Dermatology Practical & Conceptual

Enlarging plaque on the face with enlarged supraorbital nerve

Case report A 38-year-old Nigerian man, who had been living in Italy since 2008, presented with an annular lesion on the right temporal and frontal region that appeared two months prior to his visit. He reported a slow centrifugal enlargement of the…

Histologic Diagnosis of Inflammatory Skin Diseases

Images

Images 10.71.1A: Vasculitis, large-vessel, and panniculitis, lobular mostly + 10.71.1B: Suppurative arteritis = Nodular vasculitis, early ┬áThe only condition characterized by suppurative arteritis and extensive panniculitis is nodular vas…

Differential Diagnosis in Dermatopathology

Discussions

Erythema nodosum and nodular vasculitis are stereotypes of septal and lobular panniculitis, respectively. When developed fully, erythema nodosum is a granulomatous and fibrosing septal panniculitis and nodular vasculitis is a necrotizing, suppurativ…

Differential Diagnosis in Dermatopathology

Discussions

Nodular vasculitis and subcutaneous polyarteritis nodosa are inflammatory diseases that affect medium-sized and large arteries situated in fibrous septa of the subcutaneous fat. Both conditions involve the subcutaneous fat mostly, although signs of…

Histologic Diagnosis of Inflammatory Skin Diseases

Crohn’s disease

Crohn’s disease Synonyms Inflammatory bowel disease Regional ileitis Regional enteritis Chronic cicatrizing enteritis Presentation stereotypical Age and sex Young adults; slight predominance of women Distribution of lesions The poles of the ga…

Differential Diagnosis in Dermatopathology

Erythema nodosum vs. Nodular vasculitis

An inflammatory disease caused by the spirochete Borrelia burgdorferi that manifests itself in the skin as erythematous lesions with figurate shapes, e.g., (round, ellipsoid, and arcuate) (erythema chronicum migrans), pseudolymphomatous nodules (lym…

Histologic Diagnosis of Inflammatory Skin Diseases

Erythema nodosum

Erythema nodosum Synonyms Erythema contusiforme Erythema contusiformis Dermatitis contusiformis Erythema nouesux Presentation stereotypical Age and sex Young adults, especially women Distribution of lesions Bilateral and symmetrical over the pretibi…

Differential Diagnosis in Dermatopathology

Nodular vasculitis vs. Subcutaneous polyarteritis nodosa

An inflammatory disease caused by the spirochete Borrelia burgdorferi that manifests itself in the skin as erythematous lesions with figurate shapes, e.g., (round, ellipsoid, and arcuate) (erythema chronicum migrans), pseudolymphomatous nodules (lym…