WBR0769: Difference between revisions
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|MainCategory=Pathology | |MainCategory=Pathology | ||
|SubCategory=Dermatology | |SubCategory=Dermatology | ||
|MainCategory=Pathology | |||
|MainCategory=Pathology | |MainCategory=Pathology | ||
|MainCategory=Pathology | |MainCategory=Pathology | ||
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|Prompt=A 14 year old boy is brought by his mother to the physician's office for pruritic lesions on his skin. The mother informs the physician that the child just recently returned from a picnic and had been exposed to poison ivy plants. On physical examination, the physician notes vesicular bullous lesions with erythema on the lower extremities. The patient's condition is best characterized by a hypersensitivity disorder that resembles which other disease? | |Prompt=A 14 year old boy is brought by his mother to the physician's office for pruritic lesions on his skin. The mother informs the physician that the child just recently returned from a picnic and had been exposed to poison ivy plants. On physical examination, the physician notes vesicular bullous lesions with erythema on the lower extremities. The patient's condition is best characterized by a hypersensitivity disorder that resembles which other disease? | ||
|Explanation=The patient is presenting with contact dermatitis following exposure to poison ivy, a common allergen. Contact dermatitis is caused by a type IV (delayed) hypersensitivity reaction. Similarly, multiple sclerosis is also caused by a type IV hypersensitivity disorder. Other diseases that are also implicated in this type of disorder are: Guillain-Barre syndrome, graft-vs-host disease, and PPD testing for Mycobacterium tuberculosis. | |Explanation=The patient is presenting with contact dermatitis following exposure to poison ivy, a common allergen. Contact dermatitis is caused by a type IV (delayed) hypersensitivity reaction. Similarly, multiple sclerosis is also caused by a type IV hypersensitivity disorder. Other diseases that are also implicated in this type of disorder are: Guillain-Barre syndrome, graft-vs-host disease, and PPD testing for Mycobacterium tuberculosis. | ||
|AnswerA=Pernicious anemia | |AnswerA=Pernicious anemia | ||
|AnswerAExp=Pernicious anemia is a type II hypersensitivity disorder. | |AnswerAExp=Pernicious anemia is a type II hypersensitivity disorder. | ||
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|AnswerE=Poststreptococcal glomerulonephritis (PSGN) | |AnswerE=Poststreptococcal glomerulonephritis (PSGN) | ||
|AnswerEExp=PSGN is a caused by a type III hypersensitivity disorder. | |AnswerEExp=PSGN is a caused by a type III hypersensitivity disorder. | ||
|EducationalObjectives=Contact dermatitis and multiple sclerosis are both caused by a type IV hypersensitivity disorder. | |||
|References=First Aid 2014 page 208-209 | |||
|RightAnswer=B | |RightAnswer=B | ||
|WBRKeyword= | |WBRKeyword=Multiple sclerosis, Type III hypersensitivity, Hypersensitivity disorder, Hypersensitivity, Dermatitis, Irritant, Allergic, Allergy, Atopic, Atopy | ||
|Approved= | |Approved=Yes | ||
}} | }} | ||
Revision as of 00:22, 31 August 2014
| Author | [[PageAuthor::Rim Halaby, M.D. [1]]] |
|---|---|
| Exam Type | ExamType::USMLE Step 1 |
| Main Category | MainCategory::Pathology |
| Sub Category | SubCategory::Dermatology |
| Prompt | [[Prompt::A 14 year old boy is brought by his mother to the physician's office for pruritic lesions on his skin. The mother informs the physician that the child just recently returned from a picnic and had been exposed to poison ivy plants. On physical examination, the physician notes vesicular bullous lesions with erythema on the lower extremities. The patient's condition is best characterized by a hypersensitivity disorder that resembles which other disease?]] |
| Answer A | AnswerA::Pernicious anemia |
| Answer A Explanation | AnswerAExp::Pernicious anemia is a type II hypersensitivity disorder. |
| Answer B | AnswerB::Multiple sclerosis (MS) |
| Answer B Explanation | AnswerBExp::MS is caused by a type IV hypersensitivity disorder. |
| Answer C | AnswerC::Systemic lupus erythematosus (SLE) |
| Answer C Explanation | AnswerCExp::SLE is caused by a type III hypersensitivity disorder. |
| Answer D | AnswerD::Atopic dermatitis |
| Answer D Explanation | AnswerDExp::Eczema or atopic dermatitis is caused by a type I hypersensitivity disorder. |
| Answer E | AnswerE::Poststreptococcal glomerulonephritis (PSGN) |
| Answer E Explanation | AnswerEExp::PSGN is a caused by a type III hypersensitivity disorder. |
| Right Answer | RightAnswer::B |
| Explanation | [[Explanation::The patient is presenting with contact dermatitis following exposure to poison ivy, a common allergen. Contact dermatitis is caused by a type IV (delayed) hypersensitivity reaction. Similarly, multiple sclerosis is also caused by a type IV hypersensitivity disorder. Other diseases that are also implicated in this type of disorder are: Guillain-Barre syndrome, graft-vs-host disease, and PPD testing for Mycobacterium tuberculosis. Educational Objective: Contact dermatitis and multiple sclerosis are both caused by a type IV hypersensitivity disorder. |
| Approved | Approved::Yes |
| Keyword | WBRKeyword::Multiple sclerosis, WBRKeyword::Type III hypersensitivity, WBRKeyword::Hypersensitivity disorder, WBRKeyword::Hypersensitivity, WBRKeyword::Dermatitis, WBRKeyword::Irritant, WBRKeyword::Allergic, WBRKeyword::Allergy, WBRKeyword::Atopic, WBRKeyword::Atopy |
| Linked Question | Linked:: |
| Order in Linked Questions | LinkedOrder:: |