 Related to this research, Virchow described the factors contributing to venous thrombosis, Virchow's triad.Virchow founded the medical fields of cellular pathology and comparative pathology (comparison of diseases common to humans and animals).His most important work in the field was "Cellular Pathology" ("Die Cellularpathologie in ihrer Begründung auf physiologische und pathologische Gewebelehre") published in 1858, as a collection of his lectures.