Histologic Diagnosis of Inflammatory Skin Diseases

Pyoderma gangrenosum

Pyoderma gangrenosum Synonyms Phagedena goemoetrica Dermatitis gangrenosa Malignant pyoderma Presentation stereotypical Age and sex Adults of both sexes Distribution of lesions Localized usually to the lower extremities; widespread episodically In…

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…

Histologic Diagnosis of Inflammatory Skin Diseases

Graft-versus-host disease/Eruption of lymphocyte recovery

Graft-versus-host disease/Eruption of lymphocyte recovery Presentation stereotypical Age and sex Persons of any age and of both sexes who have received allogeneic bone marrow transplantation, reinfusion of autologous marrow, transplantation of solid…

Histologic Diagnosis of Inflammatory Skin Diseases

Polymorphous light eruption

Polymorphous light eruption Synonyms Polymorphic light eruption Summer prurigo Summer eruption Eczema solare Prurigo aestivalis Chronic polymorphous light eruption Hutchinson’s summer prurigo Presentation stereotypical Age and sex Young wome…

Dermatology Practical & Conceptual

Dermatoscopy: What is your diagnosis?

Quiz A 61-year-old patient with chronic myelomonocytic leukemia presented with a red-to-brown maculopapular rash on the back (Figure 1). Some of the papular lesions seemed to be different from the other lesions (Figures 2, 3) and had a particular de…

Resolving Quandaries in Dermatology, Pathology & Dermatopathology

Parapsoriasis?

“Parapsoriasis. Under this provisional name, Brocq in 1902 grouped several rare and unclassifiable dermatological types, characterized by nonpruriginous erythmato-squamous spots, extremely persistent and rebellious to all treatment. It is ex…

Differential Diagnosis in Dermatopathology

Differential Diagnosis

Mycosis fungoides, papular/plaque stage Adult T-cell leukemia/lymphoma, papular stage 1. No crusts as a rule 1. Crusts common 2. No collections of lymphocytes in the cornified layer usually 2. Collections of lymphocytes in the cornified layer…

Dermatology Practical & Conceptual

Uncommon presentations of tinea versicolor

Abstract Tinea versicolor (TV) is a common cutaneous fungal infection characterized by superficial scaling and a mild disturbance of skin pigmentation. It typically affects the chest, upper back, and shoulders. However, involvement of more unusual r…