Precocious Puberty is the development of secondary sexual characteristics before the age of 8 in females, and 9 in males. The first sign of early puberty in males is testicular enlargement, followed by growth of the penis and the scrotum at least a year after. Precocious puberty in boys in uncommon and usually has an organic cause leading to excess secretion of testosterone. These can be gonadotrophin dependent in the case of an inter cranial lesion, where the testes would be bilaterally enlarged, or from excess production from the adrenal gland in the case of adrenal hyperplasia or a tumour.

Congenital adrenal hyperplasia is a common cause of virilisation in females that can present as ambiguous genitalia at birth. Deficiency of the 21-alphahydroxylase enzyme is implicated in excess mineralocorticoid and androgens produced by the adrenal gland. Virilisation occurs when excess androgens are converted to testosterone in a genetically female foetus, causing the genitalia to resemble male genitalia. A deficiency of 5-alpha hydroxylase would rather decrease the production of testosterone and lead to the presentation of external female genitalia in a genetically male foetus. Autoantibodies against glutamic acid are seen in type 1 diabetes mellitus, while defects in the AIRE gene and the FOXP3 affect components of the immune system.

A bone age study helps doctors estimate the maturity of a child’s skeletal system. It’s usually done by taking a single X-ray of the left wrist, hand, and fingers. It is a safe and painless procedure that uses a small amount of radiation. The bones on the X-ray image are compared with X-rays images in a standard atlas of bone development, which is based on data from large numbers of other kids of the same gender and age. The bone age is measured in years.

Diabetes insipidus (DI) is defined as the passage of large volumes (>3 L/24 hr) of dilute urine (< 300 mOsm/kg). It has the following 2 major forms:Central (neurogenic, pituitary, or neurohypophyseal) DI, characterized by decreased secretion of antidiuretic hormone (ADH| also referred to as arginine vasopressin [AVP])Nephrogenic DI, characterized by decreased ability to concentrate urine because of resistance to ADH action in the kidney.The boy most probably has nephrogenic diabetes insidious (DI) not central DI so he is not responding to the ADH treatment.

Puberty is the general term for the transition from sexual immaturity to sexual maturity. There are two main physiological events in puberty:- Gonadarche is the activation of the gonads by the pituitary hormones follicle-stimulating hormone (FSH) and luteinizing hormone (LH).- Adrenarche is the increase in production of androgens by the adrenal cortex. It is the term for the maturational increase in adrenal androgen production that normally becomes biochemically apparent at approximately six years of age in both girls and boysA number of other terms describe specific components of puberty:- Thelarche is the appearance of breast tissue, which is primarily due to the action of oestradiol from the ovaries. – Menarche is the time of first menstrual bleed. – Pubarche is the appearance of pubic hair, which is primarily due to the effects of androgens from the adrenal gland. The term is also applied to first appearance of axillary hair, apocrine body odour, and acne.The earliest detectable secondary sexual characteristic on physical examination in most girls is breast/areolar development (thelarche). Ovarian enlargement and growth acceleration typically precede breast development but are not apparent on a single physical examination. Oestrogen stimulation of the vaginal mucosa causes a physiologic leukorrhea, which is a thin, white, non-foul-smelling vaginal discharge that typically begins 6 to 12 months before menarche. Menarche occurs, on average, 2 to 2.5 years after the onset of puberty

Addison disease is adrenocortical insufficiency due to the destruction or dysfunction of the entire adrenal cortex. It affects glucocorticoid and mineralocorticoid function. The onset of disease usually occurs when 90% or more of both adrenal cortices are dysfunctional. The most common symptoms are fatigue, muscle weakness, loss of appetite, weight loss, and abdominal pain. Adrenal insufficiency can be caused by autoimmune disease or suddenly stopping steroid medicines used to treat other conditions, among other causes.

Puberty is when a child’s body begins to develop and change as they become an adult.The average age for girls to begin puberty is 11, while for boys the average age is 12.It’s completely normal for puberty to begin at any point from the ages of 8 to 14. The process can take up to 4 years.

