Abstract
Myxoid lipoadenoma of the parathyroid gland is a rare variant of parathyroid adenoma. We present the case of a 40-year-old man with asymptomatic hypercalcemia who underwent surgical removal of a parathyroid adenoma. Histologically, the tumor consisted of monomorphous round-to-oval chief cells arranged in several architectural patterns including solid sheet-like, trabecular, and follicular. The tumor stroma was prominently myxoid with interspersed mature adipose tissue. Immunohistochemistry confirmed expression of thyroid transcription factor and parathyroid hormone by all tumor cells and a low proliferation rate with a Ki-67 labeling index of at most 5%. Although the lesion exhibited characteristics that have been previously associated with "atypical parathyroid adenoma," such as dense fibrous bands within the tumor and a trabecular growth pattern, there was no further evidence, neither histologically nor clinically, for malignant behavior of the tumor.
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