Precocious Puberty

Definition

• Girls: before 8 years of age (some societies use 7 for white girls, 6 for Black girls as the cutoff for evaluation)
• Boys: before 9 years of age

The Lawson Wilkins Pediatric Endocrine Society guidelines specify that breast development or pubic hair in white girls before age 7, in Black girls before age 6, and in boys of all races before age 9 warrants evaluation. - Textbook of Family Medicine 9e

Classification

1. Central (Gonadotropin-Dependent) Precocious Puberty (CPP)

• Results from premature activation of the hypothalamic-pituitary-gonadal (HPG) axis
• LH and FSH are elevated (pulsatile GnRH secretion begins prematurely)
• Also called "true precocious puberty" or "isosexual precocity"

2. Peripheral (Gonadotropin-Independent) Precocious Puberty (PPP)

• Sex steroid secretion occurs independent of LH and FSH stimulation
• Also called "pseudo-precocious puberty"
• Low/suppressed LH with elevated sex steroids

3. Incomplete / Benign Variants

• Isolated premature thelarche - breast development only, no other signs; usually self-limited, especially in girls under 2 years
• Isolated premature pubarche/adrenarche - pubic hair only; usually self-limited
• Isolated premature menarche

Causes

Central Precocious Puberty (Gonadotropin-Dependent)

In boys with CPP, CNS disease accounts for ~two-thirds of cases. - Goldman-Cecil Medicine

Peripheral Precocious Puberty (Gonadotropin-Independent)

Epidemiology

• Precocious puberty is 20 times more common in girls than boys
• In girls, 90% of cases are idiopathic (central)
• In boys, ~10% are idiopathic; the majority have an identifiable organic cause (especially CNS)
• A secular trend toward earlier puberty onset has continued over the past century, partly due to improved nutrition and rising obesity rates - Harrison's 22E

Clinical Features

• Early development of secondary sexual characteristics (breasts, pubic/axillary hair, genital development)
• Accelerated linear growth and advanced bone age
• Risk of early epiphyseal closure leading to reduced adult height
• Psychosocial consequences (emotional immaturity combined with physical development)
• Long-term risks: increased risk of breast and endometrial cancer, cardiovascular disease, hypertension, type 2 diabetes, shorter life span

Diagnostic Evaluation

• Family and birth history; timing and tempo of pubertal development
• Neurologic symptoms; abdominal masses; skin lesions (cafe-au-lait spots suggest McCune-Albright)
• Assign Tanner stage

• Bone age (plain X-ray of left hand/wrist)
• Basal LH, FSH, and sex steroids (testosterone or estradiol)
• Thyroid function (TSH, T4)

Flow diagram for evaluation of precocious puberty - Berek & Novak's Gynecology

• MRI of brain/head to exclude CNS lesion
• If no lesion found → idiopathic CPP

• Measure DHEAS and 17α-hydroxyprogesterone
  • High 17-OHP → CAH (21-hydroxylase or 11β-hydroxylase deficiency)
  • High DHEAS → adrenal tumor (CT adrenals)
  • High testosterone without 17-OHP/DHEAS elevation → testicular palpation and ultrasound (Leydig cell tumor)
  • Consider activating LH receptor or Gα mutations if above excluded

Treatment

Central (Gonadotropin-Dependent) Precocious Puberty

• Leuprolide acetate - 3-month depot 11.25 mg or 30 mg; or 6-month depot 22.5 mg
• Triptorelin - 22.5 mg every 6 months (6-month depot)
• Suppress LH/FSH and sex steroids
• Halt pubertal progression, delay bone maturation, prevent early epiphyseal closure
• Most effective for height if initiated before age 6
• Puberty resumes after discontinuation
• No consensus on optimal age to stop; commonly around age 11-11.5 years

Peripheral (Gonadotropin-Independent) Precocious Puberty

Key Points Summary

Complications of Precocious Puberty

1. Short Stature (Most Important Physical Complication)

• Skeletal (bone) age is advanced relative to chronologic age
• Bone age is more closely correlated with pubertal stage than chronologic age during puberty; it is used with the Bayley-Pinneau tables to predict final adult height
• Treatment with GnRH analogues is most effective at preserving height if started before age 6
• Medroxyprogesterone acetate does not always prevent premature epiphyseal closure and resultant short stature
• GnRH analogues that reversibly inhibit gonadotropin secretion can prevent secondary sexual development and early epiphyseal fusion - Textbook of Family Medicine 9e

2. Long-Term Metabolic and Oncologic Risks

Earlier onset of puberty is associated with increased risk of breast and endometrial cancer, cardiovascular disease, hypertension, type 2 diabetes, hair pigmentation, and shorter life span. - Harrison's Principles of Internal Medicine 22E

3. Psychosocial and Behavioral Complications

• Emotional/behavioral immaturity - the child's psychological development does not match their physical appearance, creating significant internal and social conflict
• Social stigmatization - peers, strangers, and even family may treat the child according to their physical age rather than emotional age
• Depression and anxiety - documented consequence of premature physical development
• Sexual abuse vulnerability - physically developed girls are at higher risk
• Disrupted peer relationships - the child looks and is treated differently, leading to social isolation
• Prompt treatment can prevent or attenuate emotional consequences in the patient and her parents - Goldman-Cecil Medicine

4. Complications Specific to Underlying Causes

5. Reproductive Complications

• Menstrual irregularity in girls if the underlying axis is dysregulated - oligomenorrhea, dysfunctional uterine bleeding
• In the Robbins Pathology tables, precocious puberty (hypothalamic, pituitary, or ovarian origin) is listed as a cause of abnormal uterine bleeding in the prepubertal period - Robbins & Kumar Basic Pathology

