Associations 5 Flashcards
Cause basophilic stippling
Lead poisoining
Thalassemia
Alcohol use
Anemia + neurological symptoms
Lead poisoning (microcytic) B12 deficiency (macrocytic)
Sickle cell + aplastic anemia crisis
Parvovirus B19
Pancytopenia with hypocellularity and fatty infiltrates on BM biopsy
Aplastic anemia
Thalassemia more prevalent in which races
Alpha - African and Asian
Beta - Mediterannean
βHair on endβ skull x-ray
BM hyperplasia in sickle cell disease
Salmonella osteomyelitis
Assoc w/ sickle cell disease
Encapsulated organisms
Strep pneumo H. influenzae N. meningitidis Klebsiella Salmonella
Complication of 10% sideroblastic anemia
Acute leukemia
Causes of eosinophilia
DNAAACP Drugs Neoplasms Allergies/asthma (Churg Strauss) AIN Adrenal insufficiency (Addisons) CVD Parasites
Type I hypersensitivity rxn
IgE / mast cell degranulation
Hives, pruritis, allergic rhinitis
Asthma, bronchospasm, angioedema
Anaphylaxis
Type II hypersensitivity rxn
Cell-mediated / Complement cascade / IgM and IgG react w/ cellular antigens Drug-induced or immune hemolytic anemia Hemolytic disease of the newborn Graves Myasthenia gravis ITP Acute rheumatic fever Goodpasture's Bullous pemphigoid Pemphigous vulgaris
Type III hypersensitiviy rxn
Immune complexes deposit in tissue and activate complement/ IgM and IgG bind soluble antigens
Arthus rxn
(serum sickness)
Glomerulonephritis
Type IV hypersensitivity rxn
Delayed / T-cell mediated
Transplant rejection
Contact dermatitis
PPD
von Willebrand disease
AD
vWF and sometimes factor VIII deficiency
+PTT and +BT (NORMAL platelet number)
Hemophilia
X-linked recessive
Factor VIII (A) or IX (B) deficiency
+PTT, normal PT/BT/platelet number
+Fibrin split products, +D-dimer
DIC
Common causes DIC
STOP Making Thrombi Sepsis Trauma (including surgery) Ob complications Pancreatitis Malignancy Transfusions
MC inherited hypercoagulability disorder
Factor V Leiden mutation (40-50%)
SIRS criteria
2/4 for diagnosis
Temp >38.3 or 90
RR >20 or PaCO2 12K or 10% bands
Sepsis
SIRS = 2/4 criteria
Sepsis = SIRS + infection
Septic shock = Sepsis + hypotension
MCC malaria
Plasmodium falciparum
Common areas for malaria
Sub-Saharan Africa
SW/SE Asia (India)
Tropical S. America
India ink stain
Stain of CSF = cryptococcal meningitis
HIV + purple subcutaneous nodules or hemoptysis
Kaposi sarcoma (HHV-8) skin or lung lesions
HIV + diarrhea
Isospora, strongyloides
Cryptosporidium
HIV + Cough, fever, dyspnea
CD4 <200, non-productive cough: PCP
Acid-fast bacilli: TB
HIV + ataxia, apathy, tremor, intellectual decline
AIDS dementia, CD4 <100
HIV + odynophagia
Candida esophagitis
CD4 <200, gram stain on lesion scrapings
HIV + fever, weight loss, fatigue, abdominal pain, GI bleeding, skin lesions, dyspnea, meningitis or adrenal insufficiency
Histoplasmosis
CD4 <150
Bilateral infiltrates on CXR, positive serum/urine antigen
HIV + focal neurologic symptoms, HA, AMS
CD4 <50: Cryptococcal meningitis
HIV + vision loss, esophagitis, cellulitis, ulcers
CMV
CD4 <50, yellow infiltrates + hemorrhage on fundoscopy, viral titer to confirm
HIV + fatigue, weight loss, fever, diarrhea, abdominal pain, hepatosplenomegaly
MAC
CD4 <50, blood cultures
Thrombosis + erythromelalgia + pruritis (esp after warm bath)
