Primary hyperaldosteronism is an adrenocortical disorder characterized by an adrenal tumor which secretes excessive aldosterone leading to systemic hypertension and hypokalemia. Primary hyperaldostcronism, or Conn's syndrome, is an uncommon diagnosis; however, it is likely the most common adrenocortical disorder in the cat and an underdiagnosed cause of hypertension in this species. This case report will focus on diagnosing feline hyperaldosteronism in a 14 year old spayed female domestic short hair which was presented through Cornell's Emergency service for acute neurologic signs. The stepwise approach to diagnosis, including the use of advanced imaging, the role of aldosterone in creating hypertension, as well as treatment options for an aldosterone secreting adrenal tumor will be discussed.