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PubMed This is a summary of 21 peer-reviewed journal articles Updated
Endocrinology

The Biology of CPHD: Blueprints and Brain Anatomy

At a Glance

Combined Pituitary Hormone Deficiency (CPHD) is often caused by structural differences or genetic mutations present before birth. Conditions like Pituitary Stalk Interruption Syndrome and Septo-optic Dysplasia disrupt how the pituitary gland develops and communicates with the brain.

To understand Combined Pituitary Hormone Deficiency (CPHD), it helps to look at the “blueprint” and the “construction” of the brain. CPHD is not just about missing hormones; it is often about how the pituitary gland was built and connected before birth.

The Master Gland and Its Bridge

The pituitary gland is the “master gland” of the body. It sits in a small bony pocket at the base of the brain and receives signals from the brain to release hormones that control growth, energy, and development [1][2].

The brain communicates with this gland through a thin “bridge” called the pituitary stalk [2][3]. In some children with CPHD, this bridge did not form correctly. This is called Pituitary Stalk Interruption Syndrome (PSIS) [4][5]. When the bridge is thin or missing, the brain’s signals cannot reach the gland effectively, leading to hormone shortages [6][7].

The Blueprint: Genes and Transcription Factors

Think of your child’s DNA as a set of instructions. Certain genes, called transcription factors, act like “architectural blueprints” or “master builders” [3][8]. Their job is to tell the body exactly how to build the pituitary gland and which cells should make which hormones [1][9].

If there is a change (mutation) in one of these blueprints, the gland may not develop fully:

  • PROP1 and POU1F1: These are common “builders.” If they aren’t working, the gland may be small and fail to produce several hormones, such as growth hormone and thyroid-stimulating hormone [1][10].
  • HESX1, LHX3, and LHX4: These genes are involved very early in development. Mutations here can affect the gland’s structure and sometimes the surrounding parts of the brain or even the neck and spine [1][11].

Identifying a specific “blueprint error” through genetic testing is also helpful for family planning, as some of these gene mutations can be inherited and may affect future pregnancies [12][13].

CPHD as Part of a Syndrome

Sometimes, CPHD occurs alongside other developmental differences in the brain. The most common is Septo-optic Dysplasia (SOD) [9][14]. SOD is a “spectrum” condition, meaning it affects every child differently, but it typically involves at least two of these three features:

  1. Pituitary Hormone Abnormalities: The hormone deficiencies seen in CPHD [9][15].
  2. Optic Nerve Hypoplasia: The nerves connecting the eyes to the brain are smaller than usual, which can affect vision [9][16].
  3. Midline Brain Defects: Differences in the structure of the center of the brain, such as a missing septum pellucidum (a thin membrane in the middle of the brain) [9][17].

Why an MRI is Important

Because CPHD can involve these structural differences, your doctor will likely order an MRI (Magnetic Resonance Imaging) [16][2]. This scan allows the medical team to see the “architecture” of the pituitary gland, the stalk, and the optic nerves [18][19]. Understanding whether the issue is a “blueprint” error (genetic) or a “construction” error (structural) helps your care team monitor your child’s health more effectively as they grow [20][21].