The most probable diagnosis for this boy is primary hypothyroidism.Rationale:The development of secondary sexual characteristics in a boy aged less than 9 years of age is highly suggestive of precocious puberty.Around 80% of boys with precocious puberty have pathological causes and require detailed investigation. In this case, the child has long-standing short stature but coupled with the early puberty and delay in bone age, the diagnosis is primary hypothyroidism, which is the only cause of this clinical picture.

Noonan syndrome is a condition that affects many areas of the body. It is characterized by mildly unusual facial features, short stature, heart defects, bleeding problems, skeletal malformations, and many other signs and symptoms.People with Noonan syndrome have distinctive facial features such as a deep groove in the area between the nose and mouth (philtrum), widely spaced eyes that are usually pale blue or blue-green in colour, and low-set ears that are rotated backwards. Affected individuals may have a high-arched palate, poor teeth alignment, and micrognathia. Many children with Noonan syndrome have a short neck, and both children and adults may have excess neck skin (also called webbing) and a low hairline at the back of the neck.Between 50 and 70 % of individuals with Noonan syndrome have short stature. At birth, they are usually a normal length and weight, but growth slows over time. Individuals with Noonan syndrome often have either a pectus excavatum or pectus carinatum. Some affected people may also have scoliosis.Most people with Noonan syndrome have some form of critical congenital heart disease. The most common heart defect in these individuals is pulmonary valve stenosis. Some have hypertrophic cardiomyopathy.A variety of bleeding disorders have been associated with Noonan syndrome. Some affected individuals have excessive bruising, nosebleeds, or prolonged bleeding following injury or surgery. Rarely, women with Noonan syndrome who have a bleeding disorder have excessive bleeding during menstruation (menorrhagia) or childbirth.Adolescent males with Noonan syndrome typically experience delayed puberty. They go through puberty starting at age 13 or 14 and have a reduced pubertal growth spurt that results in shortened stature. Most males with Noonan syndrome have undescended testes (cryptorchidism), which may contribute to infertility (inability to father a child) later in life. Females with Noonan syndrome can experience delayed puberty but most have normal puberty and fertility.Most children diagnosed with Noonan syndrome have normal intelligence, but a few have special educational needs, and some have an intellectual disability. Some affected individuals have vision or hearing problems. It has been estimated that children with Noonan syndrome have an eightfold increased risk of developing leukaemia or other cancers over age-matched peers.

Fragile X syndrome is a genetic condition that causes a range of developmental problems including learning disabilities and cognitive impairment. Usually, males are more severely affected by this disorder than females.Affected individuals usually have delayed development of speech and language by age 2. Most males with fragile X syndrome have mild to moderate intellectual disability, while about one-third of affected females are intellectually disabled. Children with fragile X syndrome may also have anxiety and hyperactive behaviour such as fidgeting or impulsive actions. They may have attention deficit disorder (ADD), which includes an impaired ability to maintain attention and difficulty focusing on specific tasks. About one-third of individuals with fragile X syndrome have features of autism spectrum disorder that affect communication and social interaction. Seizures occur in about 15 percent of males and about 5 percent of females with fragile X syndrome.Most males and about half of females with fragile X syndrome have characteristic physical features that become more apparent with age. These features include a long and narrow face, large ears, a prominent jaw and forehead, unusually flexible fingers, flat feet, and in males, enlarged testicles (macroorchidism) after puberty.

Tanner stage two presents with the following: Downy hair, Breast bud palpable under areola (1st pubertal sign in females).Stage 1 (prepubertal) – elevation of papilla only – no pubic hairStage 2 – breast bud forms – sparse, slightly pigmented hair on labia majoraStage 3 – Breast begins to become elevated, extends beyond areola borders – hair becomes more coarse and curlyStage 4 – increased size and elevation. Areola and papilla form secondary mound – adult like, but sparing medial thighsStage 5 – final size, areola returns but papilla remains projected – hair extends to medial thighs

Congenital hypothyroidism is associated with failure to thrive, macroglossia, prolonged jaundice of a new-born and constipation.