Polycythemia vera (also facial plethora, hepatosplenomegaly, visual disturbances, tinnitus)
CRAB symptoms hyperCalcemia Renal insufficiency Anemia Back pain
Multiple myeloma
Bence Jones proteins
Multiple myeloma (UPEP)
M spike on SPEP
Multiple myeloma
Painless cervical lymphadenopathy
Hodgkin lymphoma
MC type Hodgkin lymphoma
Nodular sclerosis (men = women)
MC lymphoma in US
Diffuse large B cell (NHL)
EBV related lymphoma (Africa)
Burkitt (NHL)
Reed-Sternberg cells on LN biopsy
Hodgkin lymphoma
βStarry skyβ pattern
Burkitt lymphoma (NHL)
T cell lymphoma
Peripheral (NHL)
14:18 translocation
Follicular small cell lymphoma (NHL)
8:14 translocation
Burkitt lymphoma (NHL)
B symptoms in lymphomas
Fever, night sweats, weight loss
Cleaved cells in LN biopsy
Follicular small cell lymphoma (NHL)
MC cancer in children
ALL
Pancytopenia in Down syndrome patient
ALL
Aeur rods + notched nuclei
AML
Smudge cells
CLL
BM biopsy w/ abundant blasts, +PAS, +tdt
ALL
Leukemia + bone pain
ALL
BM biopsy w/ abundant blasts, -PAS, +myeloperoxidase
AML
WBC > 50-100K
CML or CLL
Leukemia and lymphoma that are same disease
CLL and small lymphocytic lymphoma
Progresses to fatal blast crisis
CML
Leukemia in adults >65
CLL
Leukemia in adults 50-60
AML, CML
Numerous lymphocytes with irregular cytoplasmic projections
Hairy cell leukemia
t 9:22
Philadelphia chromosome (BCR-ABL)
CML
15% adult ALL (5% ALL overall), rare in AML
Short stature + abnormal skin pigmentation + horseshoe kidney + thumb abnormalities + fatigue + infections + pancytopenia on labs
Fanconi anemia (autosomal recessive)
Fatigue + dyspnea + craniofacial and thumb abnormalities + heart murmur + MR + hypogonadism + decreased Hgb/Hct but normal WBC/plt
Diamond-Blackfan anemia (congenital)
HTN + abdominal pain + diarrhea with no hematuria in kid: next step?
Neuroblastoma (check VMA and homovanillic acid in 24 hr urine; then CT)
Mass in soft tissue/muscle in child: next step?
Rhabdomyosarcoma (MC soft tissue sarcoma in children) (CT/MRI to see extent, biopsy afterwards is diagnostic)
Fall on outstretched hand
Colles fx
Fall on flexed wrist
Smith fx
Fall on outstretched hand, snuffbox tenderness
Scaphoid fx
Pain in hand after punching hard surface
Boxer fx (5th metacarpal)
Radial head dislocation w/ ulnar fx
Monteggia fx
Ulnar dislocation (DRUJ) w/ radial fx
Galeazzi fx
Complication of scaphoid fx
AVN
Complication of anterior shoulder dislocation
Axillary nerve injury
Complication of boxer fx
Infection, tendon laceration
Complication of humerus fx
Radial nerve injury
Complication of hip fx
AVN
Complication of femur fx
Fat embolism, blood loss
Complication of tibial fx
Compartment syndrome
Complication of pelvic fx
Hypovolemic shock (massive blood loss)
6Ps of compartment syndrome
Pain, Pallor, Poikilothermia, Pulselessness, Paresthesia, Paralysis
Unhappy triad
ACL + MCL + lateral meniscus
Hat doesnβt fit anymore
Pagetβs disease of bone (much more common; bone scan)
Osteopetrosis (anemia; X-ray)
Blue sclerae
Osteogenesis imperfecta
Sudden severe pain and swelling in one joint (first MTP, ankle, foot, knee MC)
Gout
Sudden severe pain and swelling in one joint (ankle, wrist MC)
Pseudogout
Needle-shaped negatively birefringent crystals (yellow)
Gout
Rhomboid-shaped positively birefringent crystals (blue)
Pseudogout
MCC septic arthritis
