Sotos syndrome

Disease Description (Causes and Symptoms)

• Definition summary: A condition in which excessive secretion of certain hormones from the pituitary gland (a small endocrine gland located at the base of the brain) or the development of a hormone-secreting tumor (an adenoma, most of which are benign) causes systemic and endocrine symptoms.
• Main causes: Most commonly a pituitary adenoma (an adenoma that secretes excessive hormones). Rarely, metastatic tumors or non-tumorous conditions may be the cause.
• Pathophysiology summary: Hormones secreted by a tumor or hyperactive cells (e.g., prolactin, growth hormone, ACTH, TSH, etc.) act on target organs and cause characteristic symptoms, respectively (amenorrhea and galactorrhea, acromegaly and gigantism, Cushing disease syndrome, hyperthyroidism, etc.). As the tumor increases in size, pressure-related symptoms such as increased intracranial pressure, visual field defects (bitemporal hemianopia), and headaches may also occur.
• Representative symptoms: Fatigue, sweating, hypertension, hyperglycemia/diabetes, acromegaly (adults), gigantism (children), precocious puberty, facial edema, amenorrhea and galactorrhea (excess prolactin), visual field defects (bitemporal hemianopia), headaches, etc.

Treatment Methods

• General principles after diagnosis: Treatment is determined according to the type of hormone secreted and the tumor’s size and invasiveness.
• Medication treatment
  • Prolactin-secreting tumors (prolactinoma): Dopamine agonists (cabergoline (preferred), bromocriptine) — first-line treatment.
  • Growth hormone-secreting tumors (acromegaly/gigantism): Somatostatin analogs (octreotide, lanreotide), GH receptor antagonists (pegvisomant), etc.
  • Adjunctive or alternative treatment for ACTH secretion (Cushing disease): Pasireotide (in selected cases), adrenal steroid synthesis inhibitors (ketoconazole, metyrapone, etc.) — before or after surgery or when surgery is not possible.
  • TSH-secreting tumors: Somatostatin agonists and other medications may be used.
• Surgery
  • Endoscopic/microsurgical transsphenoidal tumor resection is the standard first-line treatment for non-prolactin hormone-secreting tumors. A skull-base approach (transcranial surgery) may be selected for large or invasive tumors.
• Radiation therapy
  • If complete control cannot be achieved with surgery and medication or if the tumor recurs, external-beam radiation (fractionated radiation) or stereotactic radiosurgery (such as Gamma Knife) may be considered.
• Postoperative and during-treatment management
  • Hormone replacement may be needed for temporarily or permanently reduced pituitary function after surgery (including adrenal, thyroid, gonadal, and water metabolism functions).
  • Management of accompanying metabolic abnormalities such as diabetes, hypertension, and osteoporosis.
• Precautions (treatment-related)
  • Prolactinoma: Consultation is needed regarding management when planning pregnancy and during pregnancy (discontinuation and monitoring of dopamine agonists).
  • Surgical complications: Cerebrospinal fluid leakage, infection, vision changes, and reduced pituitary function (requiring replacement therapy).
  • Warning signs requiring acute attention: Sudden severe headache or visual impairment may indicate pituitary apoplexy (pituitary rupture/hemorrhage, apoplexy), requiring immediate emergency treatment.
  • Risk of long-term complications: Persistent hormone excess increases the risk of diabetes, hypertension, cardiovascular disease, osteoporosis, joint disease, and other conditions.

Checklist Before an Outpatient Visit (Including Example Questions)

• Items and documents to prepare
  • List of currently used medications and supplements (including doses and dosing times)
  • Past medical history, surgical history, and allergy information
  • Copies of previous test results (brain MRI/CT, hormone test results, visual field tests, etc.)
  • Records of symptom changes (when they began, course of each symptom, factors that worsen or improve symptoms)
  • For women, menstrual history, whether pregnancy is planned, and whether breastfeeding
• Regarding preparation for tests
  • Blood tests (hormone measurements) may be affected in interpretation by medication use or pregnancy status -> Ask before the appointment whether medications should be taken or discontinued.
  • Fasting may be required before certain tests, such as an oral glucose tolerance test (OGTT).
• Examples of useful symptom records for the appointment
  • Visual field problems (abnormalities in side vision), headache patterns, changes in libido and erectile dysfunction, infertility, timing and amount of galactorrhea, changes in the size of the hands and feet, changes in weight, blood pressure, and blood glucose, etc.

General Example Questions to Ask the Doctor

• "What type and size is my tumor (or hormonal abnormality)? What is the goal of treatment?"
• "What first-line treatment do you recommend, and why?"
• "What side effects should be expected with medication treatment? How will I be monitored during long-term use?"
• "Is surgery necessary, and what are the approximate success rate and risks (side effects) of surgery?"
• "How often will follow-up tests (hormone tests, MRI, visual field tests) be performed after treatment?"
• "I am planning a pregnancy. Are there any precautions related to treatment?"

Examples of Disease-Specific Questions

• Regarding prolactin-secreting tumors:
  • "I am planning a pregnancy. How should the dopamine agonist (cabergoline) be adjusted before and during pregnancy? Is breastfeeding possible?"
• Regarding growth hormone-secreting tumors (acromegaly):
  • "What are the target levels for IGF-1 (or GH) after treatment, and what additional screenings are needed to reduce the risk of joint and cardiovascular complications?"