An exophytic kidney cyst is a ball-shaped mass located in the kidney that grows and compresses the area around it, according to the University of Virginia School of Medicine. This type of cyst is different from an infilt... More »

Kidney Cancer Institute explains simple kidney cysts do not pose a cancer risk to patients, whereas complex kidney cysts have different characteristics that may make them cancerous. A simple kidney cyst is spherical, is ... More » Health Conditions & Diseases

Treatment options for kidney cysts usually include puncturing and draining the cyst, at which point it may be filled with alcohol, states Mayo Clinic. Surgery may also be used to remove the cyst. However, if the cyst is ... More »

Reactive lymphoid hyperplasia, or reactive lymphadenopathy as it is sometimes referred to, is an enlargement of the lymphoid tissue due to stimulation by antigens, according to the University of Virginia School of Medici... More »

An arachnoid cyst is a type of brain cyst that forms due to the splitting of the arachnoid membrane, according to Johns Hopkins Medicine. It is a fluid-filled sac that appears in the tissues covering the central nervous ... More » Health Conditions & Diseases

A colloid cyst is a mass that occurs within the brain that prevents the fluid in the brain from flowing through the ventricles, according to UCLA. Most often, patients have headaches before they have any other symptoms. More » Health Conditions & Diseases

A popliteal cyst, also called a Baker's cyst, is an accumulation of synovial fluid in the back of the knee in an area called the popliteal bursa, according to Mayo Clinic. It can form as a result of joint inflammation, k... More »