A 15-year-old high school sophomore presents to the emergency room with his mother for evaluation of an area of blood in the left eye. He denies trauma or injury but has been coughing forcefully with a recent cold. He denies visual disturbances, eye pain, or discharge from the eye. On physical examination, the pupils are equal, round, and reactive to light, with a visual acuity of 20/20 in each eye and 20/20 bilaterally. There is a homogeneous, sharply demarcated area at the lateral aspect of the base of the left eye. The cornea is clear. Based on this description, what is the most likely diagnosis?

Correct Answer: D

Rationale: A subconjunctival hemorrhage is a common and benign condition characterized by blood in the space between the conjunctiva and sclera of the eye. The condition often presents as a painless, sharply demarcated area of redness on the white part of the eye, typically without associated discharge or visual disturbances. In this case, the absence of eye pain, discharge, visual disturbances, and clear cornea make subconjunctival hemorrhage the most likely diagnosis. The history of forceful coughing with a recent cold is also consistent with the increased intraocular pressure leading to a rupture of a small blood vessel, resulting in the hemorrhage. Treatment is not usually required as the condition is self-limiting and resolves on its own over time.

Correct Answer: C

Rationale: The symptoms described, including decreased air movement, high-pitched whistling (wheezing) on expiration in all lobes, and resonant lungs on percussion, are characteristic findings of asthma. Asthma is a chronic respiratory condition characterized by airway inflammation, bronchoconstriction, and increased mucus production, leading to symptoms like wheezing, shortness of breath, chest tightness, and cough. The presence of wheezing, particularly on expiration, is a classic sign of asthma. In contrast, spontaneous pneumothorax would typically present with sudden chest pain and shortness of breath, accompanied by hyperresonant percussion notes due to trapped air in the pleural space. COPD, a chronic lung condition characterized by progressive airflow limitation, would often present with symptoms such as chronic cough, sputum production, and dyspnea on exertion. Pneumonia is an infection of the lung tissue,

Correct Answer: B

Rationale: Leaning forward in the upright position increases venous return and systemic vascular resistance, which can help accentuate the intensity of aortic regurgitation murmur. This position helps to bring the heart closer to the chest wall, making the murmur easier to auscultate and potentially increasing its intensity.

Correct Answer: B

Rationale: The description of dark tan patches with a reddish cast that have sharp borders and fine scales, especially more prominent on the upper back, chest, neck, and upper arms, is classic for tinea versicolor. Tinea versicolor is a superficial fungal infection caused by Malassezia species, which commonly affects individuals who sweat more, such as those working outdoors like the construction worker in this case. The rash is often pruritic (itchy) and can vary in color from tan to pink or red. The fine scales on the patches are a result of the accumulation of the yeast in the affected areas.

Correct Answer: D

Rationale: By telling the patient what to expect, giving her the option to stop or take a break, and checking in with her multiple times during the examination, you are accomplishing all of the above.

Correct Answer: B

Rationale: The patient described is most likely suffering from an external hemorrhoid. External hemorrhoids are swollen veins located near the opening of the anus, often resulting from increased pressure in the rectal area. The presence of a swollen bluish ovoid mass containing a blood clot is characteristic of an external hemorrhoid. The pain experienced during digital rectal examination further supports this diagnosis, as external hemorrhoids are typically painful when touched. In this case, there are no palpable masses within the anus or rectum, ruling out anorectal cancer or internal hemorrhoids. Anal fissures are small tears in the lining of the anus, which would present differently from the described swollen mass with a blood clot.

Correct Answer: C

Rationale: By connecting the patient's presenting symptoms (wheezing when exposed to cats) and family history of asthma, you have identified asthma as the most likely diagnosis for the 5-year-old girl. This initial conclusion, based on the available information, is known as a working diagnosis. Further evaluation and testing may be required to confirm the diagnosis, but at this stage, you have established a preliminary understanding of the likely condition affecting the patient.

Correct Answer: D

Rationale: Prostate cancer is more prevalent in certain ethnic groups, with African-American men having the highest risk of developing prostate cancer compared to men of other ethnicities. Additionally, men of Caribbean and West African descent also have an increased risk compared to men of Asian descent. This indicates that ethnicity plays a role in the risk of developing prostate cancer.

Correct Answer: B

Rationale: Even after a unilateral mastectomy, women should continue to self-examine and have regular clinical examinations for any signs of recurrence or new masses. It is important to closely monitor the surgical scar area for any changes or abnormalities, as breast cancer can still occur in the remaining breast tissue. Regular breast examinations remain important in the early detection of any potential issues, even after mastectomy.