The classification of purpuras has long been a vexed question. The difficulty lies in the belated appreciation that purpura is a symptom and not a disease, while at the same time the word purpura is still retained for use in the classification of those diseases in which it is merely part of the symptom complex. The difficulty would appear to be insuperable with our present very limited knowledg...

We show that if C is the category of models for a theory in the sense of Linton over an arbitrary base category, then a full subcategory of C is closed under Homomorphic images that split in the underlying category, under M -Subobjects for a class M of monomorphisms and under Products if and only if it is an intersection of a nest of subcategories, each determined from the preceding by a class ...

BACKGROUND The most appropriate management of Henoch-Schönlein Purpura (HSP) nephritis with nephrotic-range proteinuria remains uncertain. The aim of this study was to evaluate the clinical therapeutic effects of mycophenolate mofetil and low-dose steroid in Henoch-Schönlein purpura nephritis (HSPN) with nephrotic-range proteinuria and pathological classification less than IV in children. MATER...

Henoch-Schönlein purpura (HSP) is an acute smallvessel leucocytoclastic vasculitis. HSP is the most common vasculitis in children, with an incidence of about 10 cases per 100 000 a year. In most series, boys are aff ected more often than girls. Although it can occur at any age, HSP is overwhelmingly a disease of childhood. The mean age of patients is 6 years; 75% of patients are under 8 years o...