Invasive breast carcinoma - IARC
Invasive breast carcinoma - IARC
Invasive breast carcinoma - IARC
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Cells typical of <strong>carcinoma</strong> in situ are<br />
arranged singly or in syncytial aggregates<br />
(indistinct cell borders and<br />
overlapping nuclei). Cytoplasm is<br />
s c a rce or absent; nuclei are round to<br />
o v a l .<br />
Prognosis and predictive factors<br />
Systematic reviews of randomized controlled<br />
trials in subjects who underwent<br />
cryotherapy, laser ablation, loop electrosurgical<br />
excision procedure (LEEP) or<br />
surgical conization for the treatment of<br />
CIN of any grade reveal no substantial<br />
d i ff e rences in outcome {1777,2068,<br />
2299}.<br />
Fig. 5.16 Cervical intraepithelial neoplasia 1. Cells<br />
have well defined cell borders, slightly enlarged<br />
nuclei and some anisokaryosis.<br />
Fig. 5.17 Cervical intraepithelial neoplasia 3. Cells<br />
have increased nuclear to cytoplasmic ratios,<br />
anisokaryosis and coarsely granular chromatin.<br />
Benign squamous cell lesions<br />
Condyloma acuminatum<br />
Definition<br />
A benign tumour characterized by<br />
p a p i l l a ry fronds containing fibro v a s c u-<br />
lar cores and lined by stratified squamous<br />
epithelium with evidence of HPV<br />
infection, usually in the form of koilocyt<br />
o s i s .<br />
Aetiology<br />
The exophytic condyloma is strongly associated<br />
with HPV types 6 and 11 {3057}.<br />
Histopathology<br />
These lesions exhibit acanthosis, papillomatosis<br />
and koilocytosis. The latter is<br />
characterized by karyomegaly, nuclear<br />
enlargement with binucleation, irregularities<br />
in the nuclear membrane and hyperchromasia.<br />
These lesions closely resemble<br />
vulvar condylomas {585}.<br />
Squamous papilloma<br />
Definition<br />
A benign tumour composed of a single<br />
papillary frond in which mature squamous<br />
epithelium without atypia or koilocytosis<br />
lines a fibrovascular stalk.<br />
Epidemiology<br />
Lesions with a histological appearance<br />
similar to squamous papillomas of the<br />
vagina and vulva are rare in the cervix.<br />
Aetiology<br />
There is no evidence that squamous<br />
papilloma as defined above is or is not<br />
related to human papillomavirus.<br />
Fig. 5.18 Cervical intraepithelial neoplasia 2. Cells<br />
and nuclei vary in size and shape; nuclear chromatin<br />
is hyperchromatic and irregularly distributed.<br />
Macroscopy<br />
The squamous papilloma is usually solitary,<br />
arising on the ectocervix or at the<br />
squamocolumnar junction.<br />
Histopathology<br />
Histological examination shows a single<br />
p a p i l l a ry frond composed of mature<br />
squamous epithelium without atypia or<br />
koilocytosis lining a fibrovascular stalk.<br />
Differential diagnosis<br />
Squamous papilloma is distinguished<br />
from condyloma by the absence of complex<br />
branching papillae and koilocytes.<br />
However, it is important to note that there<br />
may be a time during the evolution of<br />
condylomas when koilocytes are not easily<br />
identifiable.<br />
Squamous papilloma also should be distinguished<br />
from papillary immature metaplasia<br />
of the cervix, which is characterized<br />
by slender filiform papillae and also<br />
does not have koilocytosis {3057}. In the<br />
latter condition the squamous epithelium<br />
is less mature with higher nuclear to cytoplasmic<br />
ratios but lacks nuclear atypia.<br />
Papillary immature metaplasia has been<br />
associated with HPV types 6 or 11<br />
{3057}.<br />
Fig. 5.19 Cervical intraepithelial neoplasia 3 (<strong>carcinoma</strong><br />
in situ). The syncytial aggregate of round to<br />
oval nuclei which have coarsely granular chromatin.<br />
Fibroepithelial polyp<br />
Definition<br />
A polyp lined by squamous epithelium<br />
that contains a central core of fibrous tissue<br />
in which stellate cells with tapering<br />
cytoplasmic processes and irregularly<br />
shaped thin-walled vessels are prominent<br />
features.<br />
Synonym<br />
Stromal polyp.<br />
Aetiology<br />
Unlike condyloma, fibroepithelial polyps<br />
rarely contain HPV nucleic acids {1837},<br />
and, thus, are not related to HPV infection.<br />
Clinical features<br />
This lesion can occur at any age but has<br />
a predilection for pregnant women.<br />
Macroscopy<br />
These are polypoid lesions and are usually<br />
solitary.<br />
Histopathology<br />
These polypoid lesions are characterized<br />
by a prominent fibrovascular stroma cov-<br />
Epithelial tumours 271