Lypohypertrophy is the most common skin-related complication of insulin injection.

Turners syndrome is a chromosomal syndrome affecting the development of females. In this condition, all or part of the X chromosome gets deleted, producing the Karyotype 45 XO or 45XO/46XX. Spontaneous foetal loss is common in the first trimester, but foetuses which survive are born small for date, and may have lymphedema, and poor feeding in the neonatal period. These patients face numerous medical and developmental problems throughout their lifetimes including growth and puberty failure due to premature ovarian failure/ hypergonadotropic hypogonadism. However spontaneous puberty can be seen in up to 20% of females with Turner’s syndrome.

The pituitary gland synthesizes and releases various hormones that affect several organs throughout the body.The pituitary gland is entirely ectodermal in origin but is composed of 2 functionally distinct structures that differ in embryologic development and anatomy: the adenohypophysis (anterior pituitary) and the neurohypophysis (posterior pituitary).The anterior pituitary has three main regions:Pars distalis: Where the main hormone production occursPars tuberalis: Joins the pituitary stalk arising from the posterior pituitary glandPars intermedia: Divides the anterior and posterior parts of the pituitary gland. The pars distalis forms the majority of the adenohypophysis and resembles a typical endocrine gland.

The average age for girls to begin puberty is 11.The first sign of puberty in girls is usually that their breasts begin to develop.It’s normal for breast buds to sometimes be very tender or for one breast to start to develop several months before the other one.Pubic hair also starts to grow, and some girls may notice more hair on their legs and arms.After a year or so of puberty beginning, and for the next couple of years:girls’ breasts continue to grow and become fuller.Around 2 years after beginning puberty, girls usually have their first period,pubic hair becomes coarser and curlierunderarm hair begins to grow. From the time their periods start, girls grow 5 to 7.5cm (2 to 3 inches) annually over the next year or two, then reach their adult height.After about 4 years of puberty in girls:breasts become adult-likepubic hair has spread to the inner thighgenitals should now be fully developedgirls stop growing taller.

The thymus is a lymphoid organ located in the anterior mediastinum. In early life, the thymus is responsible for the development and maturation of cell-mediated immunologic functions. The thymus is composed predominantly of epithelial cells and lymphocytes. Precursor cells migrate to the thymus and differentiate into lymphocytes. Most of these lymphocytes are destroyed, with the remainder of these cells migrating to tissues to become T cells.DiGeorge’s syndrome (DGS) is a developmental abnormality affecting the thymus. The classic triad of features of DGS on presentation is conotruncal cardiac anomalies, hypoplastic thymus, and hypocalcaemia (resulting from parathyroid hypoplasia).

The main cause of growth hormone (GH) deficiency is a pituitary tumour or the consequences of treatment of the tumour including surgery and/or radiation therapy.Sheehan’s syndrome (SS) is postpartum hypopituitarism caused by necrosis of the pituitary gland. It is usually the result of severe hypotension or shock caused by massive haemorrhage during or after delivery. Patients with SS have varying degrees of anterior pituitary hormone deficiency.Laron syndrome is Insulin-like growth factor I (IGF-I) deficiency due to GH resistance or insensitivity due to genetic disorders of the GH receptor causing GH receptor deficiency.

The first sign of pubarche in females is breast-bud development (thelarche).This begins between the ages of 9 and 12 years and continues to 12–18 years. Pubic hair growth occurs next (said to occur in stage 3), at ages 9–14 years, and is complete at 12–16 years. Menarche occurs relatively late in stage 4 (age 11–15 years) and is associated with a deceleration in growth. The peak height velocity is reached earlier (10–13 years) and growth is completed much earlier than in boys.

Adrenal insufficiency is a serious medical condition that leads to inadequate secretion of corticosteroids. The consequences of this deficiency are numerous electrolyte and acid-base imbalances, which include hyponatremia, hyperkalaemia, hypercalcemia, hypoglycaemia, metabolic alkalosis, and dehydration.

