The bizarre appearance of intrathoracic extramedullary hematopoiesis during an endoscopic ultrasound examination

A 61-year-old man was referred for evaluation of bilateral, intrathoracic, paravertebral masses suspicious for malignancy ([Fig. 1 a, b]). The lesions had been incidentally detected in the thoracic slices of an abdominal computed tomography (CT) performed to investigate suspected kidney stones. The patient had no thoracic complaints and had an unremarkable past medical history. Given the proximity to the esophagus, an endoscopic ultrasound (EUS)...