Type 1 is estrogen-related endometrioid carcinoma divided into subtypes, adenocarcinomas with squamous differentiation further subdivided into adenocarcinoma with squamous metaplasia (adenoacanthoma) and adenosquamous carcinoma, secretory, ciliated cell, and villoglandular variants [14].
Similarly the premalignant and malignant conditions associated with the horns7,8 include adenoacanthoma, actinic keratosis, Bowen's disease, arsenical keratosis, Paget's disease, Kaposi sarcoma, malignant melanoma, sebaceous carcinoma9 and squamous cell carcinoma.