Pathology Flashcards
1 cause of Cushing Syndrome
exogenous use of corticosteroids
Bilateral Adrenal Atrophy and decreased ACTH
exogenous use of corticosteroids
Atrophy of uninvolved Adrenal Gland and decreased ACTH
Primary adrenal adenoma, hyperplasia or carcinoma
ACTH-secreting pituitary adenoma
Cushing Dx
Paraneoplastic ACTH secretion
small cell lung cancer, bronchial carcinoids
HTN, wt gain, moon facies, truncal obesity, buffalo hump, hyperglycemia, striae, osteoporosis, amenorrhea, immune suppression
Cushing Syndrome
increase free cortisol on 24hr urinalysis
Cushing Syndrome
Low Dose Dexamethasone suppression test: adequate suppression
Cushing Disease
Low Dose Dexamethasone suppression test: No Suppression
ectopic ACTH secretion
CRH Stimulation Test: increase ACTH and Cortisol
Cushing Disease
CRH Stimulation Test: no increase in ACTH and cortisol
ectopic ACTH secretion
How Cortisol causes Immunosuppression
1) inhibit Phospholipase A2
2) Inhibit IL-2
3) Inhibit Histamine release
1 cause of Primary Hyperaldosterone
Aldosterone-secreting Adrenal Adenoma (Conn)
HTN, hypoK, Met. alkalosis, low plasma renin
Conn Syndrome (Primary Hyperaldosterone)
Cause of Secondary Hyperaldosterone
renal artery stenosis, CHF, cirrhosis or nephrotic syndrome
High Plasma Renin (overactive RAS)
Secondary Hyperaldosteronism
Tx of Secondary Hyperaldosteronism
Spironolactone
Chronic Primary Adrenal Insufficiency due to adrenal atrophy or destruction
Addison Disease
Skin Mucosal Hyperpigmentation, hyperK, acidosis, hypotension, increased ACTH
Aldosterone and cortisol deficiency (Addision Dx)
HyperK, acidosis, hypotension, decreased ACTH
secondary adrenal insuffieincy
Acute primary adrenal insuffiency due to adrenal hemorrhage associated with Niesseria meningitidis, septicemia, DIC and endotoxic shock
Waterhouse-Friedrichsen Syndrome
Most common tumor of adrenal medulla in children
Neuroblastoma
Overexpression of N-myc gene, HTN in children, distended abdomen, Bombesin (+)
Neuroblastoma
Homovanillic acid (HVA) in urine
Breakdown product of dopamine, associated with Neuroblastoma
Episodic HTN, palpitations, tachycardia and sweating
Pheochromocytoma
Rule of 10’s
10% malignant, 10% BL, 10% extra-adrenal (bladder wall), 10% calcify, 10% kids
Pheochromocytoma
Urinary VMA
Pheochromocytoma (breakdown product of NE and Epi)
Tx of Pheochromocytoma
Irreversible alpha-anatognist (phenoxybenzamine) and beta-blockers followed by tumor resection
Salt wasting (hypoNa), kyperK, hypovolemia, HYPOTENSION, clit enlargement or precocious puberty
Congenital Adrenal Hyperplasia, 21-hydroxylase deficiency
Cold intolerance, Weight gain, decreased appetite, Constipation
Hypothyroidism
Dry, cool skin, coarse, brittle hair, bradycardia, hypercholesterolemia
Hypothyroidism
Heat intolerance, weight loss, increased appetite, hyperactive
Hyperthyroidism
Diarrhea, icnreases reflexes, chest pain, palpitations, arrhythmia, warm, moist skin
Hyperthyroidism
Pretibial myxedema
Graves Dx (hyperthyroidism)
Most common cause of hypothyroidism in iodine-sufficient areas
Hashimoto Thyroiditis
Anti-thyroid peroxidase, antithyroglobulin antibodies
Hashimoto Thyroiditis
HLA-DR5
Hashimoto Thyroiditis
Hurthle cells in germinal centers of thyroid tissue
Hashimoto Thyroiditis
Hashimoto Thyroiditis increase risk to what cancer?
