<prompt> 3 year old child with red scrotal swelling which shows self resolution by next day morning and maximum in evening with positive transillumination test. Diagnosis:Scrotal abscessCongenital hydroceleSecondary abscessInfantile hydrocele  <response>: Ans. b Congenital hydroceleRef: Bailey Love 26th ed. 1382 Hydrocele is an accumulation of fluid in layers of tunica vaginalis. Vaginal hydrocele: MC type. Accumulation of fluid within tunica vaginalis layers Infantile hydrocele: doesnt necessarily appear in infants. The tunica and processus vaginalis are distended to the inguinal ring without any connection with peritoneal cavity. Congenital hydrocele: It is due to patent processus vaginalis which allows peritoneal fluid to move freely. Size of hydrocele fluctuates usually related to activity Treatment: herniotomy 