Dermatology Practical & Conceptual

Pigmented poroma with unusual location and dermatoscopic features

Abstract Poroma is a benign adnexal neoplasm with “poroid”/ductal differentiation that mimics benign and malignant skin tumors. Histopathology shows circumscribed proliferation of poroid cells intermingled with a variable number of cutic…

Dermatology Practical & Conceptual

The dermatoscopic universe of basal cell carcinoma

Abstract Following the first descriptions of the dermatoscopic pattern of basal cell carcinoma (BCC) that go back to the very early years of dermatoscopy, the list of dermatoscopic criteria associated with BCC has been several times updated and rene…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Inverted Follicular Keratosis, Tricholemmoma, and Desmoplastic Tricholemmoma?

“For about the last 8 years my associates and I have been observing a lesion—a keratosis—which occurs mostly on the face: I should say about 90 percent on the face, the remainder on other parts of the body. These lesions are characterized cli…

Differential Diagnosis in Dermatopathology

Trichoblastoma, small nodular type vs. Trichoblastoma, large nodular type

A condition of persons of any age, but particularly children with a genetic proclivity for allergic rhinitis and conjunctivitis, and allergic asthma. Intense pruritus induces patients to rub the skin intensely and to scratch furiously, the resultant…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Dermatofibroma?

“Cutaneous fibroma Fibroma simplex Simple fibroma of the skin, as defined above, is a benign tumor, usually appearing solitary, on the upper part of the body and the extremities, which, mainly imbedded in the skin, is only rarely and little…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Cutaneous Horn?

“Cutaneous horns may complicate solar keratoses, viral warts, seborrheic warts, squamous cell carcinomas, lichenoid keratoses, and basal cell carcinomas.” McKee PH. Tumors of the surface epithelium. In: Pathology of the Skin with Clinic…

Differential Diagnosis in Dermatopathology

Images

Dermatofibroma, hemorrhagic papulo-nodule Kaposi’s sarcoma, hemorrhagic papulo-nodule

Differential Diagnosis in Dermatopathology

Differential Diagnosis

Dermatofibroma, hemorrhagic papulo-nodule Kaposi’s sarcoma, hemorrhagic papulo-nodule 1. Poorly circumscribed; border sometimes jagged 1. Well-circumscribed; border smooth 2. Epidermis acanthotic and hyperpigmented 2. Epidermis thinned a…