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Eble JN, Sauter G., Epstein JI, Sesterhenn IA - iarc

Eble JN, Sauter G., Epstein JI, Sesterhenn IA - iarc

Eble JN, Sauter G., Epstein JI, Sesterhenn IA - iarc

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prominent basal epithelial cell layer<br />

{2453,2549,2770}.<br />

Condyloma acuminatum and caruncle<br />

Urethral condylomas are flat or polypoid<br />

and are not always associated with external<br />

genital disease {583,795}. Caruncles<br />

are inflammatory polyps of the female<br />

urethra and must be distinguished from<br />

exophytic inflammatory pseudotumour,<br />

urothelial carcinoma or metastatic<br />

tumour {127,1557,2903}.<br />

Non-epithelial tumours of the<br />

urethra<br />

Malignant tumours<br />

Malignant melanoma has been<br />

described in the male and female urethra.<br />

In male, the distal urethra is the most<br />

common site. Amelanotic melanoma may<br />

mimic urethral carcinoma {2130}.<br />

Other reported non-epithelial tumours<br />

are primary non-Hodgkin lymphoma<br />

{127,1325} and sarcomatoid carcinoma<br />

{1352,2160}. Lymphoma or sarcomatoid<br />

carcinoma has to be differentiated from<br />

atypical stromal cells described in urethral<br />

caruncles with pseudoneoplastic<br />

histology {2897}.<br />

Benign tumours<br />

Leiomyoma shows immunohistochemically<br />

positive staining for vimentin, desmin<br />

and actin {72}. Periurethral leiomyoma<br />

has been described associated with<br />

esophageal and rectal leiomyomatosis<br />

{969}. Leiomyoma is more frequent in<br />

female urethra, but has been described<br />

also in the male {1740}. Haemangioma<br />

occurs in the bulbar {2020} or prostatic<br />

urethra {825}. Localized plasmacytoma<br />

has been shown to be treated by excisional<br />

biopsy {1473}.<br />

Tumours of accessory glands<br />

Bulbourethral gland carcinomas may<br />

show a mucinous, papillary, adenoid<br />

cystic, acinar or tubular architecture,<br />

while rare mucinous and papillary adenocarcinomas<br />

of the paraurethral glands<br />

have been reported {301,1292,2414,<br />

2440}. Female periurethral gland adenocarcinomas<br />

are clear cell, mucinous or,<br />

rarely, prostatic. {2466}.<br />

Tumours of the urethra 157

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