Abstract Multiple endocrine neoplasia type 1 (MEN1) syndrome is a rare autosomal dominant disorder characterized by predisposition to a multitude of endocrine neoplasms. Cushing syndrome (CS) within MEN1 presents complex diagnostic and therapeutic challenges. We report a case of a 36-year-old male with adrenocorticotropic hormone (ACTH)-dependent Cushing disease and MEN1 syndrome with thymic and pancreatic neuroendocrine tumors. The patient presented with weight gain, weakness and proximal myopathy. Biochemical testing confirmed ACTH-dependent hypercortisolism. Imaging revealed a pituitary microadenoma, a large anterior mediastinal mass, and pancreatic lesions. Genetic analysis confirmed a pathogenic heterozygous MEN1 frameshift variant. After thymectomy, he declined further surgery. Treatment with thymectomy and octreotide long-acting release (LAR) was ineffective. Initiation of osilodrostat (titrated to 5 mg twice daily) resulted in a 76% reduction in urinary cortisol levels and a 47 kg weight loss, with significant functional improvement. Pancreatic and pituitary lesions remained stable. This is the first reported case of successful symptom management of MEN1-associated Cushing disease with osilodrostat, establishing it as an effective therapeutic option for medically complex MEN1 cases where surgery is not feasible or is declined.
Hasan Frookh Jamal (Thu,) studied this question.