An 8-year-old girl comes with her mother for evaluation of hair loss. She denies pulling or twisting her hair, and her mother has not noted this behavior at all. She does not put her hair in braids. On physical examination, you note a clearly demarcated, round patch of hair loss without visible scaling or inflammation. There are no hair shafts visible. Based on this description, what is your most likely diagnosis?

Correct Answer: A

Rationale: The description provided, which includes a clearly demarcated, round patch of hair loss without visible scaling or inflammation and absence of hair shafts, is characteristic of alopecia areata. Alopecia areata is an autoimmune condition that causes hair loss in round or oval patches on the scalp or other parts of the body. It is not associated with pulling or twisting of hair (trichotillomania), fungal infection (tinea capitis), or hair loss due to constant pulling force (traction alopecia). In alopecia areata, the affected area usually appears smooth and without visible signs of irritation. Treatment options for alopecia areata may include corticosteroid injections, topical immunotherapy, or minoxidil.

Correct Answer: B

Rationale: Relief of the pain with bending at the waist is a key hallmark of spinal stenosis. This position helps relieve the pressure on the nerves in the spinal canal, which is often the root cause of the leg symptoms experienced by the patient. The symptoms described by Mr. Edwards, such as cramps in the calves after walking a certain distance, followed by relief with rest and recurrence upon walking again, are highly suggestive of spinal stenosis. This condition involves narrowing of the spinal canal, leading to compression of the nerves and resulting in symptoms like leg cramps, weakness, and difficulty walking, especially with prolonged activity. The relief of symptoms when bending forward (e.g., leaning on a shopping cart while walking) is a characteristic feature of neurogenic claudication associated with spinal stenosis.

Correct Answer: B

Rationale: A sudden, painful unilateral loss of vision is a medical emergency that may be caused by central retinal artery occlusion. This condition occurs when the main artery supplying blood to the retina becomes blocked, leading to a sudden and severe reduction in blood flow to the eye. The lack of blood flow can cause irreversible damage to the retina, resulting in a significant loss of vision. Patients with central retinal artery occlusion typically present with sudden, painless, and severe vision loss in one eye. Immediate medical attention is crucial to try to restore blood flow and minimize potential permanent vision loss in these cases. Vitreous hemorrhage, macular degeneration, and optic neuritis do not typically present with sudden, painful unilateral loss of vision as seen in central retinal artery occlusion.

Correct Answer: B

Rationale: The scenario described suggests that Ray experiences pain only when actively lifting his arm over his head, which indicates the issue is likely originating from structures outside of the joint itself. When the shoulder is moved passively (moved by an external force), there is full range of motion without pain, suggesting that the limitation and pain occur due to muscles, tendons, or ligaments surrounding the joint rather than within the joint itself. In this case, the joint disease is likely to be extra-articular, involving structures such as muscles or tendons rather than being articular in nature.

Correct Answer: B

Rationale: The clinical presentation described involves a patient with pericarditis. Pericarditis is inflammation of the pericardium, the sac surrounding the heart, which can lead to characteristic findings such as a scratching noise heard on auscultation, leaning forward relieving pain, and normal lung examination findings. The presence of pericarditis can also lead to a pericardial friction rub, which is often described as a scratching or grating sound heard best at the lower left sternal border.

Correct Answer: A

Rationale: The description provided, which includes a clearly demarcated, round patch of hair loss without visible scaling or inflammation and absence of hair shafts, is characteristic of alopecia areata. Alopecia areata is an autoimmune condition that causes hair loss in round or oval patches on the scalp or other parts of the body. It is not associated with pulling or twisting of hair (trichotillomania), fungal infection (tinea capitis), or hair loss due to constant pulling force (traction alopecia). In alopecia areata, the affected area usually appears smooth and without visible signs of irritation. Treatment options for alopecia areata may include corticosteroid injections, topical immunotherapy, or minoxidil.

Correct Answer: C

Rationale: This categorization is based on the blood pressure readings. Stage 1 hypertension is defined as having a systolic blood pressure between 130-139 mmHg or a diastolic blood pressure between 80-89 mmHg. The blood pressure falls within this range, indicating mild hypertension. It is important to monitor and manage blood pressure to prevent complications associated with hypertension.

Correct Answer: A

Rationale: The most appropriate amount for a weekly weight reduction goal is typically .5 to 1 pound per week. This rate of weight loss is considered safe and sustainable in the long term. Losing weight too quickly (options B, C, D) can be harmful to your health and may lead to muscle loss, nutritional deficiencies, and a slow metabolism. Rapid weight loss is also harder to maintain in the long run. Gradual weight loss of .5 to 1 pound per week allows for healthy changes to diet and exercise habits, making it more likely to be maintained over time. It is also more likely to result in lasting weight loss and overall improvements in health and well-being.

Correct Answer: B

Rationale: The patient's history of swimming and presenting symptoms of ear pain, drainage, and manipulation tenderness are suggestive of external otitis, commonly known as swimmer's ear. External otitis is an infection of the outer ear canal, which can be caused by prolonged moisture exposure, trauma, or bacterial/fungal infections. The narrowed and erythematous canal with white debris is characteristic of this condition. Otitis media (Choice A) typically presents with deep ear pain, hearing loss, and sometimes fever, but does not involve the ear canal. Perforation of the tympanum (Choice C) would present with sudden relief of pain and possible drainage from the ear. Cholesteatoma (Choice D) is characterized by a painless cyst or mass in the middle ear, not presenting with these acute ear canal symptoms.