In polyarteritis nodosa, which organ system is typically spared from involvement?

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Prepare for the Rosh Internal Medicine Exam with quizzes, flashcards, and multiple-choice questions, complete with hints and explanations. Get ready to excel on your exam!

Multiple Choice

In polyarteritis nodosa, which organ system is typically spared from involvement?

Explanation:
Polyarteritis nodosa is a necrotizing vasculitis of medium-sized arteries. It classically targets vessels such as those supplying the kidneys, mesentery, skin, and nerves, leading to hypertension, abdominal pain, livedo or nodules, and neuropathies. The lungs are typically spared because the disease’s inflammatory pattern favors medium-sized arteries and does not usually involve the pulmonary vasculature; when the lungs are involved, it’s more characteristic of small-vessel ANCA-associated vasculitides like granulomatosis with polyangiitis. So the organ system commonly spared is the lungs.

Polyarteritis nodosa is a necrotizing vasculitis of medium-sized arteries. It classically targets vessels such as those supplying the kidneys, mesentery, skin, and nerves, leading to hypertension, abdominal pain, livedo or nodules, and neuropathies. The lungs are typically spared because the disease’s inflammatory pattern favors medium-sized arteries and does not usually involve the pulmonary vasculature; when the lungs are involved, it’s more characteristic of small-vessel ANCA-associated vasculitides like granulomatosis with polyangiitis. So the organ system commonly spared is the lungs.

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