Dermatologic Manifestations of Lymphedema Workup
- Author: Kathleen M Rossy, MD; Chief Editor: William D James, MD more...
Laboratory Studies
Analysis of blood, urine, or tissue is not needed to make the diagnosis of lymphedema. Such tests, however, help to define the underlying causes of lower extremity edema when the etiology is unclear.
Liver function, BUN/creatinine levels, and urinalysis results should be checked if a renal or hepatic etiology is suspected. Specific markers should be checked if a neoplasm is suspected. CBC count with differential should be checked if an infectious etiology is being considered.
Imaging Studies
Imaging is not necessary to make the diagnosis, but it can be used to confirm it, to assess the extent of involvement, and to determine therapeutic intervention.
Lymphangiography is an invasive technique that can be used to evaluate the lymphatic system and its patency. Although it was once thought to be the first-line imaging modality for lymphedema, it is now rarely used because of the potential adverse effects.
Lymphoscintigraphy is the new criterion standard to assess the lymphatic system. It allows for detailed visualization of the lymphatic channels with minimal risk. The anatomy and the obstructed areas of lymphatic flow can be assessed.
Ultrasonography can be used to evaluate the lymphatic and venous systems. Volumetric and structural changes are identified within the lymphatic system. Venous abnormalities such as deep vein thrombosis can be excluded based on ultrasonography findings.
MRI and CT scanning can also be used to evaluate lymphedema. These radiologic tests can be helpful in confirming the diagnosis and monitoring the effects of treatment. They are also recommended when malignancy is suspected.
Other Tests
A biopsy should be performed if the diagnosis is not clinically apparent, if areas of chronic lymphedema look suspicious, or if areas of chronic ulceration exist.
Histologic Findings
Histologic findings include hyperkeratosis with areas of parakeratosis, acanthosis, and diffuse dermal edema with dilated lymphatic spaces. In chronic lymphedema, marked fibrosis and scattered foci of inflammatory infiltrate can be seen.
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