MSH: A hereditary disease characterized by multiple ectodermal, mesodermal, and endodermal nevoid and neoplastic anomalies. Facial trichilemmomas and papillomatous papules of the oral mucosa are the most characteristic lesions. Individuals with this syndrome have a high risk of BREAST CANCER; THYROID CANCER; and ENDOMETRIAL CANCER. This syndrome is associated with mutations in the gene for PTEN PHOSPHATASE.,NCI: An inherited disorder marked by the formation of many noncancerous growths called hamartomas. These growths occur in the skin, breast, thyroid, colon, intestines, and inside of the mouth. Patients with Cowden syndrome are at increased risk of certain types of cancer, including breast and thyroid.,NCI: An autosomal dominant hereditary syndrome characterized by a variety of hamartomas and neoplasms including verrucous skin lesions, fibromas of the oral cavity, facial trichilemmomas, hamartomatous colonic polyps, thyroid neoplasms, breast cancer, and dysplastic gangliocytomas of the cerebellum.