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The placenta is a large organ that develops in the uterus during pregnancy and is connected to the fetus by the umbilical cord

A pneumothorax (collapsed lung) is a buildup of air in the space between the lung and the chest wall. This pressure keeps the lung

Some medical tests report results in picograms (pg). A picogram is one-trillionth of a gram. A gram is about 1/30 of an ounce.

The pituitary gland is a small gland located beneath the brain. The pituitary gland produces substances (hormones) that enter the

A replacement heart valve is made of plastic, metal, or animal tissue and is implanted to replace a person's original heart valve

Pinworms are a type of parasite that lives in the digestive system of humans. Most people get infected by touching something that

A pimple is an inflamed bump on the skin. It's caused when a skin pore gets clogged with oil and dead skin cells. Bacteria can

A pilonidal cyst may look like a small hole or dimple under the skin at the top of the crease of the buttocks. Pilonidal cysts

Some medical tests report results in picomoles per liter (pmol/L). A mole is an amount of a substance that contains a large number

Some medical tests report results in picograms per milliliter (pg/mL). A picogram is one-trillionth of a gram. A gram is about 1