A 54-year-old woman with primary hyperparathyroidism underwent parathyroid exploration following negative ultrasonography, CT and 99Tc-201T1 scintigraphy. A 2 × 1.5 × 1-cm large mass dorsal to the midportion of the left thyroid lobe was extirpated and a hyperfunctional lipoadenoma containing 70% or more of fatty tissue was verified microscopically. Retrospective evaluation of CT revealed a well demarcated lipomatous mass with a homogeneous density similar to that of subcutaneous fat corresponding to the surgical finding.
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