David, a 48 year-old construction worker presents with a 4-week history of right-sided groin pain. The pain is described as sharp, burning, and radiates to the upper thigh and scrotum. He also reports intermittent numbness in the same areas. The pain worsens with walking and tight clothing but improves slightly with rest. He denies any swelling, fever, or redness in the groin. Past Medical History: Hypertension, controlled with medication. No history of prior groin pain or surgeries. Physical Examination: Vital Signs: Normal. Inspection: No redness, swelling, or hematoma in the groin area. Palpation: Tenderness in the right inguinal region without masses Sensory Testing: Decreased sensation to light touch in the right upper thigh and scrotum. Motor Testing: Cremasteric reflex absent on the right side. Which of the following is the most common cause of this nerve injury?

Emma, a 7-year-old girl, is brought to the clinic by her parents due to a 3-day history of watery diarrhea, abdominal pain, and low-grade fever. Her parents note that the pain seems to be worse in the lower right side of her abdomen, and she has been lethargic. They mention that Emma drank unpasteurized milk at a family farm outing a week ago. On physical examination, Emma has mild dehydration, and her abdomen is tender in the right lower quadrant, raising concerns about appendicitis. Stool analysis is performed which confirms the diagnosis. Which of the following is the most common causative agent of yersiniosis?

A 10-month-old male is brought to the emergency department with a 12-hour history of severe, intermittent crying episodes. The infant pulls his legs to his chest during the episodes and appears lethargic between them. His mother reports one episode of vomiting, initially non-bilious but now greenish, and a single stool containing blood and mucus. On physical examination, his abdomen is mildly distended, and a sausage-shaped mass is palpated in the right upper quadrant. What is the most likely diagnosis?