Childhood primary brain stem tumors are a heterogeneous group of tumors; the outcome usually depends on the tumor location. Which tumor, depending on the site of tumor, carries the worst prognosis?

Correct Answer: D

Rationale: Diffuse intrinsic pontine gliomas (DIPG) have the worst prognosis among brainstem tumors.

Correct Answer: A

Rationale: Kidney involvement due to amyloid deposition is the most serious complication in FMF.

Correct Answer: B

Rationale: Choice B directly assesses the child's community mobility by inquiring about their ability to leave the house and engage in play activities with friends. Community mobility involves the child's independence in social and recreational activities outside the home, making this question crucial for understanding their daily functioning and autonomy.

Correct Answer: A

Rationale: Glucocorticoids are contraindicated in the treatment of a patient with systemic fungal infection or in patients receiving live vaccines due to their immunosuppressive effects. Glucocorticoids can exacerbate fungal infections by suppressing the immune response. While caution is advised in patients with diabetes mellitus, myasthenia gravis, and glaucoma, the presence of a systemic fungal infection warrants questioning the use of glucocorticoids to prevent worsening of the fungal infection.

Correct Answer: C

Rationale: A pneumothorax presents with acute respiratory distress, asymmetrical breath sounds, and increased transillumination on the affected side. It occurs due to alveolar rupture, often in ventilated preterm infants with underlying lung disease.

Correct Answer: B

Rationale: The first step toward effective cancer control is changing habits and customs that predispose individuals to cancer. Prevention is key in reducing the incidence of cancer. By addressing factors like smoking, poor diet, lack of physical activity, excessive alcohol consumption, and exposure to carcinogens in the environment, the risk of developing cancer can be significantly reduced. Education and awareness play a crucial role in encouraging individuals to adopt healthier lifestyles and behaviors to minimize their cancer risk. While screening and early detection are also important aspects of cancer control, prevention through lifestyle modifications is the fundamental strategy in reducing the burden of cancer in the population.

Correct Answer: A

Rationale: Second-hand smoke exposure increases the risk of middle ear effusions, leading to recurrent ear infections and potential hearing loss.

Correct Answer: C

Rationale: Most infants can pull themselves to a standing position at age 9 months. Infants who are not able to pull themselves to standing by age 11 to 12 months should be further evaluated for developmental dysplasia of the hip.

Correct Answer: C

Rationale: The steeple sign is a characteristic radiological feature of acute laryngotracheobronchitis (croup). It results from subglottic airway narrowing, visible on anteroposterior neck X-rays as a tapering of the trachea.