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[Revision of the 1992 edition of the WHO histological typing of odontogenic tumors. A suggestion].
[dentin dysplasia]
The
WHO
classification
of
odontogenic
tumors
(
1992
,
OT
)
was
revised
.
The
following
main
changes
were
proposed
:
(
1
)
OT
are
not
only
"
related
to
"
odontogenic
tissues
but
are
derived
from
these
;
(
2
)
the
stroma
of
the
epithelial
tumor
group
(
1
.
1
.
1
)
is
of
a
fibrous
nature
and
does
not
contain
any
ectomesenchymal
component
;
(
3
)
subtypes
of
ameloblastomas
have
to
be
differentiated
(
intra-
,
extraosseous
,
desmoplastic
,
unicystic
)
;
(
4
)
eponyms
are
no
longer
used
in
the
revised
classification
;
(
5
)
the
AOT
is
reclassified
as
an
epithelial
OT
;
(
6
)
a
neoplastic
and
non-neoplastic
line
of
the
ameloblastic
fibroma
and
ameloblastic
fibrodentinoma
is
proposed
;
(
7
)
the
calcifying
ghost
cell
odontogenic
tumor
is
included
in
the
classification
;
(
8
)
the
simple
and
the
WHO
type
of
odontogenic
fibroma
are
included
in
the
classification
;
(
9
)
the
classification
of
malignant
OT
is
adapted
from
Eversole
(
1999
)
with
a
few
changes
.
In
particular
,
ameloblastic
carcinoma
is
differentiated
from
malignant
(
metastasizing
)
ameloblastoma
;
(
10
)
the
term
carcinoma
in
intraosseous
(
peripheral
)
ameloblastoma
is
introduced
.
Also
,
the
malignant
epithelial
odontogenic
ghost
cell
tumor
is
termed
calcifying
ghost
cell
odontogenic
carcinoma
;
(
11
)
the
clear
cell
odontogenic
tumor
is
termed
clear
cell
odontogenic
carcinoma
;
(
12
)
the
so
-called
pseudocysts
are
termed
"
cavities
"
(
aneurysmal
bone
cavity
,
simple
bone
cavity
,
lingual
and
buccal
mandibular
bone
cavity
,
focal
marrow-containing
jaw
cavity
)
.
