Search Results for: cysts

Differential Diagnosis in Dermatopathology

Acne vulgaris, erythematous papule vs. Rosacea, erythematous papule

…aceous units, especially infundibula, that may manifest itself solely as noninflammatory lesions, i.e., comedones and intact cysts, or as inflammatory lesions, i.e., papules, nodules, and pustules. The process may resolve without residua or with…

Pigmented tumor in the nostril

Pigmented tumor in the nostril

…tosis of the epidermis. In addition, we note a broad fingerlike downward epithelial proliferation containing occasional horn cysts, which consists of two cell types, basal cells located in the periphery and malpighian cells in the center. These…

Histologic Diagnosis of Inflammatory Skin Diseases

Applicable Terms

…blistering diseases, e.g., porphyria cutanea tarda and bullous pemphigoid. Most milia, however, represent tiny infundibular cysts. Columns of parakeratosis known as cornoid lamellae emanate at times from infundibula of several “types”…

Histologic Diagnosis of Inflammatory Skin Diseases

Acne vulgaris

…a that are similar to comedones, but whose “walls” have become bowed with formation thereby of tiny infundibular cysts. When infundibular cysts become larger, they tend to explode, releasing into the dermis the contents of them, to wit,…

Histologic Diagnosis of Inflammatory Skin Diseases

Subcutaneous Fat: Panniculitis

…ipocytes and replacement of them by fine granules of amphophilic staining extracellular lipid) (Fig. 5.401A) Fat “microcysts” (spaces, which are not true cysts because they are not lined by epithelium, of various sizes that mark the site…

Differential Diagnosis in Dermatopathology

Differential Diagnosis

…l dermis 10. Cornification of neoplastic trichoblasts (i.e., “cysts” that contain corneocytes) common 10. “Cysts” that contain corneocytes uncommon 11. Foreign-body granulomas common around cornified cells from ruptured…

Histologic Diagnosis of Inflammatory Skin Diseases

Rosacea

…nced predilection for the vicinity immediate of infundibular epidermis. The nodular form of rosacea consists of infundibular cysts that rupture with subsequent suppuration, granulomatous inflammation, and extensive fibrosis, in that sequence, and of…