17 alpha-hydroxylase deficiency differential diagnosis

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Mehrian Jafarizade, M.D [2]

Overview

17 alpha-hydroxylase deficiency must be differentiated from diseases with primary amenorrhea and female external genitalia. Some of these causes include Pregnancy, androgen insensitivity syndrome, 3beta-hydroxysteroid dehydrogenase type 2 deficiency, 17-alpha-hydroxylase deficiency, gonadal dysgenesis, testicular regression syndrome, LH receptor defects, 5-alpha-reductase type 2 deficiency, mullerian agenesis, primary ovarian insufficiency, hypogonadotropic hypogonadism and turner syndrome.

Differentiating 17 alpha-hydroxylase deficiency from other Diseases

17 alpha-hydroxylase deficiency must be differentiated from diseases with primary amenorrhea. Some of these causes include androgen insensitivity syndrome, 3 beta-hydroxysteroid dehydrogenase deficiency, gonadal dysgenesis, testicular regression syndrome, LH receptor defects, 5-alpha-reductase type 2 deficiency, mullerian agenesis, primary ovarian insufficiency, hypogonadotropic hypogonadism and turner syndrome.

Differential diagnosis for primary amenorrhea:

Disease name	Cause	Differentiating
		Findings	Uterus	Breast development	Testosterone	LH	FSH	Karyotyping
17-alpha-hydroxylase deficiency	CYP17A1 gene mutation	Female external genitalia Primary amenorrhea Hypertension Absence of secondary sexual characteristics Minimal body hair	No	No	↓	Normal	Normal	XY
3 beta-hydroxysteroid dehydrogenase deficiency	HSD3B2 gene mutation	Undervirilization in 46,XY individuals due to a block in testosterone biosynthesis Mild virilization in 46,XX individuals	Yes in female	Yes in female	↓	Normal	Normal	XY and XX
Gonadal dysgenesis	Mutations in SRY, FOG2/ZFPM2, and WNT1	Female external genitalia Intact Mullerian ducts Streak gonads	Yes	Yes	↓	↑	↑	XY
Testicular regression syndrome	Loss of testicular function and tissue early in development	Female phenotype with atrophic Mullerian ducts	No	No	↓	↑	↑	XY
LH receptor defects	LH receptor gene mutation on chromosome 2	Female external genitalia Lack a uterus and fallopian tubes Epididymis and vas deferens may be present Laboratory: Unresponsiveness to hCG Normal levels of testosterone precursors (produced in the adrenal glands)	No	No	↓	↑	↑	XY
5-alpha-reductase type 2 deficiency	Autosomal recessive	Female external genitalia or ambiguous Bilateral testes and normal testosterone formation Impaired external virilization during embryogenesis Defective conversion of testosterone to DHT Testosterone:DHT ratio is >10:1	No	No	Normal male range	High to normal	High to normal	XY
Androgen insensitivity syndrome	Androgen receptor defect	Female external genitalia Resistant to testosterone	No	Yes	Normal male range	Normal	Normal	XY
Mullerian agenesis	Mutations in WNT4	Normal female genitalia Normal breast development	No	Yes	Normal female range	Normal	Normal	XX
Primary ovarian insufficiency	Genetic defects such as turner syndrome, fragile X syndrome, some other chromosomal defects	Normal female genitalia	Yes	Yes	Normal female range	↑	↑	XX
Hypogonadotropic hypogonadism	Functional, sellar masses	Normal female genitalia Delayed puberty	Yes	No	Normal female range	Low	Normal	XX
Turner syndrome	Chromosomal	Normal female external genitalia	Yes	Yes	Normal female range	↑	↑	45 XO

17 alpha-hydroxylase deficiency must be differentiated from diseases that cause ambiguous genitalia:

Disease name	Steroid status		Important clinical findings
	Increased	Decreased
Classic type of 21-hydroxylase deficiency	17-hydroxyprogesterone Progesterone Androstenedione DHEA	Aldosterone Corticosterone (salt-wasting) Cortisol (virilization)	Ambiguous genitalia in female Virilization in female Salt-wasting Hypotension and hyperkalemia
11-β hydroxylase deficiency	Deoxycorticosterone 11-Deoxy-cortisol 17-hydroxyprogesterone (mild elevation)	Cortisol Corticosterone Aldosterone	Ambiguous genitalia in female Hypertension and hypokalemia Virilization
17-α hydroxylase deficiency	Deoxycorticosterone Corticosterone Progesterone	Cortisol Aldosterone	Ambiguous genitalia in male Hypertension Primary amenorrhea Absence of secondary sexual characteristics Minimal body hair
3 beta-hydroxysteroid dehydrogenase deficiency	Dehydroepiandrosterone 17-hydroxypregnenolone Pregnenolone	Cortisol Aldosterone	Vomiting, volume depletion, hyponatremia, and hyperkalemia 46-XY infants often show undervirilization, due to a block in testosterone synthesis
Gestational hyperandrogenism	High maternal serum androgen concentrations (usually testosterone and androstenedione) If virilization is caused by exogenous hormone administration, the values may be low because the offending hormone is usually a synthetic steroid not measured in assays for testosterone or other androgens		Androgen excess in mother History of androgen containing medication consumption during pregnancy in mother Virilization in a 46,XX individual with normal female internal anatomy Causes include maternal luteoma or theca-lutein cysts, and placental aromatase enzyme deficiency

