A seminal cyst, also known as a seminal vesicle cyst or a seminal gland cyst, refers to a fluid-filled sac that forms in the seminal vesicles. These cysts can vary in size and may be acquired or congenital in nature. Although they are typically benign and asymptomatic, they can occasionally cause discomfort or urinary issues. Since their discovery in the late 19th century, medical professionals have developed various synonyms for seminal cysts, including seminal vesicle dilation, seminal sac cysts, and seminal duct cysts. These terms are used interchangeably to describe the same condition, allowing healthcare providers to effectively communicate and diagnose this relatively uncommon occurrence.