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