Ptosis (from the Greek: πτῶσις 'falling', 'a fall', 'dropped') refers to droopiness or abnormal downward displacement of a body part or organ. Particular cases include: Ptosis (eyelid) Ptosis (chin) Ptosis (breasts) Visceroptosis, of the abdominal viscera Gastroptosis, of the stomach Nephroptosis, of the kidney See also Prolapse, a condition in which organs fall down or slip out of place Proptosis, or Exophthalmos