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

Tumours of collecting ducts and rete
L. Nochomovitz
Adenoma
Definition
A benign tumour of rete epithelial origin
that occurs within the dilated rete and
typically has a tubular pattern resembling
Sertoli cell tumour.
ICD-O code 8140/0
Clinical features and histopathology
This is a rare tumour that mostly occurs in
adults. It typically forms polypoid nodules
composed of tubules that project
into the dilated lumen of the rete testis.
The tubules resemble those seen in
benign Sertoli cell tumours.
Adenocarcinoma
Definition
Recommended criteria for the diagnosis
of adenocarcinoma of the rete testis are:
no histologically similar extrascrotal primary,
tumour centred on testicular hilum,
absence of conventional germinal or non
germinal testicular cancer, histologic
transition from unaffected rete testis,
solid growth pattern {1908}.
ICD-O code 8140/3
Epidemiology and clinical features
Rete testis carcinoma is rare, its etiology
unknown. The tumour, predominating in
the fourth through eighth decades, is
usually associated with a scrotal mass,
tenderness, or lumbar pain. It may be
masked by an inguinal hernia, hydrocele,
fistula, sinus or epididymitis. Symptoms
are brief or extend over years. Locally
recurrent tumour nodules and abscesses
may involve the scrotal and perineal skin.
A statistical analysis, based on published
data, was reported {2288}.
Fig. 4.90Adenoma of the rete testis. Note the cysts.
A
Fig. 4.91 Rete testis carcinoma.
Macroscopy
The carcinoma usually forms a non
encapsulated firm, pale rubbery hilar
mass. A cystic component, if any, is usually
minor. Reported lesional size ranges
from 1.0-10.0cm. The boundary between
B
Fig. 4.92 A Sertoliform cystadenoma of the rete testis. B Adenoma of the rete testis. Note the cystic dilatations.
Tumours of collecting ducts and rete
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