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Pathology - Hypoparathyroidism
The condition can be caused by surgical removal of the parathyroid glands, congenital lack of the parathyroid glands (as seen in DiGeorge syndrome), radioactive iodine therapy, or idiopathic autoimmune atrophy of the parathyroids.
Pathology
Gross finding: Slight reduction in the size of the gland.
Microscopic: Fibrotic tissue replaces main cells.
Hypocalcemia symptoms include tetany, prolonged QT interval on ECG, Trousseau sign, and Chvostek sign.
Laboratory results indicate low levels of calcium, reduced parathyroid hormone (PTH) levels, and elevated serum phosphate levels.
Therapy includes calcium and vitamin D supplements.
The condition can be caused by surgical removal of the parathyroid glands, congenital lack of the parathyroid glands (as seen in DiGeorge syndrome), radioactive iodine therapy, or idiopathic autoimmune atrophy of the parathyroids.
Pathology
Gross finding: Slight reduction in the size of the gland.
Microscopic: Fibrotic tissue replaces main cells.
Hypocalcemia symptoms include tetany, prolonged QT interval on ECG, Trousseau sign, and Chvostek sign.
Laboratory results indicate low levels of calcium, reduced parathyroid hormone (PTH) levels, and elevated serum phosphate levels.
Therapy includes calcium and vitamin D supplements.
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Pathology - Pseudohypoparathyroidism
Autosomal recessive condition causing a faulty PTH receptor.
Deficiency in Gs-a results in reduced connection between the PTH receptor and adenylate cyclase, causing the PTH receptor to be unable to activate the target cell.
The regulation of Gs-a is changed so that the target cell does not respond to PTH receptor stimulation.
Symptoms and signs
Hypocalcemia symptoms include tetany, extended QT interval on ECG, Trousseau sign, and Chvostek sign.
Pseudohypoparathyroidism is linked to Albright hereditary osteodystrophy, a group of diseases that involve pseudohypoparathyroidism, small stature, developmental delay, shortened fourth and fifth metacarpal and metatarsal bones, and obesity.
Laboratory results: Hypocalcemia, low PTH levels, elevated serum phosphate levels.
Therapy involves calcium and vitamin D supplements.
Autosomal recessive condition causing a faulty PTH receptor.
Deficiency in Gs-a results in reduced connection between the PTH receptor and adenylate cyclase, causing the PTH receptor to be unable to activate the target cell.
The regulation of Gs-a is changed so that the target cell does not respond to PTH receptor stimulation.
Symptoms and signs
Hypocalcemia symptoms include tetany, extended QT interval on ECG, Trousseau sign, and Chvostek sign.
Pseudohypoparathyroidism is linked to Albright hereditary osteodystrophy, a group of diseases that involve pseudohypoparathyroidism, small stature, developmental delay, shortened fourth and fifth metacarpal and metatarsal bones, and obesity.
Laboratory results: Hypocalcemia, low PTH levels, elevated serum phosphate levels.
Therapy involves calcium and vitamin D supplements.
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Pathology - Conn Syndrome
Resulting from aldosterone-secreting adrenocortical adenoma or hyperplasia.
Adrenal cortex: An adenoma is a single enclosed growth made up of consistent cortical cells that are packed with vesicles holding lipids.
Hyperplasia: increased cell growth in the zona glomerulosa.
Symptoms and signs
Hypertension, muscle weakness occasionally accompanied by tetany, headache, excessive urination, and increased thirst.
Laboratory results: Metabolic alkalosis, low serum potassium, reduced renin levels, elevated aldosterone levels.
Therapies
Adrenalectomy is recommended for unilateral adenoma, whereas spironolactone, a potassium-sparing diuretic, is prescribed for bilateral adrenal hyperplasia. Antihypertensive treatment should be used as necessary.
