Bilateral lower limb edema can be due to several systemic conditions. Which of the following is a plausible systemic cause?

Bilateral lower limb edema can be due to several systemic conditions. Which of the following is a plausible systemic cause?

• A. Hepatic failure
• B. Allergic contact dermatitis
• C. Acute deep vein thrombosis in both legs
• D. Localized venous insufficiency

Answer: (A)

Bilateral leg edema points to a systemic disruption of fluid balance rather than a local venous issue. In hepatic failure, the liver’s ability to produce albumin drops. Albumin helps keep fluid in the bloodstream; when its level falls, fluid leaks into the interstitial spaces, producing edema. This hypoalbuminemia–driven fluid shift often produces edema in both legs and can be accompanied by other signs of liver disease such as ascites and overall fluid retention, reinforcing the systemic nature of the problem. The other options don’t fit the pattern of bilateral, systemic edema. Allergic contact dermatitis is a localized skin reaction and wouldn’t explain symmetric leg swelling. Acute deep vein thrombosis usually causes sudden unilateral leg swelling from a blocked vein, not bilateral involvement. Localized venous insufficiency tends to cause edema in specific regions and is not a systemic process.

Bilateral leg edema points to a systemic disruption of fluid balance rather than a local venous issue. In hepatic failure, the liver’s ability to produce albumin drops. Albumin helps keep fluid in the bloodstream; when its level falls, fluid leaks into the interstitial spaces, producing edema. This hypoalbuminemia–driven fluid shift often produces edema in both legs and can be accompanied by other signs of liver disease such as ascites and overall fluid retention, reinforcing the systemic nature of the problem.

The other options don’t fit the pattern of bilateral, systemic edema. Allergic contact dermatitis is a localized skin reaction and wouldn’t explain symmetric leg swelling. Acute deep vein thrombosis usually causes sudden unilateral leg swelling from a blocked vein, not bilateral involvement. Localized venous insufficiency tends to cause edema in specific regions and is not a systemic process.