Annular Lichenoid Dermatosis of Youth Alejandro A. Gru DEFINITION Annular lichenoid dermatosis of youth (ALDY) is a clinicopathologic entity originally described in children and young patients, which is clinically reminiscent…
Pseudolymphomas at Sites of Vaccination and in Tattoos Priyadharsini Nagarajan INTRODUCTION Introduction of extraneous materials in the form of tattoos and vaccines can induce a cutaneous inflammatory infiltrate that clinically…
Mucocutaneous Lymphoproliferative Disorders in Acquired Immunodeficiency Alejandro A. Gru Melissa Pulitzer András Schaffer INTRODUCTION This chapter reviews mucocutaneous lymphoproliferative disorders (LPD) in the setting of various types of acquired immunosuppression,…
Cutaneous Lymphoid Hyperplasia and Related Entities Alejandro A. Gru INTRODUCTION Cutaneous lymphoid hyperplasia (CLH) refers to a heterogeneous group of “reactive” T- and B-cell processes that simulate cutaneous lymphomas both…
Pseudolymphomatous Reactions With Associated Cutaneous Neoplastic Proliferations Sara C. Shalin Bruce R. Smoller INTRODUCTION On occasion, neoplasms may be so infiltrated by inflammatory cells that a lymphomatous process is considered…
Alopecia Mucinosa/Follicular Mucinosis Robert A. Lee DEFINITION Alopecia mucinosa (AM) and follicular mucinosis (FM) refer to the same entity. AM describes the clinical manifestation, whereas FM denotes the classic histopathologic…
Cutaneous Lupus Erythematosus Ilana S. Rosman INTRODUCTION Lupus erythematosus is a complex multisystem inflammatory condition with a variety of cutaneous manifestations. A complete discussion of the clinical and histologic findings…
CD30 Pseudolymphomas Jacqueline M. Junkins-Hopkins DEFINITION Cutaneous pseudolymphomas (CPLs) are benign lymphocytic infiltrates of the skin, which microscopically and immunophenotypically simulate cutaneous lymphoma, and yet do not have clinical corroboration…
Chronic Actinic Dermatitis—Actinic Reticuloid Sena J. Lee András Schaffer DEFINITION Chronic actinic dermatitis (CAD) is a unifying term for eczematous photodermatoses lasting for more than 3 months with abnormal sensitivity…
Pigmented Purpuric Dermatoses Casey A. Carlos DEFINITION The pigmented purpuric dermatoses (PPDs) are benign inflammatory conditions predominantly occurring in adults on the lower extremities. There are several variants, including Schamberg…
