Correct Answer: A

Rationale: The clinical presentation of this 17-year-old high school senior is concerning for a spontaneous pneumothorax. A spontaneous pneumothorax occurs when air enters the pleural space, resulting in lung collapse. Risk factors for spontaneous pneumothorax include tall, thin body habitus and smoking. In this case, the patient's sudden onset of right-sided chest pain and severe shortness of breath, along with absent breath sounds on the right side of the chest and hyperresonance on percussion, are consistent with a pneumothorax. The absence of lung sounds and fremitus on palpation over the right upper lobe further support this diagnosis. Chronic obstructive pulmonary disease (COPD) and asthma typically present with more chronic symptoms, while pneumonia is usually associated with fever, productive cough, and other signs of infection. Given the history and physical examination findings, spontaneous pneumothorax is the most

Correct Answer: A

Rationale: The presence of a firm and immobile mass felt against the bowel wall during a rectal examination is concerning for a potential malignancy, such as colon cancer. Other conditions such as hemorrhoids or anal fissures are typically not associated with a mass that is firm and immobile. The "Valve of Houston" is a term that does not pertain to this scenario and is not a recognized medical entity. Therefore, the most likely diagnosis based on the given information is colon cancer, and further evaluation such as a colonoscopy would be warranted for definitive diagnosis and management.

Correct Answer: D

Rationale: The most appropriate response based on the information provided would be to give the patient information concerning the reduction of fat and cholesterol in her diet because she is obese. The patient's weight falls in the obese category, and addressing diet is an important step in managing obesity. Providing guidance on reducing fat and cholesterol intake can help the patient make healthier food choices and work towards achieving a healthier weight. Additionally, diet plays a significant role in overall health, so addressing nutrition is crucial when managing obesity. It is important to approach the topic sensitively and provide support and resources to help the patient make positive changes for their health.

Correct Answer: C

Rationale: Peyronie's disease is a condition characterized by the formation of fibrous scar tissue in the penis, leading to the development of plaques or indurations along the shaft of the penis, typically on the ventral surface. These plaques can cause penile curvature, pain, and erectile dysfunction. Urethral stricture, testicular carcinoma, and epidermoid cysts are not typically associated with indurations along the ventral surface of the penis.

Correct Answer: C

Rationale: The patient's history of frequent loose stools with cramping, occurring since high school and worsening during periods of nervousness, along with occasional constipation, is characteristic of irritable bowel syndrome (IBS). IBS is a functional gastrointestinal disorder that presents with symptoms such as abdominal pain or discomfort, bloating, and altered bowel habits (diarrhea, constipation, or both) without any evidence of organic disease. The absence of systemic symptoms like fever, weight loss, or blood in the stool, as well as normal physical examination findings, also support the diagnosis of IBS in this case. This condition is often triggered or exacerbated by stress or anxiety. Monitoring stress levels, dietary modifications, and possibly prescription medications may help manage IBS symptoms in this patient.