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Pathology - Craniopharyngioma
Originating from residual tissue of Rathke's pouch, the embryonic precursor of the anterior pituitary gland.
Typically happens in childhood.
Pituitary craniopharyngioma typically presents as a cyst with calcification, containing layers of stratified squamous or columnar epithelium with keratin development.
Symptoms and signs
Bitemporal hemianopsia or other visual problems may occur due to potential constriction of the optic chiasm, leading to growth retardation, diabetes insipidus, or other pituitary deficits.
Imaging: Radiographs can identify calcified lesions in the brain.
Procedure Surgically excising the adenoma.
Originating from residual tissue of Rathke's pouch, the embryonic precursor of the anterior pituitary gland.
Typically happens in childhood.
Pituitary craniopharyngioma typically presents as a cyst with calcification, containing layers of stratified squamous or columnar epithelium with keratin development.
Symptoms and signs
Bitemporal hemianopsia or other visual problems may occur due to potential constriction of the optic chiasm, leading to growth retardation, diabetes insipidus, or other pituitary deficits.
Imaging: Radiographs can identify calcified lesions in the brain.
Procedure Surgically excising the adenoma.
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Pathology - Syndrome of Inappropriate ADH ( SIADH)
Syndrome of Inappropriate Antidiuretic Hormone (SIADH) can be caused by pulmonary disorders (such as COPD and pneumonia), intracranial issues (like trauma, hemorrhage, and stroke), certain medications (such as antipsychotics and chemotherapy), or pain. It can also result from abnormal ADH production by tumors like small-cell bronchogenic carcinoma.
Pathology
Heightened ADH secretion leads to water retention in the collecting duct of the nephron.
Water retention results in the dilution of serum electrolytes, particularly sodium, leading to lower levels of electrolytes and serum osmolality.
Clinical Symptoms and Signs
Fatigue and confusion resulting from low levels of sodium in the blood and normal fluid volume.
Laboratory results: Low sodium levels, reduced serum osmolality, elevated urine osmolality.
Treatment includes fluid restriction, demeclocycline, and hypertonic saline for severe hyponatremia.
Syndrome of Inappropriate Antidiuretic Hormone (SIADH) can be caused by pulmonary disorders (such as COPD and pneumonia), intracranial issues (like trauma, hemorrhage, and stroke), certain medications (such as antipsychotics and chemotherapy), or pain. It can also result from abnormal ADH production by tumors like small-cell bronchogenic carcinoma.
Pathology
Heightened ADH secretion leads to water retention in the collecting duct of the nephron.
Water retention results in the dilution of serum electrolytes, particularly sodium, leading to lower levels of electrolytes and serum osmolality.
Clinical Symptoms and Signs
Fatigue and confusion resulting from low levels of sodium in the blood and normal fluid volume.
Laboratory results: Low sodium levels, reduced serum osmolality, elevated urine osmolality.
Treatment includes fluid restriction, demeclocycline, and hypertonic saline for severe hyponatremia.
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Pathology - Acromegaly and Gigantism
Resulting from a pituitary somatotropic adenoma.
Pituitary adenoma consists of many acidophilic cells that carry secretory granules filled with growth hormone (GH).
Pathophysiology: Elevated growth hormone leads to heightened release of insulin-like growth factor from the liver.
Symptoms and signs
Gigantism in children is characterized by excessive height due to the presence of an adenoma before the closure of the growth plates.
Acromegaly is a condition that occurs in adults due to the presence of an adenoma after the closure of the epiphyses. It is characterized by the enlargement of hands, feet, skull, and mandible, weight gain, insulin resistance leading to high blood sugar levels, hypertension, enlarged heart, heart failure, and possibly hypogonadism with symptoms like amenorrhea or reduced sex drive.
Patients may experience bitemporal hemianopsia or other visual abnormalities as a result of potential compression of the optic chiasm by an adenoma.
Laboratory results: Hyperglycemia is characterized by increased levels of growth hormone (GH) and insulin-like growth factor 1.
Treatment involves the use of octreotide, a somatostatin analog that reduces GH release by feedback inhibition, and surgical excision of the adenoma.
Resulting from a pituitary somatotropic adenoma.
Pituitary adenoma consists of many acidophilic cells that carry secretory granules filled with growth hormone (GH).
Pathophysiology: Elevated growth hormone leads to heightened release of insulin-like growth factor from the liver.
Symptoms and signs
Gigantism in children is characterized by excessive height due to the presence of an adenoma before the closure of the growth plates.
