Figure 7.

Bar graphs depicting the percentage of hyperthyroid cats with ectopic thyroid tumor tissue, suspected thyroid carcinoma, or SHIM-RAD tumors in each of five groups, based on the time from diagnosis: group 1, ⩽1 year; group 2, >1–2 years; group 3, >2–3 years; group 4 >3–4 years; and group 5, >4–6.1 years. Cats in the SHIM-RAD subgroup had the following five features: (1) severe hyperthyroidism (serum thyroxine >300 nmol/l); (2) huge tumors; (3) intrathoracic tumor location; (4) multifocal distribution of radionuclide uptake; and (5) refractory to treatment with antithyroid drugs