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Ptosis (from the Greek word πτῶσις "falling", "a fall", "dropped") refers to droopiness of a body part. Specifically, it can refer to:
- Ptosis (eyelid) (the most common usage of the term), a drooping of the upper or lower eyelid
- Ptosis (breasts), refers to drooping or sagging of the breast. Breast ptosis is related to the laxity of the superficial fascia, suspensory ligaments and skin
- Gastroptosis (stomach), the abnormal downward displacement of the stomach. It is not a life-threatening condition. The condition frequently causes digestive symptoms and constipation, and is much more prominent in women than men
- Nephroptosis or renal ptosis (kidney)
- Visceroptosis (internal organs), a prolapse or a sinking of the abdominal viscera (internal organs) below their natural position
- Prolapse, literally means "to fall out of place", from the Latin prolabi meaning "to fall out"
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