Author: Dr Ben Tallon, Dermatologist/Dermatopathologist, Tauranga, New Zealand, 2012.
Histology of chondrodermatitis nodularis
Scanning power view of chondrodermatitis nodularis helicis shows a wedge-shaped dermal alteration extending through to the superficial cartilage (Figure 1). The epidermis may show a focal zone of orthokeratosis and scalecrust overlying moderate epidermalhyperplasia (Figure 2). Frequently there will be superficial epidermalulceration. There is a zone of eosinophilic fibrinoid material overlying the affected area of cartilage, with the blurring of the superficial cartilage and altered staining (Figure 3). There may be adjacent perichondrial thickening.