platypelloid pelvis /plat′əpel″oid/ [Gk, platys, broad, pella, bowl, eidos, form; L, pelvis, basin] , a rare type of pelvis in which the inlet is round like the gynecoid type in the anterior section, but the posterior section is foreshortened by its flat and heavy border. The sacrum is hollow and inclines posteriorly, and the sidewalls are convergent. In the midplane the transverse diameter is much wider than the narrowed anteroposterior diameter. Vaginal delivery is not usually possible in the 3% of women who have platypelloid pelves.
