The cancer patient complains of facial and neck swelling, assessment findings reveal periorbital edema and distention of the veins in the chest. Based on these findings, the nurse should suspect which oncologic emergency?

A. Syndrome of inappropriate secretions of antidiuretic hormone (SIADH): SIADH is characterized by water retention, hyponatremia, and low serum osmolality. While it can occur in cancer patients, it does not typically cause facial and neck swelling or distended chest veins, making it unlikely in this scenario. B. Disseminated intravascular coagulation (DIC): DIC is a systemic coagulopathy leading to both thrombosis and bleeding. Clinical manifestations include petechiae, ecchymoses, and bleeding, not venous distention or facial edema. DIC does not explain the localized obstruction of venous return. C. Pericardial effusion/tamponade (PE/T): Cardiac tamponade causes jugular venous distention, hypotension, and muffled heart sounds (Beck’s triad). While there may be venous congestion, the edema is usually generalized, not limited to the face, neck, and upper chest, and periorbital edema is less typical. D. Superior vena cava syndrome (SVC): SVC syndrome results from obstruction of the superior vena cava, often due to malignancy compressing the vessel. This obstruction impairs venous return from the head, neck, and upper extremities, leading to facial and periorbital edema, neck swelling, and distended chest veins. It is an oncologic emergency requiring prompt recognition and intervention.