Pyelitis in Infancy a Pathological Study.

The clinical picture of 'pyelitis in infancy " is so familiar to anyone (lcaling with children, and is so gliblv spoken of in text-books and medical journals, that one would imagine the disease had a definitely established pathological basis. This is not the case. It was in an attempt to establish this basis that the present study was undertaken. In the presentation of the (lata I shall give first the evidence as to the site and nature of the lesion as shown by the pathological observations of previous authors, alnd by my own stuidies; then that derived from surgical procedures; and, finally, the little so far obtained by cystoscopic methods. I shall then deal with less completelv certain aetiological factors. The subject has been confined to a discussion of the disease as it occurs in infants of two years and less cases of obvious congenital malformation and those complicated by stone have been omitted.