Secondary hyperaldosteronism is linked to conditions that cause the kidneys to detect a low effective circulation volume, such as renal ischemia, chronic renal failure, hepatic cirrhosis, congestive heart failure, or nephrotic syndrome. It is linked to elevated aldosterone levels caused by high renin levels.
Resulting from aldosterone-secreting adrenocortical adenoma or hyperplasia.
Adrenal cortex: An adenoma is a single enclosed growth made up of consistent cortical cells that are packed with vesicles holding lipids.
Hyperplasia: increased cell growth in the zona glomerulosa.
Symptoms and signs
Hypertension, muscle weakness occasionally accompanied by tetany, headache, excessive urination, and increased thirst.
Laboratory results: Metabolic alkalosis, low serum potassium, reduced renin levels, elevated aldosterone levels.
Therapies
Adrenalectomy is recommended for unilateral adenoma, whereas spironolactone, a potassium-sparing diuretic, is prescribed for bilateral adrenal hyperplasia. Antihypertensive treatment should be used as necessary.
Secondary hyperaldosteronism is linked to conditions that cause the kidneys to detect a low effective circulation volume, such as renal ischemia, chronic renal failure, hepatic cirrhosis, congestive heart failure, or nephrotic syndrome. It is linked to elevated aldosterone levels caused by high renin levels.
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Pathology - Cushing Syndrome
Hypercortisolism can be caused by iatrogenic cortisol injection, increased ACTH production by pituitary adenoma/hyperplasia (Cushing disease), adrenal cortical adenoma/carcinoma, or ectopic ACTH-secreting tumors (typically small cell bronchogenic carcinoma).
The pathophysiology of the adrenal gland is determined by its underlying cause. (1) Iatrogenic: Adrenocortical atrophy caused by medical treatment; (2) ACTH overproduction: Enlargement of lipid-rich cells in the zona fasciculata of both adrenal glands; (3) Adrenal adenoma: Small enclosed growth made up of uniform zona fasciculata cells; (4) Pituitary hyperplasia or adenoma (observed in Cushing disease): Accumulation of basophilic cells.
Clinical Symptoms and Signs
Truncal obesity, hypertension, moon facies, buffalo hump, muscular wasting, hyperglycemia from insulin resistance, skin alterations such purple abdomen striae and bruises, osteoporosis, hirsutism, mental state changes, immunological suppression, and central obesity.
Laboratory results: Elevated cortisol levels, atypical ACTH levels (lower in cases of iatrogenic and adrenal adenoma, higher in pituitary adenoma and ectopic ACTH secretion), hyperglycemia.
Clinical manifestations
Surgical removal of pituitary or adrenal adenoma, or ectopic ACTH-secreting tumors.
Therapies
The dexamethasone suppression test is utilized to identify the cause of Cushing's illness.
High doses of dexamethasone decrease cortisol levels in Cushing's disease from pituitary adenomas but do not modify levels in cases caused by ectopic ACTH-secreting tumors.
Hypercortisolism can be caused by iatrogenic cortisol injection, increased ACTH production by pituitary adenoma/hyperplasia (Cushing disease), adrenal cortical adenoma/carcinoma, or ectopic ACTH-secreting tumors (typically small cell bronchogenic carcinoma).
The pathophysiology of the adrenal gland is determined by its underlying cause. (1) Iatrogenic: Adrenocortical atrophy caused by medical treatment; (2) ACTH overproduction: Enlargement of lipid-rich cells in the zona fasciculata of both adrenal glands; (3) Adrenal adenoma: Small enclosed growth made up of uniform zona fasciculata cells; (4) Pituitary hyperplasia or adenoma (observed in Cushing disease): Accumulation of basophilic cells.
Clinical Symptoms and Signs
Truncal obesity, hypertension, moon facies, buffalo hump, muscular wasting, hyperglycemia from insulin resistance, skin alterations such purple abdomen striae and bruises, osteoporosis, hirsutism, mental state changes, immunological suppression, and central obesity.
