Differential Diagnosis for Left Epididymal Cyst
Single Most Likely Diagnosis
- Epididymal cyst (also known as spermatocele): This is the most likely diagnosis given the location and description of the cyst. Epididymal cysts are benign, fluid-filled structures that are commonly found on the head of the epididymis but can also occur on the lower aspect.
Other Likely Diagnoses
- Hydrocele: A hydrocele is an accumulation of serous fluid in a body cavity, in this case, surrounding the testis. It could be considered if the cyst is large enough to surround the testis or if it's communicating with the testicular tunics.
- Varicocele: Although typically presenting with a "bag of worms" feeling due to dilated veins, a varicocele could be considered if the cystic structure is actually a cluster of dilated veins.
- Epididymitis: Inflammation of the epididymis could present with swelling, but it's usually accompanied by pain and other symptoms of infection.
Do Not Miss Diagnoses
- Testicular tumor: Although less likely, any testicular or epididymal mass could potentially be a tumor. It's crucial to rule out testicular cancer, which can present as a painless mass.
- Epididymal abscess: An abscess in the epididymis could present similarly to a cyst but would typically be accompanied by signs of infection such as pain, redness, and warmth.
Rare Diagnoses
- Adrenal rest tumor: These are rare, benign tumors that can occur in the testes or near the epididymis in individuals with congenital adrenal hyperplasia.
- Mesothelioma of the tunica vaginalis: A rare form of cancer that affects the lining surrounding the testes.
- Cystic teratoma or dermoid cyst of the testis: Although more commonly found within the testis, these rare tumors could potentially be mistaken for an epididymal cyst if they are located near the epididymis.