USMLE/COMLEX - Step 2 - Parathyroid Adenoma
Pathophysiology
Parathyroid adenoma is a benign tumor that arises from the parathyroid glands, which are responsible for producing parathyroid hormone (PTH) to regulate calcium and phosphate levels in the body. Parathyroid adenoma results in the overproduction of PTH, causing hypercalcemia and hypophosphatemia.
Symptoms
Fatigue
Weakness
Joint pain
Bone pain
Abdominal pain
Nausea
Vomiting
Constipation
Polyuria
Polydipsia
Findings
Hypercalcemia
Hypophosphatemia
Increased bone resorption
Fractures
Osteoporosis
Hypertension
Diagnosis
Serum calcium, phosphate, and parathyroid hormone levels
Ultrasound, CT scan, or MRI
Sestamibi scan
Fine-needle aspiration biopsy
Genetic testing
Treatment
The treatment for Multiple Endocrine Neoplasia type 1 (MEN1) depends on the specific tumors present and their severity. Some common treatments include:
1. Surgery: This is the primary treatment for parathyroid adenomas and may also be necessary for other tumors.
2. Medical therapy: Drugs such as somatostatin analogs and dopamine agonists can control hormone levels in patients with pancreatic neuroendocrine tumors and pituitary adenomas.
3. Radiation therapy: This may be used to shrink tumors that cannot be surgically removed.
4. Chemotherapy: This may be used in patients with advanced pancreatic neuroendocrine tumors.
5. Surveillance: Regular monitoring is necessary to detect any new tumors that may develop.