Laboratory results: Elevated cortisol levels, atypical ACTH levels (lower in cases of iatrogenic and adrenal adenoma, higher in pituitary adenoma and ectopic ACTH secretion), hyperglycemia.
Clinical manifestations
Surgical removal of pituitary or adrenal adenoma, or ectopic ACTH-secreting tumors.
Therapies
The dexamethasone suppression test is utilized to identify the cause of Cushing's illness.
High doses of dexamethasone decrease cortisol levels in Cushing's disease from pituitary adenomas but do not modify levels in cases caused by ectopic ACTH-secreting tumors.
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Pathology - Primary Adrenocortical Insufficiency (Addison Disease)
Addison's disease is a kind of primary adrenocortical insufficiency.
Possible causes consist of autoimmune adrenalitis, TB infection, bilateral adrenal bleeding after trauma, surgery, or anticoagulant medication, amyloidosis, and metastatic neoplasms in the adrenal gland.
Pathology
Gross: Adrenal gland that has decreased in size due to atrophy.
Microscopic findings include a small number of cortical cells and the presence of lymphoid infiltration, which is characteristic of autoimmune adrenalitis.
Clinical Symptoms
Symptoms of reduced glucocorticoids include weakness, weariness, nausea, vomiting, and skin hyperpigmentation caused by elevated MSH production, a precursor molecule of ACTH.
Symptoms of reduced mineralocorticoids include low blood pressure, low blood sugar, high levels of potassium, and low levels of sodium.
Laboratory results indicate increased ACTH levels and decreased cortisol levels.
Treatment involves replacing glucocorticoids and mineralocorticoids.
Secondary adrenocortical insufficiency can result from pituitary or hypothalamic disorders that decrease ACTH production, including persistent glucocorticoid medication, malignancy, infection, or trauma. This condition resembles primary adrenocortical insufficiency but lacks hyperpigmentation due to reduced MSH levels.
Waterhouse-Friderichsen syndrome is characterized by sudden bilateral adrenal insufficiency resulting from hemorrhagic necrosis of the adrenal glands, typically triggered by disseminated intravascular coagulation (DIC) or meningococcemia.
Addison's disease is a kind of primary adrenocortical insufficiency.
Possible causes consist of autoimmune adrenalitis, TB infection, bilateral adrenal bleeding after trauma, surgery, or anticoagulant medication, amyloidosis, and metastatic neoplasms in the adrenal gland.
Pathology
Gross: Adrenal gland that has decreased in size due to atrophy.
Microscopic findings include a small number of cortical cells and the presence of lymphoid infiltration, which is characteristic of autoimmune adrenalitis.
Clinical Symptoms
Symptoms of reduced glucocorticoids include weakness, weariness, nausea, vomiting, and skin hyperpigmentation caused by elevated MSH production, a precursor molecule of ACTH.
Symptoms of reduced mineralocorticoids include low blood pressure, low blood sugar, high levels of potassium, and low levels of sodium.
Laboratory results indicate increased ACTH levels and decreased cortisol levels.
Treatment involves replacing glucocorticoids and mineralocorticoids.
Secondary adrenocortical insufficiency can result from pituitary or hypothalamic disorders that decrease ACTH production, including persistent glucocorticoid medication, malignancy, infection, or trauma. This condition resembles primary adrenocortical insufficiency but lacks hyperpigmentation due to reduced MSH levels.
Waterhouse-Friderichsen syndrome is characterized by sudden bilateral adrenal insufficiency resulting from hemorrhagic necrosis of the adrenal glands, typically triggered by disseminated intravascular coagulation (DIC) or meningococcemia.
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Pathology- Congenital Adrenal Hyperplasias
Autosomal recessive defect in enzymes related to the production of cortical steroids.
Bilateral nodular hyperplasia of the adrenal gland with lipid-depleted cortical cells.
