Physiology-5

A very thin 15-year-old female presents with
headache, polyuria, and grand mal seizures.
She answers the question, if she has had to
vomit recently, with “frequently” but that these
symptoms “are under control now.” Her body
mass index is 14.1. Serum glucose, calcium, and
potassium are normal. Serum sodium, chloride,
and osmolarity are low. As a working diagnosis,
which of the following is most likely?
(A) Addison disease
(B) central diabetes insipidus
(C) diabetes mellitus
(D) nephrogenic diabetes insipidus
(E) water intoxication

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