Milroys Disease, also known as primary lymphedema type II, is a rare genetic disorder that affects the lymphatic system. It is named after the physician William Milroy, who first described the condition in 1892. This disease is characterized by impaired lymphatic drainage, leading to the accumulation of fluid in the limbs, usually the legs. Though the term "Milroys Disease" is mostly used by medical professionals, it is important to note that it is synonymous with primary lymphedema type II. Other synonyms for this condition include Milroy's Syndrome, Milroy Disease, Familial Lymphedema, and Hereditary Lymphedema. While the name may vary, these terms all refer to the same disorder that causes chronic swelling and can lead to various complications if left untreated.