Physicians
have
known
for
almost
a
century
that
some
childhood
lesions
histologically
____________________
as
melanomas
did
not
show
malignant
behavior
.
The
terms
____________________
melanoma
and
prepubertal
melanoma
____________________
used
to
describe
____________________
lesions
.
Several
attempts
were
____________________
to
establish
objective
criteria
that
would
clearly
delineate
Spitz
____________________
and
melanomas
.
The
controversial
classification
of
____________________
cases
as
metastasizing
Spitz
nevi
further
confounded
the
____________________
;
however
,
such
cases
illustrate
the
difficulty
of
accurately
____________________
some
Spitz
nevi
from
melanoma
based
on
histological
criteria
____________________
.
Even
today
,
no
set
of
criteria
can
be
used
to
predict
the
clinical
outcome
____________________
atypical
Spitz
tumors
with
absolute
assurance
.
