Dermatology Practical & Conceptual

Linear sebaceous hyperplasia on the chest

…the chest with linear distribution pattern. (B) Dermoscopy of sebaceous gland hyperplasia. Note the aggregation of yellowish-white clods with linear vessels between or above the clods. (C) Dermoscopy of sebaceous gland hyperplasia followed by HDR im…

A Clinical Atlas of 101 Common Skin Diseases

Dermatofibroma

An inflammatory process that develops secondary to trauma, usually in the form of a penetrating injury or rupture of a follicle, and that proceeds through stages of granulation tissue with numerous extravasated erythrocytes, granulomatous inflammati…

A Clinical Atlas of 101 Common Skin Diseases

Nevus Sebaceus

A hamartoma of epidermis, epithelial structures of adnexa, and presumably dermal elements, typified, when fully formed, by a papillated or verrucous yellowish plaque situated usually on the scalp. The condition may present itself as a solitary lesio…

Differential Diagnosis in Dermatopathology

Differential Diagnosis

Cyst is preserved intact during processing of the specimen 3. Cyst often collapses during processing of the specimen 4. Contents of the cyst cornified cells mostly 4. Contents of the cyst secretion mostly sebaceous 5. No hairs within the cyst 5….

Histologic Diagnosis of Inflammatory Skin Diseases

Images

…histiocytes around hairs and other contents of an infundibular cyst = Granulomatous panniculitis secondary to rupture of an epidermal (infundibular) cyst┬áThe contents of an infundibular cyst, i.e., squames, sebaceous secretion, bacteria, yeasts, and…

Differential Diagnosis in Dermatopathology

Discussions

…epithelial and connective tissue components that surround the cyst. Infundibulo-folliculo-sebaceous cystic hamartoma consists of an infundibular cyst from which radiate sebaceous lobules that are connected to the cyst by well-defined sebaceous ducts…

Differential Diagnosis in Dermatopathology

Dilated pore vs. Pilar sheath acanthoma

A hamartoma of epidermis, epithelial structures of adnexa, and presumably dermal elements, typified, when fully formed, by a papillated or verrucous yellowish plaque situated usually on the scalp. The condition may present itself as a solitary lesio…