i-Micropenis kuwumthondo omuncane,umbandela evamile iyi amaphiko(kulinganiswa phezulu) uqonde penile obuphelele okungenani 2.5 ngeziphambeko ejwayelekile lincane kusho ubukhulu womuntu umthondo, noma umncane kakhulu kunalokho mayelana  yomuntu omdala uma kuqhathaniswa nokwakhiwa okumaphakathi kwe- 12.5 centimetres (5 in) . Isimo sivame ukuqashelwa ngemuva nje kokuzalwa.Leli gama livame ukusetshenziswa kwezokwelapha lapho lonke ipipi, i- scrotum, ne- perineum zingenakho ukungacaci, njenge- hypospadias .I-Micropenis yenzeka cishe ku-0.6% wabesilisa. Ezimweni ezingajwayelekile ezihlotshaniswa ne-micropenis, iningi lezimo zokuncishiswa kokukhiqizwa kokubeletha kwe-androgen noma umphumela, njengokuthuthuka okungavamile kwamasende (i-testicular dysgenesis), i- Klinefelter syndrome, i- Leydig cell hypoplasia, amaphutha athile we- testosterone noma i-dihydrotestosterone synthesis ( 17,20-lyase defence, 5α-reductase defence ), androgen insensitivity syndromes, insider pituitary stimulation ( gonadotropin defence), nezinye izinhlobo ze- hypogonadism yokuzalwa. I-Micropenis nayo ingenzeka njengengxenye yama-syndromes amaningi we-malformation symromes angafaki ama-chromosomes ocansi. Kwesinye isikhathi kuyisibonakaliso sokuntuleka kokukhula kwama-hormone noma i-congenital hypopituitarism .Izakhi zofuzo eziningana ze- homeobox zithinta usayizi wepipi nowedijithi ngaphandle kokungajwayelekile kwe-hormone.