Renal descent of 5 cm or two vertebral bodies on standing.
Associated with abdominal pain and vomiting when upright with relief when lying down.
Pain caused by intermittent kidney obstruction or traction of renal artery or perirenal nerves.
Diagnosis by intravenous pyelogram and or renography demonstrating renal descent and decrease in renal blood flow on orthostasis.
Common in slim young females but rarely causes symptoms.
Fixation of the kidney (nephropexy) is the treatment.