Pulmonary interstitial emphysema (PIE) is when air gets trapped in the tissue outside the tubes and air sacs of the lungs. It affects newborn babies.

Post-thrombotic syndrome (PTS) is a condition caused by damage to veins from a blood clot. PTS can cause chronic pain, swelling, and other symptoms in your leg. It may develop in the weeks or months after a deep vein thrombosis (DVT) of the leg.

Posterior tibialis tendon surgery is a way to fix the tendon on the back of your calf that goes down the inside part of your ankle.

Pneumatic retinopexy is a procedure to correct a detached retina. It helps to bring back vision. It uses a special tool to fix the retina and a small bubble of gas to hold the retina in place so it can heal.

Photodynamic therapy for the eyes uses lasers and a special medicine that works when exposed to a type of light. It is done to treat age-related macular degeneration (AMD).

Supraventricular tachycardia (SVT) is a type of abnormally fast heartbeat. The heart normally beats 60 to 100 beats per minute. With SVT, the heart beats more than 100 times a minute. It may beat as fast as 250 times a minute.

A pterygium is a type of growth on the eye that is not cancer. Often, it is only a minor problem unless it causes changes in your eyesight. Pterygia (the plural form of the word) are common in people who are exposed to ultraviolet (UV) rays for long periods of time.

Thoracic outlet syndrome is a set of symptoms in the shoulder, arm, or hand. It occurs from a narrowing of the thoracic outlet. This is the space between your collarbone and your first rib.

Primary ovarian insufficiency (POI) is when the ovaries stop working normally before the age of 40. An ovary does not release an egg each month as it should. This can cause symptoms and make it hard to get pregnant.

Premature ventricular contractions (PVCs) are a type of abnormal heartbeat (arrhythmia). They are very common. They can occur in people of all ages from time to time. They usually cause only mild symptoms.