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Adenomatoid tumor of the skin: Differential diagnosis of an umbilical erythematous plaque

par Ferreira, Ingrid ;De Lathouwer, Olivier G.;Fierens, Hugues;Theunis, Anne;André, Josette ;De Saint Aubain, Nicolas
Référence Journal of cutaneous pathology, 48, 1, page (128-132)
Publication Publié, 2021-01-01

Article révisé par les pairs

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Résumé :

Adenomatoid tumors are benign tumors of mesothelial origin that are usually encountered in the genital tract. Although they have been observed in other organs, the skin appears to be a very rare location, with only one case reported in the literature to our knowledge. We report a second case of an adenomatoid tumor, arising in the umbilicus of a 44-year-old woman. The patient presented with an 8-month-old erythematous and firm plaque under the umbilicus. A skin biopsy showed numerous microcystic spaces dissecting a fibrous stroma and lined by flattened to cuboidal cells with focal intraluminal papillary formation. This little-known diagnosis constitutes a diagnostic pitfall for dermatopathologists and dermatologists, and could be misdiagnosed as other benign or malignant entities. Through this case report, a practical approach and diagnostic keys have been devised to avoid misdiagnosis and overtreatment.