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[Genitourinary [GU]] 78 /M, Slowly growing right testicle (from 5 yrs ago) Myoung Seok Lee 2021-03-05
Subspecialty	Genitourinary [GU]
Classification	Tumor
Difficulty	Rare case
Modality	US, CT
A large low echoic mass in Rt scrotum and non-visualization of normal Rt testis No internal blood flow even on power doppler image Homogeneous low attenuated non-enhancing Rt testicular mass on CT
Questions	What is your diagnosis Go to answer

ANSWER
[Genitourinary [GU]] 78 /M, Slowly growing right testicle (from 5 yrs ago)
Questions	What is your diagnosis
Diagnosis	Epidermoid cyst
Answer
Comments	Difficult to diagnose due to the lack of a characteristic \"onion-skin\" shape and non-visible normal testicle.
Filled with brown and grey-white sebaceous material. Deviated normal testicle without evidence of invasion.
References	World J Mens Health. 2015 Aug; 33(2): 117?120.
Keywords	Testis, Tumor, Epidermoid cyst