The most common of all causes of SIADH is a small cell carcinoma of the lung.
Other neoplasms that may cause SIADH include:
It is probably true to say that nearly every sort of tumour may cause SIADH; an obscure exception, which would be irrelevant except that it is beloved of multiple choice setters, is non-metastatic papillary carcinoma of the thyroid.
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