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Microscopic polyangiitis (MPA) is a condition that causes small blood vessels to be inflamed. It's a rare type of vasculitis. The disease can damage the blood vessels and cause problems in organs around the body. Read on to learn about causes, symptoms, diagnosis, and treatment.

Mitral valve regurgitation is when the mitral valve in the heart is leaky. Read on to learn details about this condition, including causes, risk factors, symptoms, diagnosis, and treatment.

Neurogenic bowel is the loss of normal bowel function. It’s caused by a nerve problem. Here's what you need to know about this condition.

Neuronal and mixed neuronal-glial tumors are a group of rare tumors that occur in the brain or spinal cord.

An ovarian cyst is a fluid-filled sac that forms on or inside an ovary. Read on to learn about the causes and types of ovarian cysts, risk factors, symptoms, diagnosis, and treatment.

In parotid duct obstruction, part of your parotid duct becomes blocked. As a result, saliva can't flow normally from your parotid gland into your mouth.

Pelvic congestion syndrome is a condition that causes chronic pelvic pain. It is thought to be caused by problems with the veins in the pelvic area. This is the lower part of your abdomen.

Pericardial effusion is the buildup of extra fluid in the space around the heart. If too much fluid builds up, it can put pressure on the heart. This can prevent it from pumping normally.

Polymyalgia rheumatica (PMR) is an inflammatory condition that can cause aching and stiffness. It tends to affect the neck, shoulders, and hips. The aching and stiffness are usually worse in the morning.