S. aureus
N. gonorrhea in young, sexually active
Joint aspirate w/ <2000 WBC
Osteoarthritis
Trauma
Joint aspirate w/ 5-50,000 WBC
Inflammatory (RA, gout, pseudogout, etc)
Joint aspirate w/ >50,000 WBC
Septic joint
MCC osteomyelitis
S. aureus
Consider Salmonella in sickle cell
Consider Pseudomonas in IVDU, old tennis shoe/nail
Radiology for osteomyelitis
MRI most useful
Erythema chronicum migrans
Lyme disease
B/L Bellβs palsy
Think Lyme disease
Heberden nodes
Osteoarthritis, DIP joints
Bouchard nodes
Osteoarthritis, PIP joints
MC adult bone tumor
Metastases
Lung = lytic, Prostate = blastic, Breast = both; Thyroid, Lymphoma, RCC
MC primary malignant bone tumor
Osteosarcoma
MC benign bone tumor
Osteochondroma
Sunburst bone lesion +/- Codmanβs triangle
Osteosarcoma (more common in adolescents)
Codman = new periosteal bone formation at diaphyseal end of lesion
Onion skin lesion +/- Codmanβs triangle
Ewing sarcoma (5-15 yo) (Codman = new periosteal bone formation at diaphyseal end of lesion)
Complications of scleroderma
Pulmonary fibrosis
Heart failure
ARF from renal hypertension
Complications of polymyositis and dermatomyositis
Interstitial lung disease
Increased risk of several malignancies
Associated w/ polymyalgia rheumatica
Temporal arteritis
Positive Barlow or Ortalani maneuver
Developmental hip dysplasia
Positive Galeazzi sign
Developmental hip dysplasia (knees at unequal heights when hips and knees are flexed)
Radiology to dx developmental hip dysplasia
Ultrasound (X-ray not useful until >4 months)
JIA w/ <4 joints and uveitis or iridocyclintis
Pauciarticular
JIA w/ >4 joints, symmetric, and hand deformities
Polyarticular
JIA w/ systemic symptoms usu before joint pain
Systemic (Stillβs disease)
MC fracture in children
Clavicular
Difficulty walking + Gower maneuver + calf pseudohypertrophy
Duchenne muscular dystrophy (x-linked)
MCC cellulitis
S. aureus, GAS (pyrogenes)
Apocrine gland inflammation (axilla, groin, perineum)
Hirdradenitis suppurativa
S/Sx necrotizing fasciitis
Extreme pain w/o cellulitis or outside borders
Erythema + bulla or blisters
Crepitus
DM w/ foot ulcer w/ systemic symptoms
Perineal cellulitis w/ abrupt onset and rapid spread (Fournierβs gangrene)
Dry gangrene cause, s/sx
Gradual skin necrosis from vascular insufficiency
Ache/cold/pallor -> bluish/black/hard/dry
Wet gangrene cause, s/sx
Necrosis from infection or acute vascular obstruction
Bruised, swollen, blistering, +pus
Gas gangrene cause, s/sx
C. perfringens
Pale/swelling around injury -> dark purplish-red, tense, tender, +crepitus w/ systemic symptoms
Yellow crusted lesion around mucocutaneous surfaces
Impetigo
Causes of impetigo
S. aureus, GAS (pyrogenes)
Cause of necrotizing fasciitis
GAS (pyrogenes) or multiple pathogens
Herpes simplex virus types
HSV 1 - oral ulcers
HSV 1 - genital ulcers
(herpes zoster) - VZV
Tzanck smear
Finds multi-nucleated giant cells on sample of lesion in HSV or VZV
Teardrop vesicles
Chicken pox (VZV)
Grouped vesicles
Shingles (VZV) or HSV
Temporal lobe encephalitis
Herpes (esp newborn)
Complications of VZV
Adult PNA, encephalitis
Newborn varicella
Myalgia, malaise, HA, fever proceeding to lesions in
Chicken pox (VZV)
HPV types
1-4 - skin warts
6, 11 - genital warts
16, 18, 31, 33 - cervical cancer
