This inflammation is typically caused by the<unk>  being caught on the femur, or pinched between the femur and the patella. The most common location of<unk>  tissue is along the medial (inside) side of the knee. The<unk>  can tether the patella to the femur, be located between the femur and patella, or be located along the femoral condyle. If the<unk>  tethers the patella to the femoral condyle, the symptoms may cause it to be mistaken for chondromalacia. The<unk>  themselves are remnants of the fetal stage of development where the knee is divided into three compartments. The<unk>  normally diminish in size during the second trimester of fetal development, as the three compartments develop into the synovial capsule. In adults, they normally exist as sleeves of tissue called synovial folds. The<unk>  are usually harmless and unobtrusive;<unk>  only occurs when the synovial capsule becomes irritated, which thickens the<unk>  themselves (making them prone to irritation/inflammation, or being caught on the femur).
Plica syndrome
Gradenigo's syndrome
Hereditary angioedema
Reynolds syndrome
Roemheld syndrome
Swyer–James syndrome
Oral allergy syndrome
Larsen syndrome