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The authors relate a case of paraneoplasic Cushing's syndrome by mediastinal tumor, probably of thymic origin. All the clinical and biological signs recall similar cases previously related. An "ACTH-like" substance has been found by biological method in a lymphoide metastasis. The main interest resides in the anatomo-pathological findings and more especially in electronic microscopy. The abundance of the neurosecretory granules is a characteristic feature of the malignant cells observed. These granules appear to the authors identical to those observed in other secretory thymomas and various tumors.
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