Cryptorchidism is the absence of one or both testes from the scrotum. The word is from the Greek κρυπτός (kryptos), meaning "hidden", and ὄρχις (orchis), ...CryptorchidismFromWikipedia,thefreeencyclopediaJumptonavigationJumptosearchThisarticleneedsadditionalcitationsforverification.Pleasehelpimprovethisarticlebyaddingcitationstoreliablesources.Unsourcedmaterialmaybechallengedandremoved.Findsources: "Cryptorchidism" – news ·newspapers ·books ·scholar ·JSTOR(November2010)(Learnhowandwhentoremovethistemplatemessage)MedicalconditionCryptorchidismCryptorchidismonscrotalultrasoundSpecialtyMedicalgenetics Cryptorchidismistheabsenceofoneorbothtestesfromthescrotum.ThewordisfromtheGreekκρυπτός(kryptos),meaning"hidden",andὄρχις(orchis),meaning"testicle".Itisthemostcommonbirthdefectofthemalegenitaltract.[1]About3%offull-termand30%ofprematureinfantboysarebornwithatleastoneundescendedtestis.However,about80%ofcryptorchidtestesdescendbythefirstyearoflife(themajoritywithinthreemonths),makingthetrueincidenceofcryptorchidismaround1%overall.Cryptorchidismmaydevelopafterinfancy,sometimesaslateasyoungadulthood,butthatisexceptional.Cryptorchidismisdistinctfrommonorchism,theconditionofhavingonlyonetesticle.Thoughtheconditionmayoccurononeorbothsides,itmorecommonlyaffectstherighttestis.[2]Atestisabsentfromthenormalscrotalpositionmaybe:Anywherealongthe"pathofdescent"fromhighintheposterior(retroperitoneal)abdomen,justbelowthekidney,totheinguinalringIntheinguinalcanalEctopic,having"wandered"fromthepathofdescent,usuallyoutsidetheinguinalcanalandsometimesevenundertheskinofthethigh,theperineum,theoppositescrotum,orthefemoralcanalUndeveloped(hypoplastic)orseverelyabnormal(dysgenetic)Missing(alsoseeanorchia).Abouttwo-thirdsofcaseswithoutotherabnormalitiesareunilateral;mostoftheotherthirdinvolvebothtestes.In90%ofcases,anundescendedtestiscanbefeltintheinguinalcanal.Inasmallminorityofcases,missingtestesmaybefoundintheabdomenorappeartobenonexistent(truly"hidden").Undescendedtestesareassociatedwithreduce