Levamisole-Adulterated Cocaine-Induced Thrombotic Vasculopathy With Negative Serology.

Substance abuse is an important public health issue in the United States. The prevalence of cocaine use is wide, and it is noted to be adulterated with a substance called levamisole, which can increase the bulk and possibly potentiate cocaine's euphoric effect. Literature shows that levamisole-induced vasculopathy has a strong association with antineutrophil cytoplasmic antibodies (ANCA) antibodies. However, we report a case of biopsy-confirmed levamisole-related thrombotic vasculopathy with negative perinuclear antineutrophil cytoplasmic antibody (p-ANCA) and cytoplasmic antineutrophil cytoplasmic autoantibody (c-ANCA) antibodies. Our case highlights the serious consequences of substance abuse. Here, we provide educational value and encourage physicians to keep the differentials broad when encountering a dermatological case in patients with cocaine use and highlight the importance of skin biopsy for the diagnosis and appropriate management.