An acardius in a monster that sometimes develops in single-ovum twin pregnancies as the result of inequalities in the communicating placental circulation. One twin is well developed and normal, whereas the other is imperfectly formed, with either a rudimentary-hemiacardus or an absent heart-holoacardius. The most common variety of the holoacardian monster is the acephalus, or headless fetus. Authors report a case of acardius acephalus twins associated with hydramnios in a 28 years old , para 1-0-0-1, diagnosed amorphous twins with serial sonograms, terminated in the 23th week prequency and the other in 1 25 years old , para 0-0-0-0, dianosed twins with FDIU in sonogram, We present these two cases with brief review of literatures.