The Correct Answer is D: Involvement of the Upper Respiratory Tract
Upper respiratory tract involvement does NOT characterize polyarteritis nodosa (PAN) and is instead a hallmark feature of granulomatosis with polyangiitis (formerly Wegener's granulomatosis), which helps distinguish these two vasculitides. 1
Why Each Answer is Correct or Incorrect:
Option D (Correct Answer - NOT a feature of PAN):
Upper respiratory tract involvement is characteristically absent in PAN. The 2021 ACR/Vasculitis Foundation guideline explicitly notes that PAN affects medium-sized vessels and presents with neurologic, cutaneous, renal, and gastrointestinal manifestations, but respiratory tract involvement is not part of the disease spectrum 1. This is a critical distinguishing feature from other vasculitides like granulomatosis with polyangiitis.
Option A (Incorrect - IS a feature of PAN):
Formation of multiple microaneurysms is a classic and diagnostic feature of PAN, with angiography revealing saccular or fusiform aneurysms in mesenteric, hepatic, and renal arteries 1, 2.
Option B (Incorrect - IS a feature of PAN):
Association with hepatitis B infection is well-established in PAN, though the incidence has declined from approximately 30% to about 7% due to blood product screening and vaccination programs 3, 4.
Option C (Incorrect - IS a feature of PAN):
Livedo reticularis is one of the common cutaneous manifestations of PAN, along with nodules, and is specifically mentioned in the 2021 ACR guideline as a typical clinical presentation 1, 2.
Option E (Incorrect - IS a feature of PAN):
Presence of arterial microaneurysms is essentially the same as option A and represents a pathognomonic finding on angiography that aids in establishing the diagnosis of PAN 1.