Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Basal-Cell Carcinoma Common in Nevus Sebaceus?

…lue-gray corneocytes of the inner sheath, and, episodically as pale or clear cells of outer sheath, as well as epidermal epithelium like that of the infundibulum. All of this comes about because trichoblasts are abnormal equivalents of germinative ce…

Histologic Diagnosis of Inflammatory Skin Diseases

Subcutaneous T-cell lymphoma

…mis and subcutaneous fat. Histiocytosis X (Langerhans” cell histiocytosis) consists of a dense infiltrate of abnormal Langerhans” cells characterized by large, pale, reniform nuclei and abundant amphophilic cytoplasm, many eosinophils,…

Differential Diagnosis in Dermatopathology

Granular-cell tumor vs. Xanthoma

Malignant neoplasms of B-lymphocytes especially that present themselves usually as papules, nodules, and tumors, sometimes solitary but at other times numerous, and often in clusters on any anatomic site. When "primary," B-cell lymphomas o…

Differential Diagnosis in Dermatopathology

Trichoepithelioma vs. Infundibulocystic basal-cell carcinoma

Malignant neoplasms of B-lymphocytes especially that present themselves usually as papules, nodules, and tumors, sometimes solitary but at other times numerous, and often in clusters on any anatomic site. When "primary," B-cell lymphomas o…

Differential Diagnosis in Dermatopathology

Apocrine (clear-cell) hidradenoma vs. Eccrine (poroid) hidradenoma

Malignant neoplasms of B-lymphocytes especially that present themselves usually as papules, nodules, and tumors, sometimes solitary but at other times numerous, and often in clusters on any anatomic site. When "primary," B-cell lymphomas o…

Differential Diagnosis in Dermatopathology

"Pseudolymphoma," B-cell type vs. Malignant lymphoma, B-cell type

Malignant neoplasms of B-lymphocytes especially that present themselves usually as papules, nodules, and tumors, sometimes solitary but at other times numerous, and often in clusters on any anatomic site. When "primary," B-cell lymphomas o…