Tophi – Uric Acid Crystal Deposits in Gout
Tophi (singular: tophus) are hard deposits of uric acid crystals that form in tissues as a result of chronic gout, commonly affecting joints, tendons, and skin.
Wissenswertes über "Tophi"
Tophi (singular: tophus) are hard deposits of uric acid crystals that form in tissues as a result of chronic gout, commonly affecting joints, tendons, and skin.
What Are Tophi?
Tophi (singular: tophus) are firm, nodular deposits composed of monosodium urate crystals that accumulate in soft tissues when uric acid levels in the blood remain persistently elevated. They are a hallmark of chronic tophaceous gout and indicate long-standing, poorly managed hyperuricemia. Tophi can develop around joints, in tendons, under the skin, and in other tissues throughout the body.
Causes
Tophi form as a result of chronic hyperuricemia (elevated uric acid in the blood), which leads to the precipitation of monosodium urate crystals in tissues. Risk factors include:
- Persistently elevated serum uric acid levels (above 6.8 mg/dL)
- Untreated or poorly controlled gout over many years
- Diet high in purines (e.g., organ meats, shellfish, legumes)
- Chronic kidney disease with reduced uric acid excretion
- Excessive alcohol consumption, especially beer
- Certain medications (e.g., diuretics, cyclosporine)
- Genetic predisposition
Symptoms and Locations
Tophi are generally painless but may become tender and inflamed during acute gout flares. They grow slowly and can range in size from a small pea to a golf ball. Common locations include:
- Ear cartilage (helix)
- Finger and toe joints
- Elbow (olecranon bursa)
- Heel and Achilles tendon
- Knee joint
- Back of the foot
Large or inflamed tophi can cause joint damage, limited range of motion, and in rare cases, skin ulceration when crystals break through the skin surface.
Diagnosis
Tophi are often diagnosed clinically through visual inspection and palpation. Additional diagnostic tools include:
- Blood tests: Serum uric acid measurement
- Imaging: X-rays may show calcified deposits; ultrasound and dual-energy CT (DECT) provide more detailed visualization of urate crystal deposits
- Aspiration and microscopy: Needle-shaped monosodium urate crystals identified under polarized light microscopy (gold standard)
- Synovial fluid analysis: When joints are involved
Treatment
The primary goal of treatment is to lower serum uric acid levels to promote the gradual dissolution of existing tophi and prevent new deposits from forming.
Pharmacological Treatment
- Xanthine oxidase inhibitors: Allopurinol and febuxostat are the first-line agents for reducing uric acid production.
- Uricosuric agents: Probenecid enhances renal excretion of uric acid.
- Pegloticase: An enzymatic therapy used in severe, refractory cases to rapidly lower uric acid levels.
- Anti-inflammatory therapy: NSAIDs, colchicine, or corticosteroids are used to manage acute flares.
Surgical Treatment
Surgical removal of tophi may be considered in rare cases where the deposits cause significant mechanical impairment, nerve compression, or non-healing skin wounds.
Diet and Lifestyle
- Reduce intake of purine-rich foods
- Maintain adequate hydration (at least 2 liters of fluid per day)
- Avoid alcohol, especially beer and spirits
- Achieve and maintain a healthy body weight
References
- Richette P, Doherty M et al. - 2016 updated EULAR evidence-based recommendations for the management of gout. Annals of the Rheumatic Diseases, 2017;76(1):29-42.
- FitzGerald JD et al. - 2020 American College of Rheumatology Guideline for the Management of Gout. Arthritis Care and Research, 2020;72(6):744-760.
- Terkeltaub R. - Gout and other crystal arthropathies. In: Harrison's Principles of Internal Medicine, 20th edition, McGraw-Hill, 2018.
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