Acromegaly is a condition that occurs in adults due to the presence of an adenoma after the closure of the epiphyses. It is characterized by the enlargement of hands, feet, skull, and mandible, weight gain, insulin resistance leading to high blood sugar levels, hypertension, enlarged heart, heart failure, and possibly hypogonadism with symptoms like amenorrhea or reduced sex drive.
Patients may experience bitemporal hemianopsia or other visual abnormalities as a result of potential compression of the optic chiasm by an adenoma.
Laboratory results: Hyperglycemia is characterized by increased levels of growth hormone (GH) and insulin-like growth factor 1.
Treatment involves the use of octreotide, a somatostatin analog that reduces GH release by feedback inhibition, and surgical excision of the adenoma.
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Pathology - Acute Renal Failure
Prerenal causes include reduced effective arterial volume (e.g., congestive heart failure, hypovolemia, systemic vasodilation such as in sepsis) or renal vasoconstriction due to medications like NSAIDs, ACE inhibitors, or the renin-angiotensin system.
Intrarenal causes include acute tubular necrosis, acute interstitial nephritis, glomerulonephritis, and thrombotic microangiopathy.
Postrenal causes include kidney stones, benign prostatic hyperplasia (BPH), neurogenic bladder, and neoplasia.
Prerenal conditions occur when there is reduced blood flow to the kidneys, leading to a decrease in glomerular filtration rate (GFR) and causing the retention of salt and water.
Intrarenal: Defined by patchy tubular necrosis causing tubule blockage, fluid backflow through the necrotic tubule, and subsequent reduction in GFR.
Postrenal conditions occur only when there is bilateral outflow blockage, leading to increased ureteral pressure that affects nephrotubules and reduces glomerular filtration rate (GFR).
Oliguria, azotemia, and hyperkalemia.
Lab results: (1) Prerenal: low urinary Na+ (< 10), high urine osmolality (> 500), fractional excretion of Na+ (Fe Na+) < 1%, BUN/Cr ratio > 20; (2) Intrarenal: low urine osmolality (< 350), Fe Na+ > 2%, presence of urinary epithelial/granular casts; (3) Postrenal: high urinary Na+ (> 40), Fe Na+ > 4%, BUN/Cr ratio > 20.
Pre- and intrarenal: Manage fluid and electrolyte levels; address underlying cause; consider dialysis if needed.
Postrenal: Managing blockage.
Prerenal causes include reduced effective arterial volume (e.g., congestive heart failure, hypovolemia, systemic vasodilation such as in sepsis) or renal vasoconstriction due to medications like NSAIDs, ACE inhibitors, or the renin-angiotensin system.
Intrarenal causes include acute tubular necrosis, acute interstitial nephritis, glomerulonephritis, and thrombotic microangiopathy.
Postrenal causes include kidney stones, benign prostatic hyperplasia (BPH), neurogenic bladder, and neoplasia.
Prerenal conditions occur when there is reduced blood flow to the kidneys, leading to a decrease in glomerular filtration rate (GFR) and causing the retention of salt and water.
Intrarenal: Defined by patchy tubular necrosis causing tubule blockage, fluid backflow through the necrotic tubule, and subsequent reduction in GFR.
Postrenal conditions occur only when there is bilateral outflow blockage, leading to increased ureteral pressure that affects nephrotubules and reduces glomerular filtration rate (GFR).
Oliguria, azotemia, and hyperkalemia.
Lab results: (1) Prerenal: low urinary Na+ (< 10), high urine osmolality (> 500), fractional excretion of Na+ (Fe Na+) < 1%, BUN/Cr ratio > 20; (2) Intrarenal: low urine osmolality (< 350), Fe Na+ > 2%, presence of urinary epithelial/granular casts; (3) Postrenal: high urinary Na+ (> 40), Fe Na+ > 4%, BUN/Cr ratio > 20.
Pre- and intrarenal: Manage fluid and electrolyte levels; address underlying cause; consider dialysis if needed.
Postrenal: Managing blockage.
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Pathology - Chronic Kidney Disease
Linked to diabetes, hypertension, glomerular illnesses such as RPGN, vasculitides like Wegener granulomatosis, renal artery stenosis, medicines such as lithium and sulfa drugs, infections, or autoimmune diseases like SLE.
As glomerular filtration rate decreases, the kidney's ability to regulate electrolyte balances, such as potassium excretion leading to hyperkalemia, and sodium and water handling causing volume overload, diminishes. Additionally, the kidney's capacity to maintain pH balance is compromised, resulting in metabolic acidosis due to insufficient ammonia production to bind with endogenous acid and be excreted as ammonium. Anemia occurs due to reduced production of erythropoietin by malfunctioning kidneys.
