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Cryosurgery is the use of extreme cold in surgery to destroy abnormal or diseased tissue thus, it is the surgical application of cryoablation. Cryosurgery has been historically used to treat several diseases and disorders, especially a variety of benign and malignant skin conditions. Warts, moles, skin tags, solar keratosis, Morton's neuroma and small skin cancers are candidates for cryosurgical treatment. Several internal disorders are also treated with cryosurgery, including liver cancer, prostate cancer, lung cancer, oral cancers, and cervical disorders and, more commonly in the past, hemorrhoids. Soft tissue conditions such as plantar fasciitis (jogger's heel) and fibroma (benign excrescence of connective tissue) can be treated with cryosurgery. Generally, all tumours that can be reached by the cryoprobes used during an operation are treatable. Although found to be effective, this method of treatment is only appropriate for use against localized disease, and solid tumours larger than 1 cm. Tiny, diffuse metastases that often coincide with cancers are usually not affected by cryotherapy.