USMLE STEP 2 CK MEDICAL SUBJECT REVIEW: INTERNAL:
INFECTIOUS DISEASES UPDATED STUDY GUIDE QUESTIONS
AND CORRECT ANSWERS
During a routine X-ray examination for employment Aspergilloma
insurance purposes, the radiologist notices a rounded
lesion in a pulmonary cavity on the right upper lobe of
the pulmonary X-ray of a middle-aged man. The patient
was treated for pulmonary cavitary tuberculosis (TB) 2
years ago; he has completed treatment, and he has not
had any problems since. What late complication of TB is
seen in this patient?
36-year-old woman presents with vaginal discharge. Candida vaginitis
She has a history of itching and white discharge. She is
sexually active with her husband only. She takes oral
contraceptive pills for contraception, and she has never
been diagnosed with an STD (sexually transmitted
disease). On examination, the vagina is hyperemic and
covered with white cottage cheese-appearing
discharge. What is the most likely diagnosis?
,4-year-old boy presents with bloody stool and Stool culture
vomiting after 4 days of diarrhea, nausea, and low fever.
Over the past week, several children from the
neighborhood also suffered diarrhea after drinking
water from the neighborhood well. The rest of his
personal history is non-contributory. On examination,
he looks pale, fussy and lethargic, but he appears non-
toxic. His temperature is 37.8, and pulse is 135;
respirations are 30, and blood pressure is 96/45.
Oxygen saturation is 100. His height is 89 cm, and his
weight is 10 kg; BMI is 15.6 (49th percentile for his age).
His abdomen is flat, soft, and non-tender, with the liver
edge palpable 3cm below the RCM; the rest of the
examination is normal. Coagulation studies are normal.
Coombs test is negative, and the rest of laboratory
findings are bellow:
Test
Results
Range
Units
Red Cell Count
3.5
3.90 - 5.50
millions/mm3
Hematocrit
27
31 - 41
%
Hemoglobin
8
11.3 - 14.1
gm/dL
White Cell Count
16,000
5500 - 15500
mm3
Segmental
54
32 - 54
%
Lymphocytes
30
28 - 48
%
Bands
10
0 - 11
%
Eosinophils
4
0-3
%
Basophils
2
0-1
%
Platelets
75
250 - 450
,
INFECTIOUS DISEASES UPDATED STUDY GUIDE QUESTIONS
AND CORRECT ANSWERS
During a routine X-ray examination for employment Aspergilloma
insurance purposes, the radiologist notices a rounded
lesion in a pulmonary cavity on the right upper lobe of
the pulmonary X-ray of a middle-aged man. The patient
was treated for pulmonary cavitary tuberculosis (TB) 2
years ago; he has completed treatment, and he has not
had any problems since. What late complication of TB is
seen in this patient?
36-year-old woman presents with vaginal discharge. Candida vaginitis
She has a history of itching and white discharge. She is
sexually active with her husband only. She takes oral
contraceptive pills for contraception, and she has never
been diagnosed with an STD (sexually transmitted
disease). On examination, the vagina is hyperemic and
covered with white cottage cheese-appearing
discharge. What is the most likely diagnosis?
,4-year-old boy presents with bloody stool and Stool culture
vomiting after 4 days of diarrhea, nausea, and low fever.
Over the past week, several children from the
neighborhood also suffered diarrhea after drinking
water from the neighborhood well. The rest of his
personal history is non-contributory. On examination,
he looks pale, fussy and lethargic, but he appears non-
toxic. His temperature is 37.8, and pulse is 135;
respirations are 30, and blood pressure is 96/45.
Oxygen saturation is 100. His height is 89 cm, and his
weight is 10 kg; BMI is 15.6 (49th percentile for his age).
His abdomen is flat, soft, and non-tender, with the liver
edge palpable 3cm below the RCM; the rest of the
examination is normal. Coagulation studies are normal.
Coombs test is negative, and the rest of laboratory
findings are bellow:
Test
Results
Range
Units
Red Cell Count
3.5
3.90 - 5.50
millions/mm3
Hematocrit
27
31 - 41
%
Hemoglobin
8
11.3 - 14.1
gm/dL
White Cell Count
16,000
5500 - 15500
mm3
Segmental
54
32 - 54
%
Lymphocytes
30
28 - 48
%
Bands
10
0 - 11
%
Eosinophils
4
0-3
%
Basophils
2
0-1
%
Platelets
75
250 - 450
,