Clinical Symptoms
Initially asymptomatic, chronic kidney disease (CKD) advances to cause symptoms such as edema, dyspnea due to volume overload, fatigue, and weakness.
Possible complications consist of cardiac arrhythmias due to electrolyte imbalances, encephalopathy, platelet dysfunction, renal osteodystrophy, and pericarditis.
Laboratory results indicate anemia, increased blood urea nitrogen (BUN) and creatinine levels, metabolic acidosis, low calcium levels (hypocalcemia), high phosphate levels (hyperphosphatemia), and high potassium levels (hyperkalemia).
Prescribe ACE inhibitors and diuretics, check electrolytes, administer phosphate binders, manage underlying disease. Advanced stages may necessitate dialysis or transplant.
Individuals undergoing long-term dialysis for chronic kidney disease have a 5-year survival rate of 35%.
Reasons to start dialysis in chronic kidney disease include metabolic imbalances such as acidosis and hyperkalemia, controlling excess fluid, advancing uremic encephalopathy, and managing symptoms of uremia such malnutrition, pericarditis, or pleuritis.
Linked to diabetes, hypertension, glomerular illnesses such as RPGN, vasculitides like Wegener granulomatosis, renal artery stenosis, medicines such as lithium and sulfa drugs, infections, or autoimmune diseases like SLE.
As glomerular filtration rate decreases, the kidney's ability to regulate electrolyte balances, such as potassium excretion leading to hyperkalemia, and sodium and water handling causing volume overload, diminishes. Additionally, the kidney's capacity to maintain pH balance is compromised, resulting in metabolic acidosis due to insufficient ammonia production to bind with endogenous acid and be excreted as ammonium. Anemia occurs due to reduced production of erythropoietin by malfunctioning kidneys.
Clinical Symptoms
Initially asymptomatic, chronic kidney disease (CKD) advances to cause symptoms such as edema, dyspnea due to volume overload, fatigue, and weakness.
Possible complications consist of cardiac arrhythmias due to electrolyte imbalances, encephalopathy, platelet dysfunction, renal osteodystrophy, and pericarditis.
Laboratory results indicate anemia, increased blood urea nitrogen (BUN) and creatinine levels, metabolic acidosis, low calcium levels (hypocalcemia), high phosphate levels (hyperphosphatemia), and high potassium levels (hyperkalemia).
Prescribe ACE inhibitors and diuretics, check electrolytes, administer phosphate binders, manage underlying disease. Advanced stages may necessitate dialysis or transplant.
Individuals undergoing long-term dialysis for chronic kidney disease have a 5-year survival rate of 35%.
Reasons to start dialysis in chronic kidney disease include metabolic imbalances such as acidosis and hyperkalemia, controlling excess fluid, advancing uremic encephalopathy, and managing symptoms of uremia such malnutrition, pericarditis, or pleuritis.
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Pathology - Renal Cell Carcinoma
Linked to von Hippel-Lindau disease, deletion on chromosome 3, and cigarette smoking.
Most prevalent in men with a 2:1 male to female ratio during their sixth decade of life, typically between the ages of 50 and 70.
The kidney pathology is characterized by polygonal transparent cells that are formed from the tubular epithelium and are defined solely by cell membranes with nuclei pushed to the sides.
Invades the inferior vena cava and spreads through the bloodstream to the lungs, bones, and other locations.
Clinical Symptoms and Signs
Characterized by hematuria, palpable abdominal mass, flank pain, prolonged fever, and weight loss; linked with paraneoplastic disorders such as ectopic EPO, ACTH, PTHrP, prolactin, gonadotropins, and renin.
Imaging: CT scan shows a solid mass in the kidney.
Laboratory results: Secondary polycythemia caused by elevated erythropoietin (EPO) levels.
Perform radical nephrectomy for localized disease and administer chemotherapy or radiation for invasive or distant disease.
Renal cell carcinoma is the most prevalent type of kidney cancer.
Linked to von Hippel-Lindau disease, deletion on chromosome 3, and cigarette smoking.
Most prevalent in men with a 2:1 male to female ratio during their sixth decade of life, typically between the ages of 50 and 70.
The kidney pathology is characterized by polygonal transparent cells that are formed from the tubular epithelium and are defined solely by cell membranes with nuclei pushed to the sides.
