Webb J A, Fry I K, Charlton C A
Br J Radiol. 1975 Aug;48(572):674-7. doi: 10.1259/0007-1285-48-572-674.
Three cases in which there was an anomalous short calyx without a papilla in the mid kidney are described. This is believed to be a developmental abnormality which is associated with a pelvicalyceal pattern of two major calyces, and with renal "pseudotumour". It is important to recognize this calyceal appearance in order to distinguish it from calyceal disease.