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  • Title: Cushing's syndrome associated with a chemodectoma and a carcinoid tumour.
    Author: Tremble JM, Buxton-Thomas M, Hopkins D, Kane P, Bailey D, Harris PE.
    Journal: Clin Endocrinol (Oxf); 2000 Jun; 52(6):789-93. PubMed ID: 10848885.
    Abstract:
    We present a case of Cushing's syndrome where 111In-octreotide scanning provided evidence for the presence of two neuroendocrine tumours. Uptake in the right neck corresponded to a chemodectoma, but there was no change in the clinical condition or fall in ACTH levels following surgical resection. Uptake in the left chest was assumed to relate to a bronchial carcinoid, but a tumour could not initially be localized on magnetic resonance imaging (MRI), spiral CT scanning or on selective venous sampling. A 1 cm bronchial carcinoid tumour was identified post-mortem which immunostained for ACTH. This case demonstrates that 111ln-octreotide scanning is a useful technique for identifying the source of ectopic ACTH production in difficult cases of Cushing's syndrome. Reliance should not be placed solely on standard imaging techniques to localize the tumour prior to surgery. Although rare, the possibility of a non-ACTH secreting neuroendocrine tumour should also be considered in patients with ectopic ACTH syndrome, who have positive 111In-octreotide scans.
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