Which statement best differentiates obsessive-compulsive disorder (OCD) from addiction?

A 59-year-old patient presents with bone pain, cranial enlargement, and limb bowing. Which diagnosis best explains the pathophysiologic findings of increased osteoclastic activity followed by excessive bone remodeling?

A patient with a history of multiple abdominal surgeries presents with sudden onset of severe abdominal pain, fever, and a rigid, tender abdomen. Imaging reveals dilated bowel loops and free intraperitoneal air. Which life-threatening complication is most likely?

Which statement best reflects the current understanding of autism spectrum disorder (ASD) etiology?

A patient with cirrhosis presents with confusion and jaundice. Laboratory studies reveal elevated liver enzymes and ammonia levels. What is the most likely diagnosis due to hepatic cell dysfunction?

A 60-year-old man with a history of chronic alcohol use presents with jaundice, ascites, and spider angiomata. Laboratory tests reveal thrombocytopenia, elevated bilirubin, and prolonged coagulation times. What do you suspect is contributing to these clinical manifestations?

Which clinical feature strongly suggests Lewy body dementia over all other forms of dementia?

A patient presents with hematemesis and is found to have dilated esophageal veins on endoscopy. What is the underlying cause?

A 55-year-old woman presents with a sudden explosive headache and visual disturbances. CT confirms subarachnoid hemorrhage. Which of the following best explains the pathophysiologic mechanism behind her symptoms?

A 16-year-old female presents with a painful bone mass in the femoral diaphysis, fever, and weight loss. Imaging shows a permeative lesion with soft tissue extension. What is the most likely diagnosis based on the pathophysiology?