Case of Hypercalcemia Secondary to Hypervitaminosis A in a 6-Year-Old Boy with Autism

Table 3

Causes of hypercalcemia.

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Parathyroid hormone-related

Primary hyperparathyroidism

 Sporadic

 Familial

 MENI or MENII

Tertiary hyperparathyroidism

 Associated with renal insufficiency

Vitamin D-related

Vitamin D intoxication

Granulomatous disease

Malignancy

Humoral hypercalcemia of malignancy

(Associated with PTHrP)

Solid tumors

Medications

Thiazide diuretics

Lithium

Milk-alkali syndrome

Vitamin A intoxication

Other endocrine disorders

Hyperthyroidism

Adrenal insufficiency

Acromegaly

Pheochromocytoma

Familial hypocalciuric hypercalcemia (FHH):

(Mutation in calcium-sensing receptor)

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