21-beta-hydroxylase deficiency disrupts the production of aldosterone and cortisol, leading to the redirection of precursor molecules to produce sex hormones.
11-beta-hydroxylase deficiency disrupts the production of aldosterone and cortisol, leading to the redirection of precursor molecules to produce sex hormones.
17 alpha-Hydroxylase deficiency disrupts the production of cortisol and sex hormones, leading to the redirection of precursor molecules to produce aldosterone.
21-beta Hydroxylase deficiency presents with masculinization, hypotension, hyperkalemia, and hyponatremia, which can result in hypovolemia due to salt wasting.
11-beta Hydroxylase deficiency presents with masculinization, premature puberty, hypertension (caused by the weak mineralocorticoid activity of 11 beta deoxycorticosterone), and no salt wasting.
17-alpha Hydroxylase deficiency presents with hypertension, hypokalemia, lack of sexual development, and low cortisol levels.
Administering hormones to correct deficiencies and providing treatment for symptoms.
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Pathology - Pheochromocytoma
Approximately 90% of instances occur irregularly. Other instances are linked to MEN IIA, MEN IIB, neurofibromatosis, or von Hippel-Lindau disease.
Pathology
Gross findings include variable alterations in the adrenal medulla, ranging from small confined lesions to massive hemorrhagic lesions with a lobular pattern.
The tumor is made up of clusters of polygonal chromaffin cells with catecholamine-rich granules. Occasionally, enormous, pleomorphic cells can be observed.
Symptoms and signs
Intermittent bouts of hypertension, headache, palpitations, and diaphoresis are caused by the release of epinephrine and norepinephrine from tumors.
Laboratory results: Elevated 24-hour urinary catecholamine and metanephrine levels, as well as elevated plasma metanephrine levels.
Therapies
Begin treatment with alpha-adrenergic blocking medications (phenoxybenzamine) and then proceed with surgical removal of the mass.
Pheochromocytomas exhibit the following characteristics: 10% are malignant, 10% are bilateral, 10% are familial, 10% are extra-adrenal, and 10% occur in youngsters. Pheochromocytomas can develop in locations other than the adrenal gland and are referred to as paragangliomas.
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Pathology - Diabetes Mellitus
Type 1 diabetes results from the loss of pancreatic beta cells due to genetic predisposition (HLA-DR3 or -DR4), autoimmune responses, and environmental factors (such as Coxsackie and other viruses). It typically affects individuals under 20 years old.
Type 2 diabetes is characterized by peripheral tissue insulin resistance due to reduced insulin receptors and decreased responsiveness of beta cells to glucose. Approximately 90% of type 2 diabetes patients have a family history of the condition and it commonly affects obese middle-aged individuals.
Hyperglycemia causes elevated glucose excretion in urine, resulting in osmotic diuresis which leads to increased urine output and loss of water and electrolytes (polyuria). This leads to plasma hyperosmolarity which triggers thirst receptors, causing polydipsia.
Insufficient insulin leads to the breakdown of proteins and fats, resulting in weight loss despite an increase in appetite, as seen in type 1 diabetes mellitus.
Enhanced breakdown of fats leads to elevated free fatty acid levels, which results in the generation of ketone bodies and can lead to ketoacidosis, as seen in type 1 diabetes mellitus.
Type 1 diabetes symptoms include hyperglycemia, glycosuria, polyuria, polydipsia, weight loss despite increased appetite, and ketoacidosis characterized by dehydration, deep and fast (Kussmaul) breathing, fruity breath, anion-gap metabolic acidosis, ketonemia, and ketonuria.
Type 2 diabetes symptoms may include high blood sugar levels, sugar in urine, excessive urination, skin or vaginal infections, and nonketotic hyperosmolar coma.
Maturity-onset diabetes of the young (MODY) is a kind of diabetes that results from autosomal dominant genetic abnormalities affecting pancreatic beta-cell activity.
Type 1: Islet atrophy; Infiltration of T-lymphocytes.
