Pseudocarcinomatous hyperplasia (PCH) is a benign reactive epithelial proliferation that may be associated to lymphomas of the skin or external mucous membranes. We present a case of single lesion mycosis fungoides (Woringer-Kollop's reticulosis pagetoid) associated with PCH that was initially misdiagnosed as squamous cell carcinoma (SCC) and review all PubMed-indexed previously reported cases on lymphomas of the skin or external mucous membranes associated to PCH, SCC, and keratoacanthomas. Including our own case, we collected data of 114 cases of cutaneous or mucosal lymphoproliferative disorders associated to PCH, 3 cases associated to SCC, and other 3 cases associated to keratoacanthomas. All cases were tabulated to the following parameters whenever data was available: sex, age, previous medical conditions, number of lesions (single × multiple), site of involvement (mucosa, skin or both), clinical impression, initial equivocal histopathologic diagnosis, final diagnosis, keratinocytic atypia (presence × absence), lymphocytic atypia (presence × absence), CD30-status, and treatment.

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A Dermatite atópica faz parte da tríade atópica - dermatite atópica, asma e rinite alérgica - e é caracterizada por surtos eczematosos inflamatórios e pruriginosos. Esse quadro pode progredir para uma sensibilização às proteínas do leite de vaca, ovo ou amendoim e ainda para uma sensibilização aos aeroalérgenos. Assim, o presente estudo tem como objetivo analisar a relação entre a dermatite atópica e as alergias.

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