Common questions in this guide

What is Pituitary Stalk Interruption Syndrome (PSIS)?
PSIS occurs when the pituitary stalk, the bridge connecting the brain to the pituitary gland, does not form correctly. If this stalk is thin or missing, the brain's signals cannot effectively reach the gland, resulting in hormone shortages.
How do genetics cause Combined Pituitary Hormone Deficiency?
Genetic mutations in transcription factors like PROP1 and POU1F1 can cause CPHD. These genes act as blueprints instructing the body how to build the pituitary gland, and mutations can prevent the gland from developing or functioning properly.
What is Septo-optic Dysplasia (SOD)?
Septo-optic Dysplasia is a developmental condition that often occurs alongside CPHD. It typically involves a combination of pituitary hormone abnormalities, underdeveloped optic nerves affecting vision, and differences in the midline structures of the brain.
Why is an MRI necessary for a child with CPHD?
An MRI allows doctors to see the physical architecture of your child's brain, pituitary gland, and optic nerves. This scan reveals whether the hormone deficiency is due to structural errors, helping the care team monitor their health as they grow.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Was my child's pituitary stalk visible on the MRI, or is it thin or absent (Pituitary Stalk Interruption Syndrome)?
  2. 2.Does my child have any 'midline defects' in their brain, such as a missing septum pellucidum?
  3. 3.Have my child's optic nerves been checked by an ophthalmologist to rule out Septo-optic Dysplasia (SOD)?
  4. 4.Based on my child's MRI, which hormones are most likely to become deficient in the future?
  5. 5.If we identify a specific gene mutation (like PROP1), what does that tell us about the long-term prognosis for other hormones?

Questions For You

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References

References (21)
  1. 1

    Pituitary Hypoplasia.

    Gangat M, Radovick S

    Endocrinology and metabolism clinics of North America 2017; (46(2)):247-257 doi:10.1016/j.ecl.2017.01.003.

    PMID: 28476222
  2. 2

    Missing Pituitary Stalk: A Key to the Diagnosis.

    Iranpour P, Haseli S

    Iranian journal of medical sciences 2020; (45(3)):224-225 doi:10.30476/ijms.2020.82182.1005.

    PMID: 32546890
  3. 3

    Occurrence of Hypopituitarism in Tunisian Turner Syndrome patients: familial versus sporadic cases.

    Mnif-Feki M, Safi W, Bougacha-Elleuch N, et al.

    Gynecological endocrinology : the official journal of the International Society of Gynecological Endocrinology 2021; (37(9)):848-852 doi:10.1080/09513590.2021.1939298.

    PMID: 34124982
  4. 4

    A case report of Culler-Jones syndrome with deafness carrying a novel mutation in GLI2 gene.

    Yuan X, Chu S, Gu W

    BMC pediatrics 2025; (25(1)):878 doi:10.1186/s12887-025-06135-0.

    PMID: 41152794
  5. 5

    Dorsoventral splitting of the infundibulum in a child with pituitary hypoplasia.

    Welby JP, Madhavan AA, Campeau NG, et al.

    Radiology case reports 2023; (18(8)):2754-2757 doi:10.1016/j.radcr.2023.05.038.

    PMID: 37334326
  6. 6

    Clinical Symptoms and Magnetic Resonance Imaging Findings in Patients with Pituitary Stalk Interruption Syndrome.

    Gardijan D, Pavlisa G, Galkowski V

    Klinische Padiatrie 2021; (233(2)):83-87 doi:10.1055/a-1288-9888.

    PMID: 33167044
  7. 7

    Pituitary Stalk Interruption Syndrome from Infancy to Adulthood: Clinical, Hormonal, and Radiological Assessment According to the Initial Presentation.

    Bar C, Zadro C, Diene G, et al.

    PloS one 2015; (10(11)):e0142354 doi:10.1371/journal.pone.0142354.

    PMID: 26562670
  8. 8

    Pituitary Transcription Factor Mutations Leading to Hypopituitarism.

    Gergics P

    Experientia supplementum (2012) 2019; (111()):263-298 doi:10.1007/978-3-030-25905-1_13.

    PMID: 31588536
  9. 9

    Septo-optic dysplasia plus diagnosed in adulthood.

    Infante-Valenzuela A, Camara-Lemarroy CR, Reyes-Mondragon AL, et al.

    Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology 2017; (38(9)):1705-1707 doi:10.1007/s10072-017-2985-7.

    PMID: 28474147
  10. 10

    Identification of a Novel PROP1 Mutation in a Patient with Combined Pituitary Hormone Deficiency and Enlarged Pituitary.

    Penta L, Bizzarri C, Panichi M, et al.

