title: Functioning parathyroid cyst extending from neck to anterior mediastinum. Diagnosis by sonography and computed tomography.
abstract: A parathyroid cyst was evaluated by sonography and computed tomography (CT) in a patient with hyperparathyroidism. Sonography demonstrated a cystic lesion near the left lower pole of the thyroid, extending into the anterior mediastinum. On CT, the parathyroid cyst had a slightly high attenuation (30 H), with a smooth wall demonstrated after intravenous administration of contrast material. Fine-needle aspiration biopsy of the cyst showed elevated parathyroid hormone (PTH) level. The lesion probably represents cystic degeneration of an adenoma.
mesh_terms: D000368:Aged; D003560:Cysts / Q000150:complications / Q000175:diagnosis* / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D006961:Hyperparathyroidism / Q000209:etiology; D010279:Parathyroid Diseases / Q000150:complications / Q000175:diagnosis* / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed; D014463:Ultrasonography