"Congenital hydrocele is of a cylindrical shape; and this is mentioned as distinguishing it from isolated hydrocele of the tunica vaginalis, which is pyriform; but this mark will fail when the cord is at the same time distended, as it may be, in the latter form of the complaint."
"The most common form is the ordinary vaginal hydrocele, in which the fluid is contained in the sac of the tunica vaginalis, which is separated, in its normal condition, from the peritoneal cavity by the whole extent of the inguinal canal."
"Techniques used include culture from a wide variety of specimens, special stains, direct antigen detection (Group A streptococci, Cryptosporidium, Giardia lamblia, Trichomonas vaginalis), molecular real-time PCR diagnostics, and toxin assays (Clostridium difficile and enterohemorrhagic E. coli)."