12, in course of which she developed secondary osteoporosis.

[Comparison of body fat measurement methods in children].

Introduction: In the last decades the prevalence of overweight and obesity in pediatric population has increased. The cardiovascular diseases and type 2 diabetes are the consequences of fat tissue disturbances, so measurements of body fat in children might be expedient. Aim of the study was to compare the results of percent body fat measured on bioelectric impedance (BIA) and anthropometric method with reference method--dual-energy X-ray absorptiometry (DXA).