Inclusion of the urinary system in this short book on radiology is predicated
on the fact that the urinary system helps the human body, according to this author, “to
maintain physiological sanity.” So much enters the body through the gastrointestinal
system, the skin, and the respiratory system, with the urinary system as the major
system responsible for the excretion of metabolic products of food, drugs, and toxic
substances. Accumulation of any of these products without a concomitant and
expeditious excretion would put the human being at risk of disease (acute or chronic)
and premature death.
Due to the complexity of the renal system, there may be congenital abnormalities just
as there are many acquired abnormalities – the acquired abnormalities are not
necessarily structural ab initio but may start as functional derangements that, over time,
cause enough damage to cause structural changes.
Keywords: Ascending urethrography, ASU, Hysterosalpingography, Intravenous pyelogram, Retrograde urethrography, RUG.
