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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

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