74 YO Woman with an episode of confusion

Results of appropriate testing return and show the following:

Serum:

Test (units)	Result	Results (SI Units)
Sodium	133 mEq/L	133 mmol/L
Potassium	4.0 mEq/L	4.0 mmol/L
Chloride	102 mEq/L	102 mmol/L
Bicarbonate	22 mEq/L	22 mmol/L
BUN	12 mg/dL	4.3 mmol/L
Creatinine	0.8 mg/dL	71 micromol/L
Calcium level	9.0 mg/dL	2.25 mmol/L
Magnesium level	2.0 mEq/L	1.0 mmol/L
Glucose	70 mg/dL	3.9 mmol/L
ALT	10 U/L	0.17 mckat/L
AST	10 U/L	0.17 mckat/L
Albumin	4.0 g/dL	40 g/L
Alcohol level	10 mg/dL	2.2 mmol/L

• Urine toxicology screen: Negative


• ECG: Normal sinus rhythm, no acute changes


• CT scan without contrast: No intracranial hemorrhage or mass effect; ill-defined rounded mass adjacent to the dura of the posterior falx.