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Zorluk: KolayPediatric Endocrine Disorders

A 77-year-old female patient is seen in the pediatric endocrinology office for an evaluation of early physical maturation. The parents first noticed the development of breast tissue about 88 months ago. Recently, she has outgrown her clothes much faster than her peers. On physical examination, her height is at the 9595 th percentile, whereas she had historically tracked along the 5050 th percentile. She has Tanner stage 33 breasts and Tanner stage 22 pubic hair. Radiographic assessment of the left wrist indicates a skeletal age of 1010 years. A random serum luteinizing hormone (LH) level is markedly elevated. Which of the following is the most appropriate next step in the evaluation of this patient?

  1. Magnetic resonance imaging of the brainCevap
  2. B
    Gonadotropin-releasing hormone stimulation test
  3. C
    Pelvic ultrasonography
  4. D
    Observation and reassurance
  5. E
    Measurement of serum 17-hydroxyprogesterone

Cevap

Magnetic resonance imaging of the brain
The correct answer is magnetic resonance imaging (MRI) of the brain. This patient presents with precocious puberty, defined as the onset of secondary sexual characteristics before age 88 in girls. The evaluation of precocious puberty begins with a bone age radiograph. Because her bone age is advanced (1010 years compared to a chronological age of 77), she has true precocious puberty. The next step is evaluating luteinizing hormone (LH) levels. An elevated baseline LH level confirms central (gonadotropin-dependent) precocious puberty, indicating premature activation of the hypothalamic-pituitary-gonadal axis. All patients with central precocious puberty require an MRI of the brain to rule out central nervous system lesions, such as a hypothalamic hamartoma, before initiating therapy with a GnRH agonist.

Adım Adım Çözüm

1
Identify the patient's condition based on clinical presentation.
The patient has early breast development and pubic hair before age 88, indicating precocious puberty.
Recognizing precocious puberty is the first step to determining the appropriate diagnostic algorithm.
2
Interpret the diagnostic test results provided in the stem.
The bone age is advanced (1010 years vs chronological 77 years), confirming true precocious puberty. The baseline LH is elevated, confirming a gonadotropin-dependent (central) etiology.
Advanced bone age differentiates true precocious puberty from isolated premature thelarche. Elevated LH differentiates central from peripheral causes.
3
Determine the required next step in management for central precocious puberty.
Magnetic resonance imaging of the brain is the next indicated step.
Central precocious puberty can be idiopathic, but it is frequently caused by central nervous system tumors (e.g., hypothalamic hamartomas), which must be ruled out.

Anahtar Kavram

Evaluation of central precocious puberty requires a brain MRI to rule out CNS lesions before initiating treatment.
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Pediatric Endocrine Disorders

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