Lymphology Association of North America (LANA) Practice Exam

Primary lymphedemas are classified as conditions that arise due to congenital or hereditary factors, leading to an inadequate lymphatic system. Among the conditions listed, Meige's disease, Milroy's disease, and congenital lymphedema all fall under this classification.

Meige's disease, also known as lymphedema praecox, typically manifests during puberty or adolescence and is often hereditary, leading to lymphatic dysfunction. Milroy's disease is a more severe and early-onset hereditary form of primary lymphedema, characterized by edema of the extremities due to lymphatic malformations. Congenital lymphedema refers to lymphatic insufficiency present at birth, which can also be inherited.

Since all these conditions are recognized forms of primary lymphedemas, the option indicating that all are true accurately encapsulates the essence of primary lymphedema types. Thus, it reflects a comprehensive understanding of the various hereditary and congenital factors contributing to lymphatic disorders.