Dipygus: Computed tomography findings and management.

Complete dipygus is a very rare congenital malformation involving complete lumbosacral duplication with two pelves and four lower limbs [1]. Several incomplete forms have been reported. Pygomelia is an incomplete form in which two of the lower limbs fusion (symmelia) form a single supernumerary middle limb inserting into the pelvis [2—5]. Pygomelia has often been described as caudal or lumbosacral duplication with a supernumerary limb [6—11]. Other reports have described even less complete forms with no accessory limbs, the only evidence of dipygus being a duplication of external genitalia and the anal orifice [6—9]. Due to the rareness of this condition, very few cases have been described in the literature [2—13], particularly in Africa where only three cases have been reported up to now [1—3]. Furthermore, the use of the terms dipygus, pygomelia and caudal duplication is not always clear in African literature and there has been some confusion [2—13]. We report here the imaging findings of a case of incomplete dipygus using multidetector row computed tomography (MDCT), and discuss the issues related to its management.