Search Results for: suppuration

Differential Diagnosis in Dermatopathology

Nodular vasculitis vs. Subcutaneous polyarteritis nodosa

A disease of pilosebaceous units, especially infundibula, that may manifest itself as noninflammatory lesions, i.e., comedones and intact cysts, or as inflammatory lesions, i.e., papules, nodules, and pustules. The process may resolve without…

Differential Diagnosis in Dermatopathology

Tuberculoid leprosy vs. Sarcoidosis

A disease of pilosebaceous units, especially infundibula, that may manifest itself as noninflammatory lesions, i.e., comedones and intact cysts, or as inflammatory lesions, i.e., papules, nodules, and pustules. The process may resolve without…

Histologic Diagnosis of Inflammatory Skin Diseases

Tuberculosis

…defenseless in the face of proliferation of tubercle bacilli and of the effects of them. Extensive necrosis (caseation) and suppuration result. Concurrent with these events, the bacilli enter lymphatics and travel to lymph nodes in the region,…

Histologic Diagnosis of Inflammatory Skin Diseases

Polyarteritis nodosa

…lly, is seen at scanning magnification to involve the panniculus adiposus extensively in the form of necrosis of adipocytes, suppuration, granulomatous inflammation, and fibrosis. Rarely, polyarteritis nodosa is accompanied by formidable…

Histologic Diagnosis of Inflammatory Skin Diseases

Erythema nodosum

…filtrate of neutrophils mostly around venules and in the interstitium of fibrous septa in the subcutaneous fat; tiny foci of suppuration in septa exceptionally Neutrophils scattered at the periphery of fat lobules, sometimes in conjunction with…

Differential Diagnosis in Dermatopathology

Differential Diagnosis

…ses in the dermis sometimes 6. Granulomas in conjunction with suppurative inflammation 6. Granulomas often in the absence of suppuration 7. No necrosis in association with granulomas 7. Caseous necrosis sometimes in the center of granulomas 8. Few,…

Differential Diagnosis in Dermatopathology

Discussions

…is, nodular vasculitis is associated with extensive lobular panniculitis that demonstrates every aspect of inflammation from suppuration through granulomas to fibrosis. The artery in nodular vasculitis displays extensive necrosis of smooth muscle…