non-Hodgkin Lymphoma
Cretinism
congenital hypothyroidism due to maternal hypothyroidisim, thyroid agenesis or dysgenesis, iodine deficiency
Pot-bellied, Pale, Puffy faced child with protruding Umbilicus, protuberant tongue and poor brain development
Cretinism (congenital hypothyroidism)
Self-limited hypothyroidsim following a flu-like illness
Subacute thyroiditis (de Quervain)
granulomatous inflammation of thyroid, hypothyroidism
Subacute thyroiditis (de Quervain)
tender thyroid, hypothyroidism
Subacute thyroiditis (de Quervain)
Thyroid replaced by fibrous tissue
Riedel Thyroiditis
hard, painless goiter
Riedel Thyroiditis
Mimicks anaplastic carcinoma
Riedel Thyroiditis
Hyperfunctioning follicular cells working independently of TSH due to mutation in TSH receptor
Toxic multinodular goiter (hyperthyroidism)
Jod-Basedow Phenomenon
thyrotoxicosis if a patient with iodine deficiency goiter is made iodine replete (Toxic multinodular goiter)
retro-orbital fibroblasts
Proptosis, extraocular muscle swelling - Graves Dx for hyperthyroidism
Scalloping of colloid thyroid
Grave’s Dx (hyperthyroidism)
Tx of Graves
Thioamide (block peroxidase), Radioiodine ablation, Beta-blockers
Autoantibodies (IgG) that stimulate TSH-R
Grave’s Dx (hyperthyroidism)
Stress-induces catecholamine surge seen as serious complicatino of Graves Disease
Thyroid Storm
agitation, delirium, fever, diarrhea, coma, increase ALP from increase bones turnover and tachycardia
Thyroid Storm
Tx of Thyroid Storm
Propranolol, Propyluracil, Prednisolone
Benign proliferation of thyroid follicles surrounded by a fibrous capsule
Follicular adenoma
4 Carcinomas that spread through the blood
Renal carcinoma - Renal Vein
Hepatocellular carcinoma - hepatic vein
Follicular carcinoma
Choriocarcinoma
Complications of Thyroid resection
Hoarseness - recurrent laryngeal
hypocalcemia - PTH removal
transectino of inferior thyroid artery
Orphan Annie Eyes
Papillary carcinoma of Thyroid (most common)
RET and BRAF mutations, childhood irradiation
Papillary carcinoma of Thyroid
Psammoma bodies, nuclear grooves, spreads to cervical nodes but excellent prognosis
Papillary carcinoma of Thyroid
Cancer from parafollicular C cells
medullary carcinoma of thyroid
Hypocalcemia, sheets of amyloid stroma associated wtih MEN2A and 2B
medullary carcinoma of thyroid
“Stones, bones, groans, and psychiatric overtones”
Primary HyperPTH
cystic bone spaces filled with brown fibrous tissue
Osteitis fibrosis cystica
Constipation, weakness, kidney stones, acute pancreatitis, depression
Primary HyperPTH
Bone lesions due to Secondary or tertiary HyperPTH
Renal Osteodystrophy
Causes of secondary hyperPTH
chronic renal disease, hypovitaminosis D, Hypocalcemia, hyperphosphatemia
Tetany
Hypocalcemia
Chvostek Sign
Tapping facial nerve (cheek) causes contraction of facial mucles, seen in hypoPTH, hypocalcemia
Trousseau Sign
Occlude Brachial Artery by BP cuff and get carpal spasm, seen in hypoPTH and hypocalcemia
Albright hereditary osteodystrophy
pseudohypoparathyroidism, autosomal dominant unresponsiveness of kidney to PTH
Hypocalcemia, shortened 4th/5thh digits, short stature
pseudohypoparathyroidism, Albright hereditary osteodystrophy
Mass effect
nonfunctional tumor, bitemporal hemianopsia hypopituitarism and HA
microadenoma
<1cm
macroadenoma
> 1cm
Tx of prolactinoma
dopamine agonist Bromocriptine or Cabergoline
Large Tongue, deep voice, large hands and feet, coarse facial features, insulin resistance
