Differential Diagnosis in Dermatopathology

Dilated pore vs. Pilar sheath acanthoma

Keratotic spikes that emerge from dilated ostia of infundibula and are equidistant from one another. The term keratosis pilaris refers to the phenomenon when it presents itself without any distinct arrangement of individual lesions, whereas the desi…

Histologic Diagnosis of Inflammatory Skin Diseases

Mycosis fungoides

Mycosis fungoides Synonyms Cutaneous T-cell lymphoma Presentation stereotypical Age and Sex Adults usually, although children may be affected. Males preponderant. Distribution of lesions Often widespread, but sometimes localized to a single patch or…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Keratosis Lichenoides Chronica?

“So we have to start once more [in regard to what is the authentic nature of lichen rubra moniliformia], returning to the old case of Kaposi by which the question began in 1886.” Pinkus H. Lichen ruber moniliformis Kaposi. Arch Dermato…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Eccrine Neoplasms?

…giomatous hamartoma Syringofibroadenoma or acrosyringeal nevus Comedo nevus of the palm, linear eccrine nevus with comedone, porokeratotic eccrine ostial nevus or porokeratotic eccrine duct and hair follicle nevus. Eccrine adenoma Eccrine hidrocystom…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Follicular Occlusion Triad?

…adolescence. A correlate of the clich? is that the finding of comedones allows acne vulgaris to be distinguished clinically from other types of acne, such as “steroid acne” and “acne rosacea.” In actuality, comedones are not…

Histologic Diagnosis of Inflammatory Skin Diseases

Dermatofibroma

Dermatofibroma Synonyms Benign fibrous histiocytoma Fibroma dura Subepidermal nodular sclerosis Histiocytoma Histiocytoma cutis Sclerosing hemangioma Fibroma simplex or fibroma durum Nodulus cutaneus Fibrome en Pastille Dermatofibroma lenticulare De…

Histologic Diagnosis of Inflammatory Skin Diseases

Keratotic spikes that emerge from dilated ostia of infundibula and are equidistant from one another. The term keratosis pilaris refers to the phenomenon when it presents itself without any distinct arrangement of individual lesions, whereas the desi…

Differential Diagnosis in Dermatopathology

Discussions

These two common cutaneous cysts have several features in common, namely, lining of stratified squamous epithelium and cornified cells in their cavity. We name cysts according to the normal epithelial structure of skin that the lining of the cyst re…

Differential Diagnosis in Dermatopathology

Infundibular cyst vs. Isthmus-catagen cyst

Keratotic spikes that emerge from dilated ostia of infundibula and are equidistant from one another. The term keratosis pilaris refers to the phenomenon when it presents itself without any distinct arrangement of individual lesions, whereas the desi…