Tunica vaginalis cyst is a type of benign paratesticular cystic lesion. This arises in associated to the tunica vaginalis. It is a cyst that arises from the tunica and, in conjunction with tunica albuginea cysts, they are collectively termed scrotal tunica cysts.
Their exact cause is unknown, although history of trauma, haemorrhage and/or infection may be present.
On microscopic analysis, they are lined by nonciliated cuboidal cells, and they contain serous fluid and cellular debris.
They are typically seen as a small (2-5 mm) anechoic uni-or multilocular cystic lesion within the layers of the tunica vaginalis. Larger cysts can cause compression the testicular parenchyma and simulate an intratesticular lesion. Some cysts may have low-level echoes and/or calcification.
For ultrasound appearances consider
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