PANCE Blueprint Endocrinology (6%)

The cytology showing a benign nodule in a patient with normal thyroid function indicates this is likely a benign thyroid adenoma. These are followed with serial ultrasound and observed if stable. Although the ideal timing for follow up ultrasound is up for debate - data supports repeat evaluation 2-4 years after the initial benign FINA. Repeat aspiration is needed only if the nodule grows. Thyroidectomy, radioactive iodine, and suppressive levothyroxine therapy are not indicated for benign nodules. Therefore, observation with follow-up ultrasound is the best management. (Review PANRE Blueprint Topic: Thyroid neoplastic disease)

This patient has signs and symptoms of hypercortisolism along with elevated urine free cortisol, consistent with Cushing syndrome. The lack of hyperpigmentation makes ACTH-dependent causes like pituitary adenoma less likely. Ectopic ACTH would also present with more hypokalemia. McCune-Albright classically causes peripheral precocious puberty in children. An adrenal adenoma causing unilateral hypersecretion is the most likely etiology in an adult patient. (Review PANRE Blueprint Topic: Cushing’s syndrome)

The patient's symptoms and lab findings are consistent with diabetes insipidus. Administering desmopressin, a synthetic ADH, can confirm the diagnosis and help differentiate between central and nephrogenic forms. Treatment of central diabetes insipidus is also with desmopressin. (Review PANRE Blueprint Topic: Diabetes insipidus)

This patient has elevated calcium and intact PTH, consistent with primary hyperparathyroidism. He has no evidence of volume depletion or renal impairment that would cause pseudohyperparathyroidism. In a symptomatic patient, parathyroidectomy to resect the overactive gland(s) is definitive treatment. Medical management with cinacalcet can lower calcium but does not address the underlying cause. IV fluids can temporarily lower calcium in dehydration but are not definitive. Vitamin D and bisphosphonates like zoledronic acid are not indicated and could worsen hypercalcemia. Therefore, parathyroidectomy is the most appropriate management. (Review PANRE Blueprint Topic: Hyperparathyroidism )

The patient's symptoms and lab findings are indicative of hyperthyroidism. A radioactive iodine uptake test is the next step to differentiate between various causes of hyperthyroidism, such as Graves' disease, toxic multinodular goiter, or thyroiditis. (Review PANRE Blueprint Topic: Hyperthyroidism )

This patient has severe hypertriglyceridemia, which places her at risk for acute pancreatitis. Given her triglyceride levels are above 886 mg/dL and LDL cholesterol is at goal on high does atorvastatin pharmacotherapy is urgently needed. Fibrates, such as fenofibrate, are the best initial medical treatment for severe hypertriglyceridemia. (Review PANRE Blueprint Topic: Hypertriglyceridemia )

This patient has hypocalcemia likely secondary to hypoparathyroidism following thyroidectomy. Given the acute symptoms and the significantly low calcium level, immediate intravenous calcium gluconate is indicated to quickly correct the calcium imbalance. (Review PANRE Blueprint Topic: Hypoparathyroidism )

This patient has elevated TSH and low free T4 and total T3, indicating overt primary hypothyroidism. There is no evidence of thyroiditis based on lack of pain and normal thyroid on exam. Secondary hypothyroidism from pituitary pathology would show low or normal TSH. Medications can cause hypothyroidism but there is no clear indication in the history. Therefore, primary hypothyroidism, most likely from chronic autoimmune thyroiditis, is the most likely diagnosis. (Review PANRE Blueprint Topic: Hypothyroidism)

This patient meets the criteria for metabolic syndrome, which includes abdominal obesity, elevated blood pressure, elevated fasting glucose, and dyslipidemia. The cornerstone of treatment for metabolic syndrome is lifestyle modification, including diet, exercise, and weight loss. (Review PANRE Blueprint Topic: Obesity and Metabolic Syndrome)

A T-score of -1.2 indicates osteopenia, as it falls between -1.0 and -2.5, according to WHO criteria. This patient does not have normal bone density (which requires a T-score of -1.0 or above) nor osteoporosis (which requires a T-score of -2.5 or below). For this 55-year-old postmenopausal woman, the next step is to assess her fracture risk using the FRAX tool, which considers factors like age, BMI, and family history of fracture. Immediate bisphosphonate therapy is not indicated unless her fracture risk is high. She should focus on lifestyle modifications: adequate calcium (1200 mg/day), vitamin D (800-1000 IU/day), and weight-bearing exercise. A repeat DEXA scan is not immediately necessary but may be considered in 1-2 years to monitor progression. (Review PANRE Blueprint Topic: Osteoporosis )

