In people who have had nongynecologic malignancy, approximately 20% of adnexal masses are malignant, and 60% of these are Krukenberg tumors.
Porro improved the so-called Cæsarean operation by excision of the uterus and adnexae, described in Della amputazione utero-ovarica come complemento di taglio cesareo (1876), the best known of his writings.