Waterhouse-Friderichsen syndrome is most accurately described as?

• A. Chronic adrenal autoimmune destruction
• B. Acute adrenal hemorrhage with adrenal insufficiency due to septicemia
• C. Pheochromocytoma with hemorrhage
• D. Adrenal hyperplasia due to ACTH excess

Answer: (B)

Waterhouse-Friderichsen syndrome is an acute adrenal crisis caused by bilateral adrenal hemorrhage in the setting of septicemia (often meningococcemia). The sepsis triggers disseminated intravascular coagulation, leading to bleeding into both adrenal glands. The resulting sudden adrenal insufficiency causes refractory hypotension and shock, frequently with fever and a purpuric rash. This describes an acute, hemorrhagic adrenal failure driven by infection, rather than a chronic autoimmune process, a pheochromocytoma-related issue, or ACTH-driven adrenal hyperplasia.

Autoimmune destruction causes a gradual, chronic adrenal insufficiency (Addison disease) rather than an acute hemorrhagic crisis. Pheochromocytoma with hemorrhage would present with symptoms related to catecholamine excess and mass effects, not primarily septic shock from adrenal failure. Adrenal hyperplasia from ACTH excess underlies Cushing-type states, not acute hemorrhagic adrenal insufficiency.