* To determine the most common clinical characteristics in patients with childhood -onset systemic lupus erythematosus. * To detect prevalence of low bone mineral density in patients with childhood -onset systemic lupus erythematosus.
Age of patients below 18 years old.
Both sexes.
The Patients should be diagnosed as SLE, according to 2019 European league against rheumatism (EULAR)/ American college of rheumatology (ACR) SLE classification criteria from >6 months ago.
Patients with autoimmune diseases other than CSLE.
Patients not fulfilling the criteria for diagnosis of CSLE.
Active infections.
Malignancies.