Vena Caval Hematoma Secondary to Adrenal Hemorrhage From an Addisonian Crisis in a Dog

An 11-year-old spayed female American Staffordshire Terrier was evaluated for an Addisonian crisis. Abdominal CT scan revealed a mass-like lesion arising from the right adrenal gland and invading into the vena cava. The patient was treated for an Addisonian crisis, and no further treatment for the right adrenal gland mass was pursued by the clients. The patient presented 1 year later for re-evaluation of the right adrenal gland mass, and an abdominal CT scan was performed, which showed the previous right adrenal gland mass had resolved, and both adrenal glands were now atrophied. Adrenal hemorrhage can occur following an Addisonian crisis, and this is the first case report with imaging studies documenting this phenomenon.