Giant perianal seborrheic keratosis as a manifestation of the Leser-Trelat syndrome

Seborrheic keratosis is the most common benign tumor of the epidermis. Rarely the tumor develops in the perineal area and quite rarely is large. For the Leser-Trelat syndrome these tumors is a marker of a malignant disease even before the symptoms are appeared, as well as a manifestation of the paraneoplastic process. In our case report, a giant perianal seborrheic keratoma was the reason for the clinical examination of the patient and stomach cancer was detected. As a result, we demonstrated a successful experience of surgical treatment of seborrheic keratoma of the perianal area and determined an algorithm for the treatment of stomach cancer.