What imaging test is recommended to locate a pheochromocytoma?

The CT scan is the preferred imaging test for locating a pheochromocytoma, which is a tumor of the adrenal gland that secretes catecholamines, leading to symptoms such as hypertension, sweating, and palpitations. This imaging modality provides detailed cross-sectional images of the abdomen, allowing for accurate visualization of the adrenal glands where pheochromocytomas typically arise. A CT scan can effectively identify both the presence and size of the tumor, as well as any possible metastases.

In contrast, an MRI of the brain is not relevant in this context because pheochromocytomas are not brain tumors, and their location is specific to the adrenal glands. An ultrasound of the abdomen may help in some cases but generally offers less detail compared to a CT scan and may miss smaller tumors. Lastly, a chest X-ray does not provide information about adrenal tumors, making it unsuitable for this particular investigation. Thus, the CT scan stands out as the most effective tool for the diagnosis of pheochromocytoma.