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[The total absence of xanthine oxidase activity. Apropos 2 cases of the nonfamilial incidence of xanthinuria].
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The
lack
of
activity
of
the
xanthine-oxidase
conversion
produces
hypouricemia
and
hypocuria
,
with
high
urine
elimination
of
xanthine
and
hypoxanthine
.
Due
to
the
low
solubility
,
it
can
result
in
urinary
lithiasis
.
Two
rare
cases
of
xanthinuria
caused
by
total
lack
of
xanthine-oxidase
are
presented
.
A
differential
diagnosis
of
several
congenital
metabolic
purine
defects
was
carried
out
.