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arathyroid adenomas account for most cases of primary hyperparathyroidism. Parathyroid adenomas rarely attain huge proportions and since they are usually small in size, preoperative loca-lization using sestamibi scanning or ultrasono-graphy is required to avoid unnecessary bilateral neck exploration. We report herein the case of a 47 year old woman who was diagnosed as hav-ing a parathyroid tumor after she presented with bone pain. Detected by clinical findings, ultra-sonography and parathyroid scintigraphy by 99m Tc-MIBI, her tumor was found to be a huge adenoma of the parathyroid, measuring 5.5×3.5×2 cm and weighing approximately 30 grams. This size and weight of tumor is a very rare finding in parathyroid adenomas, and de-serves documentatio