If a computed tomography (CT) scan or lumbar puncture (LP) is positive in a patient with suspected Cerebral Adrenal Hyperplasia (CAH), what is the next appropriate step?

A) Initiate immediate treatment with corticosteroids
B) Confirm the diagnosis with genetic testing
C) Perform a detailed endocrine evaluation
D) Administer high-dose vitamin D supplementation
E) Order a brain MRI to assess pituitary function