Paraneoplastic Syndrome in Adrenocortical Carcinoma: The Unexpected Mime.

Adrenocortical carcinoma (ACC) is a malignancy of the adrenal cortex with a high morbidity and mortality. More than half of the cases are functional tumors. As different hormones can be co-secreted above physiologic levels, it causes a very broad variety of symptoms and makes differentiating from more common entities hard. Here we present a case of a patient with a newly diagnosed ACC who initially presented with acute pulmonary embolism and recurrent deep vein thromboses (DVT) in the setting of hypercortisolism. Imaging showed a left adrenal mass invading adjacent structures including a nonocclusive thrombus in the left renal vein. Intravenous anticoagulation and thrombectomy were initially performed, followed by removal of the tumor and adjacent metastatic disease. Pathology confirmed ACC. The patient underwent left adrenalectomy, left nephrectomy, splenectomy, distal pancreatectomy, and caval thrombectomy with inferior vena cava (IVC) filter placement. Intravenous anticoagulation and glucocorticoid replacement were also administered as part of the treatment plan. Unfortunately, the patient had multiple episodes of bleeding and thrombosis and was eventually discharged to hospice care. DVT in the setting of ACC can be caused by increased hypercoagulability from hypercortisolism, direct venous thrombosis, or vascular invasion. Thrombosis, especially in the inferior vena cava, has been associated with poor prognosis and survival rates. Clinicians should be aware of this rare complication given its immediate therapeutic repercussions and prognostic value.