Acromegaly
Most common cause of death in Gigantism
Cardiac Failure
increased serum IGF-1, failure to suppress GH following oral glucose tolerance test
Acromegaly
Tx of Acromegaly
Octreotide (somatostatin analog) or Pegvisomant (GH-R antagonist) or pituitary resection
Intense thirst and polyuria with inability to concentrate urine due to lack of ADH
Diabetes Insipidus
Decreased ADH, No change with water restriction, do get change with desmopressin
Central DI
normal or increased ADH, no change with water restriction test, no response to DDAVP
Nephrogenic DI
Tx of Nephrogenic DI
HCTZ, indomethacin, amiloride, hydration
Tx of Central DI
DDAVP, hydration
Secondary to hypercalcemia and lithium and demeclocycline
Nephrogenic DI
Hyponatremia with continued urinary sodium excretion
SIADH
excessive water retention
SIADH
Correct SIADH slowly to prevent
Central Pontine Myelinolysis
Causes of SIADH
ectopic ADH like small cell lung cancer, CNA disorders/head trauma, pulmonary disease and cyclophosphamide
Tx of SIADH
fluid restriction, IV hypertonic saline, conivaptan, tolvaptan and demeclocycline (blocks ADH)
Ischemic infarct of pituitary following postpartum bleeding; failure to lactate
Sheehan Syndrome
Pituitary Apoplexy
bleeding into pituitary
Empty sella syndrome
atrophy or compression of pituitary, often idiopathic or obese women
Kimmelstiel-Wilson syndrome
Diabetic nephropathy (kidney disease) from chronic diabetes
Diabetic Osmotic Damage of certain cells
Schwann Cells - peripheral neuropathy
Pericytes of Retina BV - blindness
Lens - cataracts
All caused by increased glucose, aldose reductase turns into sorbitol
Autoimmune destruction of beta cella
Type IV HS, Type I diabetes mellitus
HLA-DR3 and 4
Type I diabetes mellitus
Islet leukocytic infiltrate
Type I DM
Islet amyloid polypeptide deposits
Type II DM
Ketoacidosis
More likely in Type I DM
Glucose Intolerance
Type I DM
rapid/deep breathing, delirium, dehydration, fruity breath
DKA
> 300mg/dL sugar, hyperK, acidosis
DKA
Mucormycosis (Rhizopus), Cerebral edema, HF
DKA complications
tx of DKA
IV fluids, insulin, and potassium
Lethargy, Syncope, Diplopia
Whipple Triad of episodic CNS symptoms from insulinoma (Hypoglycemia)
Random Glucose >200mg/dL
DM Type II
Glucose Tolerance test >200mg/dL 2hr after glucose load
DM Type II
Fasting Glucose >126mg/dL
DM Type II
Glucose >500mg/dL, hypotension and coma, no ketones
Hyperosmolar Non-Ketotic Coma, associated with Type II DM
Achlorhydria, Cholelithiasis and Steatorrhea
Somatostatinoma
Watery diarrhea, hypoK, anchlorhydria
VIPoma
High levels of 5-HT, recurrent diarrhea, cutaneous flushing, asthmatic wheezing and right sided valvular disease
Carcinoid Syndrome
Increased 5-HIAA in urine
Carcinoid Syndrome
Tx of Carcinoid Syndrome
resection of Octreotide (somatostatin analog)
Most common malignancy in the small intestine
Carcinoid Syndrome
Recurrent ulcers in distal duodenum and jejunum
ZE-syndrome
Pituitary, parathyroid, and Pancreas Tumors
MEN1 - Wermer Syndrome
Commonly present with kidney stones and stomach ulcers
MEN1 - Wermer Syndrome
Medullary thyroid carcinoma, Pheochromocytoma, parathyroid hyperplasia
MEN2A (Sipple Syndrome)
Medullary thyroid carcinoma, Pheochromocytoma, Oral/intestinal ganglioneuromatosis (mucosal neuromas),
MEN2B
Associated with Marfanoid Habitus
MEN2B
ret gene mutation
MEN2A and 2B
Drunk Drive Thru
Taco Bell