Correct Answer: D

Rationale: Given the description provided, the lesion appears to be a dermatofibroma. Dermatofibromas are common benign skin lesions that typically present as a firm, solitary nodule on the skin. They commonly occur on the lower extremities but can also be found on the trunk. The characteristics of a dermatofibroma include being firm to the touch, having regular borders, being evenly pigmented, and a diameter typically less than 1 cm to 2 cm. They are usually painless and do not change significantly over time.

Correct Answer: A

Rationale: A sudden, painless unilateral vision loss may be caused by a retinal detachment. Retinal detachment occurs when the retina, which is the light-sensitive tissue lining the back of the eye, pulls away from its normal position. This can lead to visual disturbances, including sudden loss of vision in one eye. Retinal detachment can be a medical emergency and requires prompt evaluation and treatment to prevent permanent vision loss. Other conditions mentioned in the choices, such as corneal ulcer, acute glaucoma, and uveitis, may also cause vision problems but are less likely to present with a sudden and painless unilateral vision loss as a primary symptom.

Correct Answer: B

Rationale: Mrs. Fletcher's symptoms of unilateral pain during chewing, which is chronic, without facial tenderness or tenderness of the scalp are more suggestive of temporomandibular joint (TMJ) syndrome rather than other conditions listed. TMJ syndrome is characterized by pain and dysfunction of the jaw muscles and the joints that connect the jaw to the skull. The pain is often worsened by chewing or opening the mouth widely. In this case, the absence of facial tenderness or signs of temporal arteritis makes these conditions less likely. Trigeminal neuralgia typically presents with sudden, severe facial pain in the distribution of the trigeminal nerve. Tumor of the mandible would likely present with other symptoms such as swelling, bone destruction, or difficulty with mouth opening and chewing. Temporal arteritis usually presents with symptoms such as headache, scalp tenderness, and visual disturbances. Given Mrs. Fletcher's presentation,

Correct Answer: D

Rationale: The constellation of symptoms described in the scenario, including chronic constipation, fatigue, weight gain, irregular periods, cold intolerance, and delayed deep tendon reflexes, suggests hypothyroidism as the likely cause. Hypothyroidism is a condition where the thyroid gland does not produce enough thyroid hormones, leading to a slowdown in bodily functions. Constipation is a common symptom of hypothyroidism due to the decreased motility of the bowel. The presence of cold intolerance, weight gain, and irregular periods further supports this diagnosis, as these are classic symptoms of hypothyroidism. The delayed deep tendon reflexes, especially in the Achilles tendons, are indicative of the myopathic changes that can occur in hypothyroidism. It is important to further investigate thyroid function through laboratory testing to confirm the diagnosis and initiate appropriate treatment. Other conditions such as large bowel obstruction, irritable bowel syndrome, and rectal cancer are less likely based

Correct Answer: B

Rationale: The patient's presentation with an enlarged chest diameter, decreased breath sounds throughout all lobes, and the presence of rhonchi over all lung fields is suggestive of a chronic condition that affects the entire respiratory system. These findings are classic for COPD, a progressive lung disease characterized by airflow limitation. The breath sounds are decreased due to airflow obstruction, and the presence of rhonchi indicates mucus production and airway inflammation commonly seen in COPD. In contrast, a spontaneous pneumothorax would typically present with sudden chest pain and shortness of breath, often in a younger patient with risk factors such as smoking. Asthma would present with wheezing, shortness of breath, and possibly a history of atopy or allergies. Pneumonia would typically present with fever, cough, and focal findings on chest examination, such as crackles or bronchial breath sounds over a consolidated area. In