Summary Table

Complications of Varicose Veins Surgery

A. Complications of Open Surgery (Ligation and Stripping)

1. Wound Complications

• Wound infection - the most common complication overall; reduced by prophylactic antibiotics
• Haematoma - blood collection at the groin incision or along the stripping tract; common due to the large tissue plane created
• Ecchymosis (bruising) - almost universal along the stripping tunnel
• Lymphocele / lymph leak - damage to lymphatic vessels in the groin, especially common in redo surgery (up to 40% complication rate in recurrent varicose vein surgery, with lymph leak and wound infection being most frequent)

2. Nerve Injury - Most Common Serious Complication

• The saphenous nerve runs close to the GSV in the calf (less separation than in the thigh) - this anatomical detail explains why stripping is generally limited to the thigh, not below the knee
• Stripping of the GSV below the knee and stripping of the SSV are generally avoided because of the respective saphenous and sural nerve injury risks

3. Vascular / Thromboembolic

• Deep vein thrombosis (DVT) - incidence approximately 0.5% after varicose vein surgery; patient-specific risk must be assessed and prophylaxis given per guidelines
• Pulmonary embolism - rare but life-threatening consequence of DVT
• Bleeding / haemorrhage - from inadequate ligation of tributaries or venous perforators
• Inadvertent arterial injury - very rare; femoral artery damage at groin dissection

4. Lymphatic

• Lymphoedema - disruption of inguinal lymphatics at groin exploration
• Lymph fistula / chronic lymph leak - persistent drainage, especially in redo cases

B. Complications Specific to Endovenous Thermal Ablation (Laser / Radiofrequency)

• DVT of the common femoral vein adjacent to the saphenofemoral junction - uncommon but important
• Pain and paresthesias along the ablated vein tract
• Bruising / ecchymosis and haematoma
• Hyperpigmentation of the overlying skin
• Saphenous nerve injury - heat injury to the nerve running alongside the GSV
• Skin burns - from inadequate tumescent anaesthesia (which insulates the skin from thermal injury)
• Endovenous heat-induced thrombus (EHIT) - thrombus extending from the treated segment into the deep system

C. Complications of Sclerotherapy

• Allergic reaction / anaphylaxis - rare but potentially severe
• Local hyperpigmentation - brown staining of skin over treated vessels; may be permanent
• Superficial thrombophlebitis - inflammation of the sclerosed vein
• Deep vein thrombosis
• Skin necrosis - if sclerosant leaks perivascularly (extravasation) or if concentrated solution is used
• Nerve injury - damage to adjacent saphenous or sural nerves
• Embolisation - with foam sclerotherapy, gas emboli can rarely pass to the systemic circulation (including cerebral, especially in patients with patent foramen ovale)
• Infection

D. Recurrence - A Major Long-Term Complication

1. Neovascularisation - new valveless veins grow across the ligated junction; most common cause
2. Reflux in residual axial vein - incomplete stripping
3. Inadequate initial surgery - missed junctions or perforators
4. New junctional reflux - at sites not originally diseased

• Recurrence is more common after SSV surgery than GSV surgery, and in patients with high BMI
• Stripping of the incompetent axial vein reduces recurrence compared to ligation alone
• Endovenous thermal ablation may have lower recurrence rates than open surgery

E. General Surgical Complications

• General anaesthesia risks (open surgery is performed under GA)
• Scar formation at groin and calf incision sites
• Venous thromboembolism (VTE) - risk increases with prolonged operative time or patient immobility

Summary Table

Why Stripping of the Great Saphenous Vein (GSV) is Avoided Below the Knee

The Anatomy - The Key Explanation

1. Enters the adductor canal in the thigh alongside the femoral vessels - here it has significant separation from the GSV
2. Exits through the vastoabductor membrane and passes toward the medial aspect of the knee
3. Below the knee, it leaves the subfascial plane and travels in the same fascial tunnel as the GSV - closely bound to the vein in the same plane
4. It then follows the GSV all the way down to the medial leg and foot

"The saphenous nerve runs close to the GSV in the calf compared with the thigh, where the nerve and vein have more separation. This anatomic detail may explain why stripping from the knee to the thigh only reduces the risk of nerve injury." - Sabiston Textbook of Surgery

"Iatrogenic saphenous nerve injury is a well-known complication following great saphenous vein total stripping. This is due to the course of the nerve as it follows the vein distally in the same plane and closely bound to the vein below the knee." - Imaging Anatomy Atlas, Vol. 3

What Happens During Stripping Below the Knee

• Saphenous nerve neuralgia - painful dysesthesia along the medial leg/foot
• Hypoesthesia or numbness over the medial leg and medial border of the foot
• Paresthesias (tingling, burning) in the distribution of the nerve
• Incidence: up to 7% when stripped to the knee; significantly higher when stripped to the ankle

The Same Principle Applies to the Small Saphenous Vein (SSV)

• Up to 20% incidence of sural nerve neuropraxia
• Sural nerve injury causes numbness/paresthesia over the lateral foot and 5th toe

Practical Surgical Implication

"Stripping of the great saphenous vein below the knee and stripping of the small saphenous vein usually are not performed because of the respective risks of saphenous and sural nerve injury." - Harrison's Principles of Internal Medicine 22E

Why This Matters Less with Endovenous Techniques

• The catheter is introduced percutaneously and stays within the vein lumen - no mechanical avulsion of surrounding tissue
• Tumescent anaesthesia injected around the saphenous compartment acts as a heat sink and provides some physical separation/protection of the nerve from thermal injury
• The nerve is not dragged or torn - only the vein wall itself is damaged by heat