Search Results for: actinic squamous-cell

Differential Diagnosis in Dermatopathology

Seborrheic keratosis, acanthotic type vs. Eccrine poroma

An inflammatory process that results from either topical or systemic sensitization coupled with the effects of ultraviolet light. The lesions, all of which occur in photodistribution, are macules, papules, and blisters that resolve with crusts.

Resolving Quandaries in Dermatology, Pathology & Dermatopathology


…m of morphologic overlap [of solar lentigines] with pigmented actinic keratoses, with pigmented seborrheic keratoses, and with the freckle induced by psoralen UV therapy (PUVA freckles).” “The so-called ‘labial lentigo’ (&#821…

Dermatology Practical & Conceptual

Strategies for early recognition of cutaneous melanoma-present and future

…iple colors (black, brown, white). The surrounding skin shows actinic damage. [Copyright: ©2012 Brehmer et al.] Figure 2. A nodular melanoma (NM) that developed secondarily within a superficial spreading melanoma on the back (Breslow thickness 3.5 mm…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology


…rmatological types, characterized by nonpruriginous erythmato-squamous spots, extremely persistent and rebellious to all treatment. It is exclusively the objective appearance of these dermatoses which led to their mutual approximation to psoriasis. T…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Keratosis Lichenoides Chronica?

…e perivascular and periadnexal infiltrate with numerous giant cells in the “subpapillary portion of the corium.” The infiltrate also was situated in dermal papillae, around eccrine glands, and in adipose tissue. The extensions of follicul…

Histologic Diagnosis of Inflammatory Skin Diseases

Sebaceous Units

…ebaceous gland marks the site where lipid-producing glandular cells of sebaceous lobules meet stratified squamous epithelium of an infundibulum. A sebaceous duct is lined by a thin cornifying squamous epithelium with a barely detectable granular zone…

Histologic Diagnosis of Inflammatory Skin Diseases


…hin cornoid lamella = Porokeratosis, disseminated superficial actinic  The cornoid lamella on the left springs from an infundibulum. Cornoid lamellae also may emanate from eccrine ducts or surface epidermis itself. The condition was named porokeratos…

Differential Diagnosis in Dermatopathology


…hologic develop in them. Those range from formation of “squamous eddies” to development of nuclear abnormalities that may simulate vaguely the kind seen in squamouscell carcinoma. Of the three major patterns of seborrheic keratoses, name…

Histologic Diagnosis of Inflammatory Skin Diseases

Polymorphous light eruption

…e extent of exposure to ultraviolet light Variations clinical Actinic prurigo is a type of polymorphous light eruption that occurs in Indians of North and South America. Spring eruption of juveniles consists of vesicles on helices of boys. Differenti…