Epithelioid Hemangioendothelioma (EHE) Mimicking Mesothelioma: Case Presentation and Review.

Epithelioid hemangioendothelioma (EHE) is an extremely rare vascular sarcoma that can initially present with a myriad of symptoms anywhere in the body. Imaging findings are often nonspecific, and the pathology tends to have overlap with other malignancies. As a result, it can be quite difficult to suspect and diagnose EHE. We present a case of pulmonary EHE in a 41-year-old female with left pleural thickening and subclavian tumor thrombus who was initially misdiagnosed and treated as mesothelioma. This instance demonstrates the importance of maintaining a broad differential and the utilization of repeat biopsies and next-generation sequencing for questionable diagnoses of atypical malignancies.