Papillary thyroid cancer associated with syndrome of inappropriate antidiuresis: a case report

<p>Abstract</p> <p>Introduction</p> <p>The syndrome of inappropriate antidiuresis is the most common cause of euvolemic hypo-osmolality. This syndrome is associated with a wide variety of diseases. However, its most frequent causes are related to malignancies, especially lung cancer. In this case report, we describe an unknown association of the syndrome of inappropriate antidiuresis with papillary thyroid cancer.</p> <p>Case presentation</p> <p>We present the case of a 71-year-old Caucasian, German woman with marked hyponatremia and neurological symptoms. After a detailed clinical investigation, the common causes of syndrome of inappropriate antidiuresis and other malignancies were ruled out. A thyroid nodule was detected by ultrasound and magnetic resonance imaging. Although fine needle aspiration cytology showed negative results, our patient underwent surgery. Papillary thyroid cancer was later diagnosed. After total thyroidectomy, a complete remission of the clinical symptoms occurred and our patient subsequently had iodine-131 radioactive therapy. Hyponatremia was no longer observed during the follow-up investigations.</p> <p>Conclusion</p> <p>This is the first reported case of paraneoplastic syndrome of inappropriate antidiuresis caused by papillary thyroid carcinoma. Since its symptoms occurred before the development of local symptoms, total thyroidectomy may provide a timely and efficient treatment for the underlying malignancy.</p

Reversibles metabolisches Syndrom hormoneller Ursache

A 52-year-old male patient was admitted to the emergency department with dyspnea and hypertensive urgency. During the previous 6 months, the patient had noticed leg edema, weight gain (particularly in the face and abdomen), and impotence. 1.5 years ago, he was diagnosed with hypertension resistant to medication. After an accident at work 1 year ago, osteoporosis was diagnosed with vertebral and rib fractures. Measurement of sleeping midnight salivary cortisol levels together with 24-h urine free cortisol excretion and an overnight low-dose 1-mg dexamethasone suppression test proved overt hypercortisolism. The high-dose 8-mg dexamethasone suppression suggested an adrenal or ectopic source of hypercortisolism. By contrast, elevated adreno-corticotropic hormone (ACTH) levels and a corticotropin-releasing hormone stimulation test gave evidence for a pituitary source of hypercortisolism. However, pituitary magnetic resonance imaging failed to reveal a pituitary adenoma. Moreover, computed tomography scans of thorax and abdomen were negative. In this situation, an inferior petrosal vein sampling was performed and revealed an ACTH gradient (central-systemic) >3 with lateralization to the right side. The patient underwent a selective, partial, transsphenoidal resection and was cured from clinical signs and symptoms caused by hypercortisolism. Subsequent hormonal replacement therapy of postoperative pituitary insufficiency was necessary