Understanding lymphatic terminology
Medical terminology can be confusing—especially when different specialists, medical records, and research articles use different words to describe similar conditions.
This page explains how lymphatic conditions are classified and why terminology has changed over time.
Why are lymphatic conditions called vascular anomalies?
The body has different kinds of vessels:
- Blood vessels
- Lymphatic vessels, which move lymph fluid and support immune function
Together, these make up the vascular system. When these vessels develop differently, doctors use the term vascular anomaly.
Vascular anomalies are grouped into:
- Vascular tumors (abnormal growth of vessel cells)
- Vascular malformations (vessels that formed differently)
Lymphatic malformations belong to the vascular malformation group. They are not tumors and are not cancer.
Types of lymphatic conditions
Isolated lymphatic malformations (Isolated LMs)
Affect one area of the body. They may involve the skin, soft tissue, or a single internal structure. They may be classified as macrocystic, microcystic, or mixed, depending on the size and structure of the cysts.
Complex lymphatic malformations (Complex LMs)
Involve multiple areas of the body or internal systems and may affect bones, organs, or central lymphatic pathways. They are also referred to as complex lymphatic anomalies (CLAs).
Lymphedema
Lymphedema causes chronic swelling due to impaired lymphatic drainage.
Why do different words get used?
Medical language evolves as scientific understanding improves.
You may see older terms such as cystic hygroma or lymphangioma in medical records or articles. These terms were commonly used in the past but are considered less precise based on current scientific understanding.
Today, the most commonly used terms include:
- lymphatic malformation (LM) or isolated lymphatic malformation
- complex lymphatic anomalies (CLA) or complex lymphatic malformation
Different specialists and researchers may prefer different terminology, but these terms generally describe the same group of lymphatic conditions.
What's the difference between “anomaly” and “malformation”?
You may notice that both terms are used in medical records or research.
- Anomaly is a broad term meaning something developed differently. It has traditionally been used to describe complex lymphatic conditions that may involve multiple systems.
- Malformation is more specific and refers to structural differences that occur during development. As scientific understanding has advanced, some researchers have begun using this more precise term in academic literature.
Today:
- “complex lymphatic anomalies (CLAs)” is still the most widely used term in clinical care
- “complex lymphatic malformation” is increasingly being used in some scientific and research settings because it more precisely reflects how these conditions develop.
Both terms refer to the same underlying conditions—the difference reflects how understanding of these conditions continues to evolve.
Why terminology matters
Using clear, consistent language helps:
- Patients understand their diagnosis
- Families know what questions to ask
- Care teams choose appropriate treatments
- Researchers study conditions using shared definitions
It also explains why care may involve specialists from different fields, such as vascular anomalies teams, interventional radiology, genetics, and lymphatic care.
As understanding of lymphatic conditions continues to evolve, the language used to describe them may also change.
While the words may differ, the goal remains the same: helping patients and families access clear information, appropriate care, and the support they need throughout their journey.
