Prevalence, Clinical Characteristics and Risk Factors of Post-COVID-19 Condition in a Multicenter Pediatric Primary and Hospital Care Cohort.

The prevalence of post-COVID-19 condition is not well defined. We describe a cohort of 244 children diagnosed with COVID-19 and followed up for 6 months, in which 4.9% of patients had persistent symptoms at 12 weeks.

Childhood idiopathic hypercalciuria--clinical significance of renal calyceal microlithiasis and risk of calcium nephrolithiasis.

Objective: To evaluate the clinical significance of renal calyceal microlithiasis (RCM) in children with idiopathic hypercalciuria (IHC).

Material And Methods: RCM is a renal echographic finding defined as the presence of hyperechogenic spots < 3 mm in diameter in the renal calyces. These spots have been associated with the presence of nephrourological symptoms in children and are considered to represent a stage prior to urolithiasis.