Hydrocele typically does not cause pain, though discomfort or pain can occur depending on the extent of swelling. A spermatic cord cyst, also known as a cord hydrocele, forms when intra-abdominal pressure pushes fluid from the abdominal cavity through an opening, where it collects in the remnants of the processus vaginalis. A key diagnostic finding is a palpable mass in the inguinal canal during physical examination, which appears on ultrasonography as a fluid-filled sac enclosed by a membrane. The most common symptom is a noticeable swelling in the scrotum. In infants, these cysts usually grow slowly and painlessly, but can sometimes lead to rapid irritability. Discomfort may arise from the cyst's weight, and infants may experience pain if the fluid within the cyst becomes infected.