Invades the inferior vena cava and spreads through the bloodstream to the lungs, bones, and other locations.
Clinical Symptoms and Signs
Characterized by hematuria, palpable abdominal mass, flank pain, prolonged fever, and weight loss; linked with paraneoplastic disorders such as ectopic EPO, ACTH, PTHrP, prolactin, gonadotropins, and renin.
Imaging: CT scan shows a solid mass in the kidney.
Laboratory results: Secondary polycythemia caused by elevated erythropoietin (EPO) levels.
Perform radical nephrectomy for localized disease and administer chemotherapy or radiation for invasive or distant disease.
Renal cell carcinoma is the most prevalent type of kidney cancer.
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Pathology - Transitional Cell Carcinoma
Linked to smoking, alcohol consumption, exposure to aniline dyes, previous cyclophosphamide therapy, and phenacetin misuse.
Most prevalent among males over the age of 40.
The pathology of this condition ranges from flat to papillary and from noninvasive to invasive. It can develop in any part of the urinary tract system (renal calyces, renal pelvis, ureters, bladder) and may extend to adjacent tissue through local extension.
Microscopic examination reveals several stages of carcinoma, ranging from well-differentiated tumor cells similar to normal transitional cells to anaplastic tumor cells with large cells and numerous mitoses.
Typically manifests as painless blood in the urine; may also show signs of irritative voiding symptoms (if there is a concurrent infection), a detectable mass during a bimanual examination, enlarged liver, or swollen lymph nodes above the collarbone (if it has spread).
Treatment for bladder cancer may involve chemotherapy, radiation, transurethral resection, or radical cystectomy, as the cancer often recurs after removal.
Prognosis relies on the stage and grade of the condition.
Squamous cell carcinoma (SCC) of the bladder makes up 3%-7% of bladder malignancies in the United States and is linked to schistosomiasis and other factors causing persistent bladder infection.
Linked to smoking, alcohol consumption, exposure to aniline dyes, previous cyclophosphamide therapy, and phenacetin misuse.
Most prevalent among males over the age of 40.
The pathology of this condition ranges from flat to papillary and from noninvasive to invasive. It can develop in any part of the urinary tract system (renal calyces, renal pelvis, ureters, bladder) and may extend to adjacent tissue through local extension.
Microscopic examination reveals several stages of carcinoma, ranging from well-differentiated tumor cells similar to normal transitional cells to anaplastic tumor cells with large cells and numerous mitoses.
Typically manifests as painless blood in the urine; may also show signs of irritative voiding symptoms (if there is a concurrent infection), a detectable mass during a bimanual examination, enlarged liver, or swollen lymph nodes above the collarbone (if it has spread).
Treatment for bladder cancer may involve chemotherapy, radiation, transurethral resection, or radical cystectomy, as the cancer often recurs after removal.
Prognosis relies on the stage and grade of the condition.
Squamous cell carcinoma (SCC) of the bladder makes up 3%-7% of bladder malignancies in the United States and is linked to schistosomiasis and other factors causing persistent bladder infection.
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Pathology - Wilms Tumor
Resulting from the loss of the WT-1 gene, a tumor suppressor, located on the short arm of chromosome 11.
Typically observed in young children aged 2 to 5.
Pathology: A sizable, single, clearly defined mass in the kidney that arises from primitive metanephric tissue.
Microscopic examination reveals immature stroma with primitive tubules and glomeruli, along with mesenchymal features such as bone, cartilage, and connective tissue.
Clinical Symptoms
Typically appears as a large, painless lump in the side or abdomen of a young child; may also come with fever or stomach pain; can be linked to one-sided muscle enlargement (hemihypertrophy).
Laboratory results: Microscopic presence of blood in urine.
Tumor removal surgery followed by radiation and chemotherapy with actinomycin D and vincristine.
The survival rate is great.
Wilms tumor may be linked with the WAGR complex, which includes Wilms tumor, aniridia (lack of iris), genitourinary malformation, and mental-motor retardation.
Resulting from the loss of the WT-1 gene, a tumor suppressor, located on the short arm of chromosome 11.
Typically observed in young children aged 2 to 5.
Pathology: A sizable, single, clearly defined mass in the kidney that arises from primitive metanephric tissue.
Microscopic examination reveals immature stroma with primitive tubules and glomeruli, along with mesenchymal features such as bone, cartilage, and connective tissue.
Clinical Symptoms
Typically appears as a large, painless lump in the side or abdomen of a young child; may also come with fever or stomach pain; can be linked to one-sided muscle enlargement (hemihypertrophy).