    International journal of molecular sciences 2019; (20(8)) doi:10.3390/ijms20081875.

    PMID: 30988269
  11. 11

    HESX1 mutations in patients with congenital hypopituitarism: variable phenotypes with the same genotype.

    Fang Q, Benedetti AF, Ma Q, et al.

    Clinical endocrinology 2016; (85(3)):408-14 doi:10.1111/cen.13067.

    PMID: 27000987
  12. 12

    Molecular analysis of brazilian patients with combined pituitary hormone deficiency and orthotopic posterior pituitary lobe reveals eight different PROP1 alterations with three novel mutations.

    Madeira JL, Nishi MY, Nakaguma M, et al.

    Clinical endocrinology 2017; (87(6)):725-732 doi:10.1111/cen.13430.

    PMID: 28734020
  13. 13

    A Novel Missense Variant in LHX4 in Three Children with Multiple Pituitary Hormone Deficiency Belonging to Two Unrelated Families and Contribution of Additional GLI2 and IGFR1 Variant.

    Santoro C, Aiello F, Farina A, et al.

    Children (Basel, Switzerland) 2025; (12(3)) doi:10.3390/children12030364.

    PMID: 40150646
  14. 14

    The clinical aspects of septo-optic dysplasia: A narrative review with illustrative case report.

    Al-Salihi MM, Qassim T, Aji N, et al.

    International journal of surgery case reports 2023; (109()):108575 doi:10.1016/j.ijscr.2023.108575.

    PMID: 37524018
  15. 15

    Prenatal diagnosis of isolated agenesis of the septum pellucidum with ultrasound and magnetic resonance imaging

    Nemcsik-Bencze Z, Várbíró S, Rudas G, Nemcsik J

    Orvosi hetilap 2020; (161(52)):2195-2200 doi:10.1556/650.2020.31912.

    PMID: 33361505
  16. 16

    Septo-optic Dysplasia with Cerebellar Hemiagenesis.

    Parry AH, Wani AH

    Journal of pediatric neurosciences 2020; (15(3)):328-329 doi:10.4103/jpn.JPN_93_18.

    PMID: 33531961
  17. 17

    Septo-optic dysplasia with amniotic band syndrome sequence: a case report.

    Amiji IA, Mohamed UH, Rutashobya AG, et al.

    Journal of medical case reports 2019; (13(1)):370 doi:10.1186/s13256-019-2306-2.

    PMID: 31839004
  18. 18

    Abnormal thyroid function: an unusual presentation of pituitary stalk interruption syndrome.

    Steen EA, Patterson ME, Rivera-Vega M, Phillips SA

    Endocrinology, diabetes & metabolism case reports 2023; (2023(2)).

    PMID: 37183887
  19. 19

    Two Cases of Late Diagnosis Pituitary Stalk Interruption Syndrome and Literature Review.

    Alkhalifa M, Alsalman Z, Al Elq A, et al.

    International medical case reports journal 2025; (18()):345-354 doi:10.2147/IMCRJ.S507989.

    PMID: 40129560
  20. 20

    Delayed Diagnosis of Congenital Combined Pituitary Hormone Deficiency including Severe Growth Hormone Deficiency in Children with Persistent Neonatal Hypoglycemia-Case Reports and Review.

    Smyczyńska J, Pawelak N, Hilczer M, Lewiński A

    International journal of molecular sciences 2022; (23(19)) doi:10.3390/ijms231911069.

    PMID: 36232371
  21. 21

    Identification of POU1F1 Variants in Vietnamese Patients with Combined Pituitary Hormone Deficiency.

    Nguyen HT, Nguyen KN, Dien TM, et al.

    International journal of molecular sciences 2025; (26(6)) doi:10.3390/ijms26062406.

    PMID: 40141050

This page provides educational information about the biology and structural causes of CPHD in children. Always consult your pediatric endocrinologist for interpretations of MRI scans and genetic test results.

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