Type 2 involves the replacement of islets with amyloid and a slight decrease in islet size.
Pathophysiology: Nonenzymatic glycosylation of proteins in artery walls and tissues results in the entrapment of molecules like LDL and plasma proteins, leading to problems. Hyperglycemia can elevate intracellular sorbitol levels, resulting in osmotic cell injury, particularly in the lens.
Ocular problems may include cataracts, glaucoma, and proliferative retinopathy, which can lead to blindness.
Accelerated atherosclerosis can cause myocardial infarction, gangrene, and stroke by trapping low-density lipoprotein (LDL) in endothelial cells.
Diabetic microangiopathy, caused by NEG, results in thickening of basement membranes in many tissues such as the retina, kidney, skin, and skeletal muscle. This condition can cause delayed wound healing and increase the risk of infection.
Diabetic nephropathy is caused by damage to basement membranes.
Peripheral and autonomic neuropathy can cause a loss of sensation in a stocking-glove distribution, along with delayed motor movements, discomfort, and autonomic instability.
Treatment includes dietary restrictions, insulin replacement for type 1 diabetes, hypoglycemic medicines such as sulfonylureas or insulin for type 2 diabetes, statins for atherosclerosis, and ACE inhibitors for diabetic nephropathy.
Long-term glucose regulation, for example, spanning over a period of 3 months, can be evaluated by measuring the levels of glycosylated hemoglobin (HbA1).
Type 1 diabetes results from the loss of pancreatic beta cells due to genetic predisposition (HLA-DR3 or -DR4), autoimmune responses, and environmental factors (such as Coxsackie and other viruses). It typically affects individuals under 20 years old.
Type 2 diabetes is characterized by peripheral tissue insulin resistance due to reduced insulin receptors and decreased responsiveness of beta cells to glucose. Approximately 90% of type 2 diabetes patients have a family history of the condition and it commonly affects obese middle-aged individuals.
Hyperglycemia causes elevated glucose excretion in urine, resulting in osmotic diuresis which leads to increased urine output and loss of water and electrolytes (polyuria). This leads to plasma hyperosmolarity which triggers thirst receptors, causing polydipsia.
Insufficient insulin leads to the breakdown of proteins and fats, resulting in weight loss despite an increase in appetite, as seen in type 1 diabetes mellitus.
Enhanced breakdown of fats leads to elevated free fatty acid levels, which results in the generation of ketone bodies and can lead to ketoacidosis, as seen in type 1 diabetes mellitus.
Type 1 diabetes symptoms include hyperglycemia, glycosuria, polyuria, polydipsia, weight loss despite increased appetite, and ketoacidosis characterized by dehydration, deep and fast (Kussmaul) breathing, fruity breath, anion-gap metabolic acidosis, ketonemia, and ketonuria.
Type 2 diabetes symptoms may include high blood sugar levels, sugar in urine, excessive urination, skin or vaginal infections, and nonketotic hyperosmolar coma.
Maturity-onset diabetes of the young (MODY) is a kind of diabetes that results from autosomal dominant genetic abnormalities affecting pancreatic beta-cell activity.
Type 1: Islet atrophy; Infiltration of T-lymphocytes.
Type 2 involves the replacement of islets with amyloid and a slight decrease in islet size.
Pathophysiology: Nonenzymatic glycosylation of proteins in artery walls and tissues results in the entrapment of molecules like LDL and plasma proteins, leading to problems. Hyperglycemia can elevate intracellular sorbitol levels, resulting in osmotic cell injury, particularly in the lens.
Ocular problems may include cataracts, glaucoma, and proliferative retinopathy, which can lead to blindness.
Accelerated atherosclerosis can cause myocardial infarction, gangrene, and stroke by trapping low-density lipoprotein (LDL) in endothelial cells.
