en Dermatology Dermatology case report case report The association of pemphigus and thymoma is real, although rare. We report a 73-year-old woman presenting with cutaneous bullac and erosions superimposed on erythematous and urticarial plaques, and a positive Nikolsky sign. She. had a large mediastinal mass that proved to be a benign thymoma. Her skin biopsy and direct immunofluorescence test were suggestive of superficial pemphigus. Thymoma, Pemphigus 411 413 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-298-303&slc_lang=en&sid=1 M DANESHPAZHOOH maryamdanesh@yahoo.com 20031947532846004321 20031947532846004321 Yes From the Departments of Dermatology, Razi Hospital, Tehran University of Medical Sciences, Tehran, I.R. Iran. C CHAMS 20031947532846004322 20031947532846004322 No From the Departments of Dermatology, Razi Hospital, Tehran University of Medical Sciences, Tehran, I.R. Iran. ZS NARAGHI 20031947532846004323 20031947532846004323 No From the Departments of Pathology, Razi Hospital, Tehran University of Medical Sciences, Tehran, I.R. Iran M AKHYANI 20031947532846004324 20031947532846004324 No From the Departments of Dermatology, Razi Hospital, Tehran University of Medical Sciences, Tehran, I.R. Iran. S ARAD 20031947532846004325 20031947532846004325 No From the Departments of Dermatology, Razi Hospital, Tehran University of Medical Sciences, Tehran, I.R. Iran. SZ GHODSI 20031947532846004326 20031947532846004326 No From the Departments of Dermatology, Razi Hospital, Tehran University of Medical Sciences, Tehran, I.R. Iran. S SOTOODEH 20031947532846004327 20031947532846004327 No From the Departments of Dermatology, Razi Hospital, Tehran University of Medical Sciences, Tehran, I.R. Iran.