NR511 MIDTERM EXAM:
DIFFERENTIAL DIAGNOSIS &
PRIMARY CARE PRACTICUM
QUESTIONS AND VERIFIED ANSWERS
|GRADE A+| JUST RELEASED.
CHAMBERLAIN
1. A 24-year-old female presents with a ‘herald patch’ followed by a Christmas tree pattern
rash on her back. What is the most likely diagnosis?
A. Tinea Corporis
B. Secondary Syphilis
C. Guttate Psoriasis
D. Pityriasis Rosea
Answer: D
Conceptual Explanation: Pityriasis Rosea typically begins with a single ‘herald patch’
followed by a generalized eruption in a Christmas tree distribution along skin tension lines.
,2. When evaluating a diagnostic test, the proportion of people with a disease who have a
positive test result is known as:
A. Specificity
B. Sensitivity
C. Positive Predictive Value
D. Negative Predictive Value
Answer: B
Conceptual Explanation: Sensitivity refers to the ability of a test to correctly identify
those with the disease (true positive rate).
3. A patient presents with ear pain. On exam, there is pain when the pinna is tugged and the
canal is erythematous and edematous. The tympanic membrane is poorly visualized but
appears intact. Diagnosis?
A. Acute Otitis Media
B. Otitis Externa
C. Otitis Media with Effusion
D. Mastoiditis
Answer: B
Conceptual Explanation: Pain with tragus or pinna movement (positive tug sign) and
canal inflammation are classic indicators of Otitis Externa.
, 4. Which of the following is considered a ‘Red Flag’ in a patient presenting with acute low
back pain?
A. Pain that worsens with movement
B. History of smoking
C. Age between 30 and 50
D. Unexplained weight loss and history of cancer
Answer: D
Conceptual Explanation: Systemic symptoms such as weight loss and a history of cancer
raise suspicion for malignancy or infection, which are red flags in back pain evaluation.
5. According to the Centor Criteria, which of the following clinical features is NOT used to
determine the likelihood of Group A Beta-Hemolytic Streptococcus (GABHS)?
A. History of fever
B. Tonsillar exudates
C. Presence of cough
D. Tender anterior cervical adenopathy
Answer: C
Conceptual Explanation: The Centor Criteria includes fever, tonsillar exudates, tender
anterior cervical lymphadenopathy, and the absence of cough. A cough suggests a viral
etiology.
DIFFERENTIAL DIAGNOSIS &
PRIMARY CARE PRACTICUM
QUESTIONS AND VERIFIED ANSWERS
|GRADE A+| JUST RELEASED.
CHAMBERLAIN
1. A 24-year-old female presents with a ‘herald patch’ followed by a Christmas tree pattern
rash on her back. What is the most likely diagnosis?
A. Tinea Corporis
B. Secondary Syphilis
C. Guttate Psoriasis
D. Pityriasis Rosea
Answer: D
Conceptual Explanation: Pityriasis Rosea typically begins with a single ‘herald patch’
followed by a generalized eruption in a Christmas tree distribution along skin tension lines.
,2. When evaluating a diagnostic test, the proportion of people with a disease who have a
positive test result is known as:
A. Specificity
B. Sensitivity
C. Positive Predictive Value
D. Negative Predictive Value
Answer: B
Conceptual Explanation: Sensitivity refers to the ability of a test to correctly identify
those with the disease (true positive rate).
3. A patient presents with ear pain. On exam, there is pain when the pinna is tugged and the
canal is erythematous and edematous. The tympanic membrane is poorly visualized but
appears intact. Diagnosis?
A. Acute Otitis Media
B. Otitis Externa
C. Otitis Media with Effusion
D. Mastoiditis
Answer: B
Conceptual Explanation: Pain with tragus or pinna movement (positive tug sign) and
canal inflammation are classic indicators of Otitis Externa.
, 4. Which of the following is considered a ‘Red Flag’ in a patient presenting with acute low
back pain?
A. Pain that worsens with movement
B. History of smoking
C. Age between 30 and 50
D. Unexplained weight loss and history of cancer
Answer: D
Conceptual Explanation: Systemic symptoms such as weight loss and a history of cancer
raise suspicion for malignancy or infection, which are red flags in back pain evaluation.
5. According to the Centor Criteria, which of the following clinical features is NOT used to
determine the likelihood of Group A Beta-Hemolytic Streptococcus (GABHS)?
A. History of fever
B. Tonsillar exudates
C. Presence of cough
D. Tender anterior cervical adenopathy
Answer: C
Conceptual Explanation: The Centor Criteria includes fever, tonsillar exudates, tender
anterior cervical lymphadenopathy, and the absence of cough. A cough suggests a viral
etiology.