This patient has low morning cortisol with inappropriately elevated ACTH and low aldosterone. This pattern is consistent with primary adrenal insufficiency due to dysfunction of the adrenal glands. Secondary AI would show low ACTH from pituitary pathology. Tertiary AI refers to hypothalamic dysfunction. Renal artery stenosis would elevate renin. Glucocorticoid resistance would present with higher cortisol levels. (Review PANRE Blueprint Topic: Primary adrenal insufficiency)

In the case of papillary thyroid carcinoma, total thyroidectomy is the recommended first-line surgical treatment. This approach is favored because it allows for the complete removal of the tumor along with any microscopic disease that may be present in the thyroid gland. Papillary thyroid carcinoma is the most common type of thyroid cancer and is generally slow-growing with a good prognosis. However, it can metastasize to lymph nodes, making complete surgical removal crucial for optimal outcomes. After surgery, patients are often treated with radioactive iodine ablation to destroy any remaining thyroid tissue and to treat or prevent metastatic disease. Thyroid hormone replacement therapy is usually required after total thyroidectomy. Regular follow-up with serum thyroglobulin levels and imaging studies are essential for monitoring. (Review PANRE Blueprint Topic: Thyroid neoplastic disease)

The patient's symptoms of neck pain, fatigue, and fever, along with an enlarged and tender thyroid gland and suppressed TSH, are indicative of subacute thyroiditis. This condition is often viral in origin and can present with a hyperthyroid phase due to the release of preformed thyroid hormone. Treatment often involves NSAIDs for symptom relief and beta-blockers for symptomatic hyperthyroidism. Corticosteroids may be considered for severe cases. (Review PANRE Blueprint Topic: Thyroiditis)

In type 1 diabetes mellitus, the body's immune system destroys the insulin-producing beta cells in the pancreas. C-peptide is a byproduct of insulin production, and a low fasting C-peptide level indicates reduced insulin production, supporting the diagnosis of type 1 diabetes. Treatment involves lifelong insulin replacement. (Review PANRE Blueprint Topic: Diabetes mellitus type 1)

The patient is presenting with diabetic ketoacidosis (DKA), a life-threatening complication of type 1 diabetes characterized by hyperglycemia, ketonemia, and metabolic acidosis. The cornerstone of treatment is insulin therapy to lower blood glucose and resolve ketonemia. The addition of 5% dextrose prevents hypoglycemia as the blood glucose levels decrease with treatment. (Review PANRE Blueprint Topic: Diabetes mellitus type 1)

The patient's symptoms and lab findings are consistent with Type 2 Diabetes Mellitus. The first-line pharmacologic treatment for Type 2 Diabetes is metformin, unless contraindicated. Metformin works by decreasing hepatic glucose production and increasing insulin sensitivity, thereby lowering both fasting and postprandial blood glucose levels. (Review PANRE Blueprint Topic: Diabetes Mellitus Type 2)

The profound hyperglycemia and hyperosmolality without significant acidosis or ketosis is consistent with hyperosmolar hyperglycemic syndrome (HHS). Initial management involves aggressive IV hydration with 0.9% saline to promote gradual osmotic diuresis and prevent cerebral edema. Insulin is given after initial fluids to slowly correct the hyperglycemia. 0.45% saline is inappropriate as it can worsen cerebral edema. Sodium bicarbonate and octreotide do not have a clear role in HHS management. (PANRE Blueprint Topic: Hyperosmolar hyperglycemic syndrome)

This patient has biochemical evidence of vitamin D deficiency along with symptoms including back pain, muscle weakness, and fatigue. Vitamin D plays a crucial role in calcium homeostasis and bone health. Deficiency can lead to osteomalacia in adults, characterized by bone tenderness, muscle weakness, and fatigue. Hyperreflexia, tetany, and positive Chvostek sign indicate associated hypocalcemia, which is not present. Lung findings are not associated with vitamin D deficiency. (Review PANRE Blueprint Topic: Hypervitaminosis/hypovitaminosis)