ClassicPresentations Flashcards
Gout, intellectual disability, self-mutilating behavior in a boy
Lesch-Nyhan syndrome (HGPRT deficiency, X-linked recessive)
Situs inversus, chronic ear infections, sinusitis, bronchiectasis, infertility
Primary ciliary dyskinesia or Kartagener syndrome (dynein arm defect affecting cilia)
Blue sclera, multiple fractures, dental problems, conductive hearing loss
Osteogenesis imperfecta (type I collagen defect)
Elastic skin, hypermobility of joints, bleeding tendency
Ehlers-Danlos syndrome (type V collagen defect, type III collagen defect seen in vascular subtype of ED)
Arachnodactyly, lens dislocation (upward and temporal), aortic dissection, hyperflexible joints
Marfan syndrome (fibrillin defect)
Arachnodactyly, pectus deformity, lens dislocation (downward)
Homocystinuria (autosomal recessive)
Café-au-lait spots (unilateral), polyostotic fibrous dysplasia, precocious puberty, multiple endocrine abnormalities
McCune-Albright syndrome (Gs-protein activating mutation)
Meconium ileus in neonate, recurrent pulmonary infections, nasal polyps, pancreatic insufficiency, infertility/subfertility
Cystic fibrosis (CFTR gene defect, chromosome 7, ∆F508)
Calf pseudohypertrophy
Muscular dystrophy (most commonly Duchenne, due to X-linked recessive frameshift mutation of dystrophin gene)
Child uses arms to stand up from squat
Duchenne muscular dystrophy (Gowers sign)
Slow, progressive muscle weakness in boys
Becker muscular dystrophy (X-linked non-frameshift deletions in dystrophin; less severe than Duchenne)
Infant with cleft lip/palate, microcephaly or holoprosencephaly, polydactyly, cutis aplasia
Patau syndrome (trisomy 13)
Infant with microcephaly, rocker-bottom feet, clenched hands, and structural heart defect
Edwards syndrome (trisomy 18)
Single palmar crease, intellectual disability
Down syndrome
Microcephaly, high-pitched cry, intellectual disability
Cri-du-chat (cry of the cat) syndrome
Confusion, ophthalmoplegia/nystagmus, ataxia
Wernicke encephalopathy (add confabulation/memory loss for Korsakoff syndrome)
Dilated cardiomyopathy/high-output heart failure, edema, alcoholism or malnutrition
Wet beriberi (thiamine [vitamin B1] deficiency)
Burning feet syndrome
Vitamin B5 deficiency
Dermatitis, dementia, diarrhea
Pellagra (niacin [vitamin B3] deficiency)
Swollen gums, mucosal bleeding, poor wound healing, petechiae, corkscrew hairs
Scurvy (vitamin C deficiency: can’t hydroxylate proline/ lysine for collagen synthesis); tea and toast diet
Bowlegs (children), bone pain, and muscle weakness
Rickets (children), osteomalacia (adults); vitamin D deficiency
Hemorrhagic disease of newborn with PT, aPTT
Vitamin K deficiency
Intellectual disability, musty body odor, hypopigmented skin, eczema
Phenylketonuria
Bluish-black connective tissue, ear cartilage, sclerae; urine turns black on prolonged exposure to air
Alkaptonuria (homogentisate oxidase deficiency; ochronosis)
Myopathy (infantile hypertrophic cardiomyopathy), exercise intolerance
Pompe disease (lysosomal α-1,4-glucosidase deficiency)
Infant with hypoglycemia, hepatomegaly
Cori disease (debranching enzyme deficiency) or Von Gierke disease (glucose-6-phosphatase deficiency, more severe)
Chronic exercise intolerance with myalgia, fatigue, painful cramps, myoglobinuria
McArdle disease (skeletal muscle glycogen phosphorylase deficiency)
“Cherry-red spots” on macula
Tay-Sachs (ganglioside accumulation; no hepatosplenomegaly); Niemann-Pick disease (sphingomyelin accumulation; hepatosplenomegaly); central retinal artery occlusion
