A 3-year-old girl presents with fever and a limp. X-ray shows a lytic lesion in the tibia. Most likely diagnosis is:

Questions 56

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Question 1 of 9

A 3-year-old girl presents with fever and a limp. X-ray shows a lytic lesion in the tibia. Most likely diagnosis is:

Correct Answer: B

Rationale: Ewing sarcoma presents with fever, limp, and lytic lesions, per NCI. A, C-E differ in imaging or history.

Question 2 of 9

A 2-month-old infant presents with poor feeding and a murmur. Echocardiogram shows pulmonary stenosis. The next step is:

Correct Answer: B

Rationale: Balloon valvuloplasty relieves pulmonary stenosis, per AHA. A, C-E depend on severity.

Question 3 of 9

At a well-child visit, the parents of a 2 month old ask the nurse about the bright red elevated area on the infant's face that appeared a few weeks after birth. Which of the following skin lesions does the nurse recognize this skin lesion to be?

Correct Answer: B

Rationale: A strawberry nevus (B), a hemangioma, is a red, elevated lesion appearing postnatally. Port wine (A) is flat, intertrigo (C) is irritation, and exanthem (D) is a rash. Document: 'The strawberry nevus… may not become apparent for a few weeks after birth.'

Question 4 of 9

A 4-year-old boy presents with abdominal pain and bloody stools. Ultrasound shows intussusception. The next step is:

Correct Answer: C

Rationale: Air enema reduces intussusception, per AAP. A, B, D, E are secondary.

Question 5 of 9

A child with a history of cystic fibrosis appears with abdominal pain and vomiting. Physical examination reveals a palpable mass in the right lower quadrant. Most likely diagnosis is:

Correct Answer: C

Rationale: Distal intestinal obstruction syndrome fits abdominal pain, vomiting, and a mass in cystic fibrosis, per CFF. A, B, D, E are less likely.

Question 6 of 9

A child appears with metabolic acidosis. Basic laboratory tests should include all of the following except:

Correct Answer: D

Rationale: Liver enzymes aren’t routine for initial metabolic acidosis workup; A-C, E assess cause and severity (AAP).

Question 7 of 9

When completing a thorough health history on a child with gastrointestinal issues the nurse knows that it is important to ask which of the following questions related to gastrointestinal health? Select one that does not apply.

Correct Answer: C

Rationale: Diet , bowel habits , and pica directly relate to GI health. Pets and firearms are unrelated unless zoonotic infection is suspected.

Question 8 of 9

Which of the following findings would be suggestive of a tracheoesophageal fistula in a newborn?

Correct Answer: C

Rationale: Choking during the first feeding (C) suggests tracheoesophageal fistula due to abnormal trachea-esophagus connection. Meconium delay (A), peristalsis (B), and masses (D) are unrelated. Document: 'A newborn with tracheoesophageal fistula will vomit and choke when the first feeding is introduced.'

Question 9 of 9

Phosphorus moves into the intracellular space resulting in hypophosphatemia in the following condition:

Correct Answer: C

Rationale: Respiratory alkalosis shifts phosphorus intracellularly due to alkalemia, lowering serum levels (UpToDate). Acidosis (A, D) shifts it out, and B, E have minimal effect.

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