Painless, small, shiny/pearly, flesh colored papules w/ central umbilication
Molluscum contagiosum
Macules that do not tan w/ βspaghetti and meatballsβ on KOH prep (short hyphae + spores)
Tinea versicolor / Pityriasis versicolor
Malassezia furfur
Irritant rash vs intertrigo (candida albicans)
Intertrigo MC in skin creases, irritant usu avoids
Intertrigo can have βsatelliteβ lesions away from rash
Intertrigo KOH prep has pseudohyphae
Infectious causes of EM/SJS/TEN
HSV and Mycoplasma pneumonia
Drug causes of EM/SJS/TEN
Penicillins, sulfonamides
NSAIDs
OCPs
Anticonvulsant medications
EM vs SJS vs TEN
EM = mild disease, macules, plaques, vesicles, target lesions, esp palms/soles SJS = EM involving mucous membranes, skin sloughing 30% surface area
Pruritic, erythematous plaques w/ yellow, greasy scales most commonly on face or scalp
Seborrheic dermatitis (or cradle cap in babies)
Dry skin patches w/ papules most commonly on flexor surfaces, face/scalp in infants
Atopic dermatitis (eczema)
Well-defined red plaques w/ silvery scales on extensor surfaces that bleed easily w/ scale removal (Auspitz sign)
Psoriasis
Herald patch + pruritic papules covered with white scale in βchristmas treeβ pattern
Pityriasis rosea
Subcutaneous fat inflammation -> painful, erythematous nodules esp on anterior tibias
Erythema nodosum
Conditions associated w/ erythema nodosum
SPUD BITS Strep infections Pregnancy Unknown/idiopathic Drugs Behcet's IBD TB Sarcoidosis
Pruritic, purple, polygonal papules and plaques that are shiny and flat, most commonly on flexor surfaces of extremities, possibly on mucus membranes/genitals
Lichen Planus
Infections associated w/ lichen planus
HIV (younger patients) Hep C (older patients)
Decubitus ulcer stages
I - color/consistency/temp change of skin
II - superficial skin abrasion, shallow crater
III - full thickness skin loss + SQ damage, deep crater
IV - muscle, bone or supporting structure damage
Eczematous dermatitis w/ inflammatory papules, scaly and crusted erosions, increased pigmentation, stippling w/ recent and old hemorrhages, possible ulceration
Stasis dermatitis
Flaccid, easily ruptured bullae (+Nikolsky sign) w/ oral lesions
Pemphigus vulgaris (anti-desmosome Abs)
Tense, hard, difficult to rupture bullae w/o oral lesions
Bullous pemphigoid (anti-hemidesmosome Ab)
Chronic blistering lesions on sun-exposed skin
Porphyria cutanea tarda
Porphyria cutanea tarda associations
Hep C, alcoholism
Iron overload, estrogen use, smoking
Pigmented plaques that appear to be stuck onto skin
Seborrheic keratosis
Black velvety plaques on flexor surfaces, body folds
Acanthosis nigricans
Acanthosis nigricans associated with what
Obesity
DM
Malignancies
Rough lesions on sun-exposed skin that are easier to feel than see
Actinic keratosis
Circular rash w/ central clearing on trunk/arms
Tinea corporis
Sharply demarcated patches of hypopigmentation
Vitiligo
Hyperpigmentation in pregnancy
Melasma
Vitiligo associated comorbidities
Thyroid disease (30%) - Graves, AI Pernicious anemia, DM I, primary adrenal insufficiency, hypopituitarism, alopecia areata, AI hepatitis
Asymptomatic, inflammatory, non-scarring areas of complete hair loss
Alopecia areata
Stress-related diffuse hair loss
Telogen effluvium
Male-pattern baldness (men or women)
Androgenic alopecia