A Giant Thoracic Mass and Hypoglycemia: Suspected Solitary Fibrous Tumor-related Doege-Potter Syndrome

A 96-year-old woman was brought to the emergency department with impaired mobility and generalized edema. She appeared drowsy, and blood glucose testing demonstrated severe hypoglycemia (38 mg/dL). Chest radiography showed an opacity in the right lower lung field, and computed tomography revealed a large intrathoracic mass. Laboratory testing revealed low serum insulin and C-peptide levels, suggesting non-islet cell tumor hypoglycemia. She had previously been diagnosed with a solitary fibrous tumor via a percutaneous biopsy at another hospital. Corticosteroids and glucose supplementation resolved the recurrent hypoglycemia. In patients with hypoglycemic episodes without diabetes and abnormal chest radiographic opacities, Doege-Potter syndrome should be considered.