17 alpha-hydroxylase deficiency can cause low reninemic hypertension and should be differentiate from other causes of pseudohyperaldosteronism (low renin):

Pseudohyperaldosteronism causes	Disease	Etiology	Clinical features	Labratory				Treatment
				Elevated mineralocorticoid	Renin	Aldosterone	Other
Endogenous causes	17 alpha-hydroxylase deficiency	Mutations in the CYP17A1 gene	Ambiguous genitalia in male Hypertension Primary amenorrhea Absence of secondary sexual characteristics Minimal body hair	Deoxycorticosterone (DOC)	↓	↓	Cortisol ↓	Corticosteroids
	11β-hydroxylase deficiency	Mutations in the CYP11B1 gene	Ambiguous genitalia in female Hypertension and hypokalemia Virilization				Cortisol ↓
	Apparent mineralocorticoid excess syndrome (AME)	Genetic or acquired defect of 11-HSD gene Cortisone decreases and cortisol accumulates and binds to aldosterone receptors	Severe juvenile hypertension Hypercalciuria, nephrocalcinosis, polyuria (due to hypokalemia-induced nephrogenic diabetes insipidus) Renal failure	Cortisol has mineralocorticoid effects	↓	↓	Urinary free cortisone ↓↓	Dexamethasone and/or mineralocorticoid blockers
	Liddle’s syndrome (Pseudohyperaldosteronism type 1)	Mutation of the epithelial sodium channels (ENaC) gene in the distal renal tubules	Hypertension Hypokalemia	No extra mineralocorticoid presents, and mutations in Na channels mimic aldosterone mechanism	↓	↓	Cortisol ↓	Amiloride or triamterene
	Cushing’s syndrome	Excess cortisol which saturates 11-HSD2 activity Allows cortisol to bind mineralocorticoid receptor	Rapid weight gain, particularly of the trunk and face with limbs sparing (central obesity) Proximal muscle weakness A round face often referred to as a"moon face" Excess sweating Headache	Cortisol has mineralocorticoid effects	↓	↓ if excess cortisol saturates 11-HSD2 enzyme activity ↑ in direct activation of renin angiotensin system activation by glucocorticoids	Urinary free cortisol markedly ↑↑	Pasireotide, Cabergoline, Ketoconazole, and Metyrapone Adrenalectomy
	Insensitivity to glucocorticoids (Chrousos syndrome)	Mutations in glucocorticoid receptor (GR) gene	Hypertension Adrenal hyperandrogenism	Deoxycorticosterone (DOC)	↓	↓	Cortisol	Dexamethasone
	Cortisol-secreting adrenocortical carcinoma	Multifactorial	Rapid weight gain, particularly of the trunk and face with limbs sparing (central obesity) Proximal muscle weakness A round face often referred to as a "moon face" Excess sweating Headache	Cortisol has mineralocorticoid effects	↓	↓ if excess cortisol saturates 11-HSD2 enzyme activity ↑ in direct activation of renin angiotensin system activation by glucocorticoids	Urinary free cortisol markedly ↑↑	Surgery
	Geller’s syndrome	Mutation of mineralocorticoid (MR) receptor that alters its specificity and allows progesterone to bind MR	Severe hypertension particularly during pregnancy	Progesterone has mineralocorticoid effects	↓	↓	-	mineralocorticoid blockers
	Gordon’s syndrome (Pseudohypoaldosteronism type 2)	Mutations of at least four genes have been identified, including WNK1 and WNK4	Hypertension Hyperkalemia Normal renal function	No excess mineralocorticoid; an increased activity of the thiazide-sensitive Na–Cl co-transporter in the distal tubule	↓	Normal	Hyperkalemia	Thiazide diuretics and/or dietary sodium restriction
Exogenous causes	Corticosteroids with mineralocorticoid activity	Fludrocortisone or fluoroprednisolone can mimic the action of aldosterone	Hypertension Hypokalemia	Medications such as fludrocortisone	↓	↓	-	Change the treatment
	Licorice ingestion	Glycyrrhetinic acid that binds mineralocorticoid receptor and blocks 11-HSD2 at the level of classical target tissues of aldosterone	Hypertension Hypokalemia	-	↓	↓	Moderate ↑ in urinary free cortisol	Discontinue licorice
	Grapefruit	High assumption of naringenin, a component of grapefruit, can also block 11-HSD (11β-hydroxysteroid dehydrogenase)	Hypertension	-	↓	↓	-	Discontinue grapefruit
	Estrogens	Estrogens can retain sodium and water by different mechanisms, causing: Increased blood pressure values and suppressing the renin aldosterone system, on the other side inducing secondary hyperaldosteronism due to the stimulation of the synthesis of angiotensinogen	Hypertension Headache Edema Weight gain	-	↓	↓	-	Discontinue estrogens