Laboratory results: Microscopic presence of blood in urine.
Tumor removal surgery followed by radiation and chemotherapy with actinomycin D and vincristine.
The survival rate is great.
Wilms tumor may be linked with the WAGR complex, which includes Wilms tumor, aniridia (lack of iris), genitourinary malformation, and mental-motor retardation.
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Pathology - Prolactinoma
Pituitary lactotroph adenoma is the most prevalent type of pituitary tumor that causes this condition.
Pituitary adenoma consists of many chromophobic cells that contain secretory granules filled with prolactin.
Hyperprolactinemia causes reduced levels of LH and FSH by feedback inhibition, leading to amenorrhea and infertility.
Symptoms and signs
Absence of menstruation in women or erectile dysfunction in males; inability to conceive; spontaneous flow of milk from the breasts.
Bitemporal hemianopsia or other visual abnormalities may occur due to potential compression of the optic chiasm by an adenoma.
Laboratory results: Reduced LH and FSH, elevated prolactin levels.
Treatment: Bromocriptine is used as a dopamine analog to inhibit prolactin secretion.
Adenoma removal with surgery or radiation.
Hyperprolactinemia can result from estrogen therapy, hypothyroidism, medications that affect dopamine secretion (such as methyl-dopa, reserpine, antipsychotic medicines), hypothalamic abnormalities, or renal insufficiency.
Pituitary lactotroph adenoma is the most prevalent type of pituitary tumor that causes this condition.
Pituitary adenoma consists of many chromophobic cells that contain secretory granules filled with prolactin.
Hyperprolactinemia causes reduced levels of LH and FSH by feedback inhibition, leading to amenorrhea and infertility.
Symptoms and signs
Absence of menstruation in women or erectile dysfunction in males; inability to conceive; spontaneous flow of milk from the breasts.
Bitemporal hemianopsia or other visual abnormalities may occur due to potential compression of the optic chiasm by an adenoma.
Laboratory results: Reduced LH and FSH, elevated prolactin levels.
Treatment: Bromocriptine is used as a dopamine analog to inhibit prolactin secretion.
Adenoma removal with surgery or radiation.
Hyperprolactinemia can result from estrogen therapy, hypothyroidism, medications that affect dopamine secretion (such as methyl-dopa, reserpine, antipsychotic medicines), hypothalamic abnormalities, or renal insufficiency.
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Pathology - Pituitary Cachexia
Sheehan syndrome is typically caused by pituitary adenomas, ischemic necrosis of the anterior pituitary after postpartum hemorrhage, pituitary surgery, pituitary radiotherapy, or pituitary damage.
Adenoma is a defined growth made up of uniform, polygonal cells.
Sheehan syndrome is characterized by an early hemorrhagic lesion in the anterior pituitary that eventually resolves into a tiny fibrous band.
Generalized panhypopituitarism presents as hypothyroidism (low TSH), hypogonadism with infertility (low LH and FSH), hypocortisolism (low ACTH), reduced prolactin, and decreased growth hormone.
Bitemporal hemianopsia may occur if caused by adenoma, resulting from the compression of the optic chiasm.
Laboratory results: Low blood sugar; low sodium levels; reduced levels of estrogen, testosterone, and progesterone; lowered cortisol; decreased T4.
Treatment options include hormone replacement therapy and surgical excision of the adenoma.
Pituitary adenomas can lead to hyperpituitarism and may be linked to MEN type I syndrome.
Sheehan syndrome is typically caused by pituitary adenomas, ischemic necrosis of the anterior pituitary after postpartum hemorrhage, pituitary surgery, pituitary radiotherapy, or pituitary damage.
Adenoma is a defined growth made up of uniform, polygonal cells.
Sheehan syndrome is characterized by an early hemorrhagic lesion in the anterior pituitary that eventually resolves into a tiny fibrous band.
Generalized panhypopituitarism presents as hypothyroidism (low TSH), hypogonadism with infertility (low LH and FSH), hypocortisolism (low ACTH), reduced prolactin, and decreased growth hormone.
Bitemporal hemianopsia may occur if caused by adenoma, resulting from the compression of the optic chiasm.
Laboratory results: Low blood sugar; low sodium levels; reduced levels of estrogen, testosterone, and progesterone; lowered cortisol; decreased T4.
Treatment options include hormone replacement therapy and surgical excision of the adenoma.
Pituitary adenomas can lead to hyperpituitarism and may be linked to MEN type I syndrome.
Sheehan Syndrome