While the clinical scenario and the anosmic presentation of the child are highly suggestive of Kallmann’s syndrome, reduced testosterone, FSH and LH levels can confirm the diagnosis.Kallman’s syndrome is a recognised cause of delayed puberty secondary to hypogonadotropic hypogonadism. It is usually inherited as an X-linked recessive trait. Kallman’s syndrome is thought to be caused by a failure of GnRH-secreting neurons to migrate to the hypothalamus.Clinical features of Kallmann’s syndrome include:- Delayed puberty- Hypogonadism, cryptorchidism- Anosmia- Low sex hormone levels – Inappropriately low/normal LH and FSH levels- Some patients can present with associated cleft lip/palate and visual/hearing defects.

Bone age is a valuable tool for determining the skeletal maturation in children. An X-ray of the left hand and wrist or knee is used to calculate bone age, which is then compared with the chronological age of the subject to know if the bone age is advanced or delayed. Certain standardized methods are used to score skeletal maturity, the most common methods are the Tanner-Whitehouse (TW) and Greulich-Pyle (GP) methods. The growth plate comprises a resting zone, a proliferative zone, hypertrophic cartilage zone, calcified cartilage zone, and then the ossification zone. This is the zonal distribution from the epiphysis to the diaphysis. After the closure of growth plates, spinal growth still occurs to some extent, adding up to the final height. The growth plates in boys close at around 17 to 19 years of age, while in girls, they close at around 13 to 15 years.

Multiple endocrine neoplasia type 1 is a rare, autosomal dominant disorder characterized by a higher propensity to develop various endocrine and nonendocrine tumours. The primary endocrine tumours that are a part of this disorder include carcinoid tumours and tumours of parathyroid, enteropancreatic, and anterior pituitary origin. Carcinoid tumours encountered in MEN type 1 are mostly of the foregut region. Non-endocrine tumours found in MEN type 1 include meningiomas and ependymomas, lipomas, angiofibromas, collagenomas, and leiomyomas. The pathogenesis of MEN type 1 is the inactivating mutation of the tumour suppressor gene MEN 1, which encodes the protein menin.

Deficiency of 21-hydroxylase, resulting from mutations or deletions of CYP21A, is the most common form of Congenital Adrenal Hyperplasia, accounting for more than 90% of cases.Females with mild 21-hydroxylase deficiency are identified later in childhood because of precocious pubic hair, clitoromegaly, or both, often accompanied by accelerated growth and skeletal maturation (simple virilizing adrenal hyperplasia)Diagnosis of 21-hydroxylase deficiency: High serum concentration of 17-hydroxyprogesterone (usually >1000 ng/dL) and urinary pregnanetriol (metabolite of 17-hydroxyprogesterone) in the presence of clinical features suggestive of the disease| 24-hour urinary 17-ketosteroid levels are elevated

Craniopharyngiomas (also known as Rathke pouch tumours, adamantinomas or hypophyseal duct tumours) affect children mainly between the age of 5 and 10 years. It constitutes 9% of brain tumours affecting the paediatric population. These are slow-growing tumours which can also be cystic, and arise from the pituitary stalk, specifically the nests of epithelium derived from Rathke’s pouch. Histologically, this tumour shows nests of squamous epithelium which is lined on the outside by radially arranged cells. Calcium deposition is often seen with a papillary type of architecture.
ACTH-secreting pituitary adenomas are rare and mostly microadenomas. Paediatric astrocytoma’s usually occur in the posterior fossa. Although null cell adenomas can cause mass effect and give rise to the described symptoms, they are not suprasellar. Prolactinomas can also show symptoms of headache and disturbances in the visual field, however they are known to be small and slow-growing.

Metformin works by improving the sensitivity of peripheral tissues to insulin, which results in a reduction of circulating insulin levels. Metformin inhibits hepatic gluconeogenesis and it also increases the glucose uptake by peripheral tissues and reduces fatty acid oxidation. Metformin has a positive effect on the endothelium and adipose tissue independent of its action on insulin and glucose levels.Metformin was the first insulin sensitising drug (ISD) to be used in PCOS to investigate the role of insulin resistance in the pathogenesis of the syndrome Several effects have been reported as related to metformin in PCOS patients including restoring ovulation, reducing weight, reducing circulating androgen levels, reducing the risk of miscarriage and reducing the risk of gestational diabetes mellitus (GDM). Other studies have reported that the addition of metformin to the ovarian stimulation regime in invitro fertilization (IVF) improves the pregnancy outcome. These effects will be addressed individually.