Hepatosplenomegaly, pancytopenia, osteoporosis, avascular necrosis of femoral head, bone crises
Gaucher disease (glucocerebrosidase [β-glucosidase] deficiency)
Achilles tendon xanthoma
Familial hypercholesterolemia ( LDL receptor signaling)
Recurrent Neisseria infection
Terminal complement deficiencies (C5-C9)
Male child, recurrent infections, no mature B cells
Bruton disease (X-linked agammaglobulinemia)
Anaphylaxis following blood transfusion
IgA deficiency
Recurrent cold (noninflamed) abscesses, eczema, high serum IgE, eosinophils
Hyper-IgE syndrome (Job syndrome: neutrophil chemotaxis abnormality)
Late separation (>30 days) of umbilical cord, no pus, recurrent skin and mucosal bacterial infections
Leukocyte adhesion deficiency (type 1; defective LFA-1 integrin)
Recurrent infections and granulomas with catalase ⊕ organisms
Chronic granulomatous disease (defect of NADPH oxidase)
Fever, vomiting, diarrhea, desquamating rash following use of nasal pack or tampon
Staphylococcal toxic shock syndrome
“Strawberry tongue”
Scarlet fever (sandpaper rash); Kawasaki disease (lymphadenopathy, high fever for 5 days)
Colon cancer associated with infective endocarditis
Streptococcus bovis
Flaccid paralysis in newborn after ingestion of honey
Clostridium botulinum infection (floppy baby syndrome)
Abdominal pain, diarrhea, leukocytosis, recent antibiotic use
Clostridioides difficile infection
Tonsillar pseudomembrane with “bull’s neck” appearance
Corynebacterium diphtheria infection
Back pain, fever, night sweats
Pott disease (vertebral TB)
Adrenal insufficiency, fever, DIC (Disseminated Intravascular Coagulation)
Waterhouse-Friderichsen syndrome (meningococcemia)
Red “currant jelly” sputum in patients with alcohol overuse or diabetes
Klebsiella pneumoniae pneumonia
Large rash with bull’s-eye appearance
Erythema migrans from Ixodes tick bite (Lyme disease: Borrelia)
Ulcerated genital lesion
Nonpainful, indurated: chancre (1° syphilis, Treponema pallidum) Painful, with exudate: chancroid (Haemophilus ducreyi)
Smooth, moist, painless, wartlike white lesions on genitals
Condylomata lata (2° syphilis)
Pupil accommodates but doesn’t react to light
Neurosyphilis (Argyll Robertson pupil)
Fever, chills, headache, myalgia following antibiotic treatment for syphilis
Jarisch-Herxheimer reaction (due to host response to sudden release of bacterial antigens)
Dog or cat bite resulting in infection (cellulitis, osteomyelitis)
Pasteurella multocida (cellulitis at inoculation site)
Atypical “walking pneumonia” with x-ray looking worse than the patient
Mycoplasma pneumoniae infection
Rash on palms and soles
Coxsackie A, 2° syphilis, Rocky Mountain spotted fever
Black eschar on face of patient with diabetic ketoacidosis and/or neutropenia
Mucor or Rhizopus fungal infection
Chorioretinitis, hydrocephalus, intracranial calcifications
Congenital toxoplasmosis
Pruritus, serpiginous rash after walking barefoot
Hookworm (Ancylostoma spp, Necator americanus)
Child with fever later develops red rash on face that spreads to body
Erythema infectiosum/fifth disease (“slapped cheeks” appearance, caused by parvovirus B19)
Fever, cough, conjunctivitis, coryza, diffuse rash
Measles
Small, irregular red spots on buccal/lingual mucosa with blue-white centers
Koplik spots (measles [rubeola] virus)
Bounding pulses, wide pulse pressure, diastolic heart murmur, head bobbing
Aortic regurgitation
Systolic ejection murmur (crescendo-decrescendo), narrow pulse pressure, pulsus parvus et tardus
Aortic stenosis
Continuous “machinelike” heart murmur
PDA (close with indomethacin; keep open with PGE analogs)