Tumores en colisión: queratosis seborreica con nevus melanocítico. Estudio dermatoscópico e histopatológico a propósito de dos lesiones / Collision tumours: seborrheic keratosis and melanocytic nevus. Dermoscopy and histopathology of two lesions

Los tumores en colisión son raros, y representan la asociación de más de una neoplasia en un mismo preparado histológico y separados por menos de 1 mm. Aunque los nevus melanocíticos y las queratosis seborreicas son tumores frecuentes, hay pocos casos publicados de esta asociación. Comunicamos el de un hombre de 54 años, con historia de síndrome de nevus displásico y melanoma, que consultó por dos lesiones pigmentadas con cambios recientes. El caso fue estudiadocon dermatoscopia e histopatología.

Seborrheic Keratosis of the Conjunctiva: A Case Report

Seborrheic keratosis is a benign epithelial neoplasia that occurs mainly in the skin of the eyelids and face. We describe a case of seborrheic keratosis of the conjunctiva confirmed by histopathology. A 72-year-old man presented with a recurrent conjunctival mass involving the nasal side of his right eye. Clinically, a diagnosis of conjunctival papilloma was made, and a mass excision was performed. The histopathological analysis evidenced a conjunctival-covering epithelium with papillomatous changes and irregular acanthosis, at the expense of a proliferation of basaloid cells. In addition, the lesion exhibited multiple pseudohorn cysts containing keratin. With the above findings, a diagnosis of conjunctival seborrheic keratosis was established. The occurrence of seborrheic keratosis on the conjunctiva is rare. In this case, seborrheic keratosis was confirmed by pathologic report despite its similar appearance with papilloma. Seborrheic keratosis should be considered in the differential diagnosis of conjunctival lesions.

Seborrheic keratosis of the conjunctiva.

Seborrheic keratosis can simulate a malignant melanoma and should form the differential diagnosis of a malignant melanoma. Histopathology is confirmatory.