The child has experienced the Somogyi phenomenon. It is a phenomenon where there’s a morning rise in blood sugar. Often it occurs as posthypoglycemic hyperglycaemia and follows nocturnal hypoglycaemia. The mechanism is the production of counter-regulatory hormones like glucagon, cortisol and adrenaline, which increase glucose. She can be managed by reducing her evening insulin dosage and increasing complex carbohydrates for supper (evening meal).Type I diabetes mellitus:It is a chronic illness that is characterised by the inability to produce insulin. It is caused by autoimmune destruction of the beta cells in the pancreas and often presents with ketoacidosis.The patient can present with symptoms suggestive of polyuria, polydipsia, and weight loss. There can be periods of islet cell regeneration in these patients, which leads to a ‘honeymoon period’ of remission.Symptoms occur when there is < 20% of islet cell activity left.Insulin therapy is required in almost all children with type 1 diabetes.Most children require multiple insulin injections throughout the day via subcutaneous insulin pumps.Target HbA1c in these patients is 48 mmol/mol according to the updated NICE guidelines.

Adrenal insufficiency is a serious medical condition that leads to inadequate secretion of corticosteroids. There are three main types of adrenal insufficiency: primary, secondary, and tertiary, based on the location of the abnormality. Primary adrenal insufficiency is caused by any pathology located inside the adrenal glands. The most common cause of primary adrenal insufficiency is Addison’s disease, which is an autoimmune condition. Adrenoleukodystrophy is an X-linked neurodegenerative disease that also causes primary adrenal insufficiency. Secondary adrenal insufficiency is caused by any pathological impairment of the pituitary gland or the hypothalamus. The important causes of secondary adrenal insufficiency include iatrogenic (steroid use), pituitary tumours like craniopharyngioma, and conditions leading to panhypopituitarism like Sheehan’s syndrome. Tertiary adrenal insufficiency is caused by the deficiency of the corticotropin-releasing hormone. Hypoparathyroidism does not cause adrenal insufficiency.

Puberty is a period of transitioning into adulthood by developing full reproductive potential by undergoing drastic physiological and psychological changes. For boys, it occurs around 9-16 years of age typically. The process of pubertal changes is usually divided into stages called tanner’s stages. The physiologic changes of puberty are initiated by the release of gonadotropin-releasing hormones from the hypothalamus, which then interact with numerous endogenous and environmental stimuli to bring about the physical pubertal features. Tanner stage 2 in boys is characterized by the thinning and reddening of the scrotal skin.The growth spurt of around 9cm per year is expected in boys, at the peak velocity.Testicular enlargement of >3cm commences puberty.Pubarche, in the absence of other secondary sexual characteristics, is pathological.Adrenarche is the increase in the secretion of adrenal androgens, occurring prior to increased gonadotropin release.

Hypercalcemia refers to increased serum calcium levels and is characterized by a number of significant constellations, including polyuria, muscle weakness, abdominal pain, fatigue, and cardiac arrhythmias. The causes of hypercalcemia can be classified as PTH-dependant causes and PTH-independent causes. The causes can be both congenital and acquired. The most common cause of PTH-dependent hypercalcemia is the primary or tertiary hyperparathyroidism, resulting from parathyroid gland tumours. Hyperparathyroidism is also associated with chronic renal failure. PTH-independent hypercalcemia is caused by William’s syndrome, hypervitaminosis (vitamin A and D intoxication), endocrinopathies (hyperthyroidism), various drugs (thiazide diuretics), and some inborn errors of metabolism. One of the congenital causes of PTH-independent hypercalcemia is idiopathic infantile hypercalcemia.