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

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

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Miscellaneous tumours<br />

P.H. Tan<br />

L. Cheng<br />

M. Furusato<br />

C.C. Pan<br />

ICD-O codes<br />

Cystadenoma 8440/0<br />

Wilms tumour (nephroblastoma) 8960/3<br />

Malignant rhabdoid tumour 8963/3<br />

Clear cell adenocarcinoma 8310/3<br />

Melanoma of the prostate 8720/3<br />

Paraganglioma 8680/1<br />

Neuroblastoma 9500/3<br />

Cystadenoma<br />

Also known as multilocular cyst or giant<br />

multilocular prostatic cystadenoma, it is<br />

a rare entity characterized by benign<br />

multilocular prostatic cysts that can<br />

enlarge massively. Affected men are<br />

aged 20-80 years, presenting with<br />

obstructive urinary symptoms, with or<br />

without a palpable abdominal mass<br />

{1324}. Postulated causes include<br />

obstruction, involutional atrophy {1594},<br />

or retrovesical ectopic prostatic tissue<br />

with cystic change {2872}.<br />

It occurs between the bladder and the<br />

rectum {62,1501,1611,2872}, either separate<br />

from the prostate or attached to it<br />

by a pedicle. Similar lesions can be<br />

found within the prostate gland.<br />

Cystadenomas weigh up to 6,500 grams,<br />

ranging from 7.5 cm to 20 cm in size.<br />

They are well-circumscribed, resembling<br />

nodular hyperplasia with multiple cysts<br />

macroscopically. Atrophic prostatic<br />

epithelium lines the cysts, reacting with<br />

antibodies to PSA and PSAP, with high<br />

grade prostatic intraepithelial neoplasia<br />

reported in one case {62}. When cystadenomas<br />

occur within the prostate,<br />

distinction from cystic nodular hyperplasia<br />

may be difficult. Intraprostatic cystadenoma<br />

should be diagnosed only<br />

when half the prostate appears normal,<br />

while the remaining gland is enlarged by<br />

a solitary encapsulated cystic nodule<br />

{1323,1704}.<br />

Prostatic cystadenomas are not biologically<br />

aggressive {1611}, but can recur if<br />

incompletely excised. Extensive surgery<br />

may be necessary because of their large<br />

size and impingement on surrounding<br />

structures.<br />

Wilms tumour (nephroblastoma)<br />

Wilms tumour rarely occurs in the<br />

prostate {386}.<br />

Malignant rhabdoid tumour<br />

Malignant rhabdoid tumour may be<br />

found in the prostate {673}.<br />

Germ cell tumours<br />

Primary germ cell tumours of the prostate<br />

have been rarely described {1046,1725,<br />

2586}. It is critical to exclude a metastasis<br />

from a testicular primary.<br />

Clear cell adenocarcinoma<br />

Clear cell adenocarcinoma resembling<br />

those seen in the Müllerian system may<br />

affect the prostate. It can develop from<br />

the prostatic urethra {636}, Müllerian<br />

derivatives such as Müllerian duct cyst<br />

{874}, or exceptionally, from the peripheral<br />

parenchyma {2004}. Histologically, it is<br />

composed of tubulocystic or papillary<br />

structures lined by cuboidal or hobnail<br />

cells with clear to eosinophilic cytoplasm.<br />

The tumour cells immunohistochemically<br />

do not express prostate specific<br />

antigen and prostate acid phosphatase,<br />

but may express CA-125. The<br />

patient may have elevated serum level of<br />

CA-125.<br />

Melanoma of the prostate<br />

Primary malignant melanomas of the<br />

prostate are extremely rare {2493}.<br />

Malignant melanoma of the prostate<br />

should be distinguished from melanosis<br />

and cellular blue nevus of the prostate<br />

{2208}.<br />

Paraganglioma<br />

Several case reports of paragangliomas<br />

originating in the prostate have been<br />

reported, including one in a child {599,<br />

2747}. Although extra-adrenal paragan-<br />

A<br />

B<br />

Fig. 3.94 Cystadenoma. A CT scan showing a large multinucleated cystic mass within the pelvis, consistent with prostatic cystadenoma. B Gross section discloses<br />

large multicystic tumour.<br />

Haematolymphoid tumours /Secondary tumours involving the prostate / Miscellaneous tumours 213

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