Diabetic microangiopathy, caused by NEG, results in thickening of basement membranes in many tissues such as the retina, kidney, skin, and skeletal muscle. This condition can cause delayed wound healing and increase the risk of infection.
Diabetic nephropathy is caused by damage to basement membranes.
Peripheral and autonomic neuropathy can cause a loss of sensation in a stocking-glove distribution, along with delayed motor movements, discomfort, and autonomic instability.
Treatment includes dietary restrictions, insulin replacement for type 1 diabetes, hypoglycemic medicines such as sulfonylureas or insulin for type 2 diabetes, statins for atherosclerosis, and ACE inhibitors for diabetic nephropathy.
Long-term glucose regulation, for example, spanning over a period of 3 months, can be evaluated by measuring the levels of glycosylated hemoglobin (HbA1).
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Pathology - Subacute (de Quervain, Granulomatous) Thyroiditis
Linked to viral infection, particularly mumps or Coxsackievirus.
Prevalent among women between the ages of 30 and 50.
Thyroid is mildly enlarged.
Microscopic findings include granulomatous inflammation and destruction of thyroid follicles.
Flu-like symptoms linked to temporary hyperthyroidism, fever, and a sensitive thyroid gland, then transitioning to temporary hypothyroidism.
NSAIDs or prednisone can be used for severe discomfort, with monthly monitoring of thyroid function tests to confirm remission of abnormalities.
Most patients recover to a normal thyroid condition within 6 months in this self-limiting sickness.
Linked to viral infection, particularly mumps or Coxsackievirus.
Prevalent among women between the ages of 30 and 50.
Thyroid is mildly enlarged.
Microscopic findings include granulomatous inflammation and destruction of thyroid follicles.
Flu-like symptoms linked to temporary hyperthyroidism, fever, and a sensitive thyroid gland, then transitioning to temporary hypothyroidism.
NSAIDs or prednisone can be used for severe discomfort, with monthly monitoring of thyroid function tests to confirm remission of abnormalities.
Most patients recover to a normal thyroid condition within 6 months in this self-limiting sickness.
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Pathology - Multinodular Goiter
Typically originates from persistent, uncomplicated goiters, which may result from iodine shortage, goitrogens (such as calcium or fluorides), or deficiency in thyroid hormone biosynthesis enzymes.
Pathology: The thyroid gland shows asymmetrical, nodular hypertrophy.
Microscopic examination reveals individual nodules with colloid-rich follicles, follicular epithelial hyperplasia, and regions of hemorrhage, calcification, and fibrosis.
Clinical Symptoms
Goiter often presents in euthyroid people, although some may have hyperthyroidism. Symptoms may include dysphagia or hoarseness caused by compression of nearby structures.
Treatment involves administering synthetic levothyroxine to patients who are euthyroid in order to control TSH levels and reduce hyperplasia.
A goiter can be either toxic, producing thyroid hormone (TH) and causing hyperthyroidism, or nontoxic, not producing TH.
A biopsy (FNA) is necessary for big irregular nodules to exclude the presence of cancer.
Typically originates from persistent, uncomplicated goiters, which may result from iodine shortage, goitrogens (such as calcium or fluorides), or deficiency in thyroid hormone biosynthesis enzymes.
Pathology: The thyroid gland shows asymmetrical, nodular hypertrophy.
Microscopic examination reveals individual nodules with colloid-rich follicles, follicular epithelial hyperplasia, and regions of hemorrhage, calcification, and fibrosis.
Clinical Symptoms
Goiter often presents in euthyroid people, although some may have hyperthyroidism. Symptoms may include dysphagia or hoarseness caused by compression of nearby structures.
Treatment involves administering synthetic levothyroxine to patients who are euthyroid in order to control TSH levels and reduce hyperplasia.
A goiter can be either toxic, producing thyroid hormone (TH) and causing hyperthyroidism, or nontoxic, not producing TH.
A biopsy (FNA) is necessary for big irregular nodules to exclude the presence of cancer.
