A 65-year-old male complains of a headache that feels “like…

A 65-year-old male complains of a headache that feels “like a knife is cutting into his head.” He also reports feeling right-sided scalp and facial pain and “seeing double” at times. He has a history of hypertension and hyperlipidemia. His medications include beta blocker, statin drug, and an ACE inhibitor. On physical examination, you note palpable tenderness over the right side of the forehead. There are no neurological deficits. Vision is 20/20 with lenses. No weakness of extremities. CN II to XII are intact. The history corresponds to which of the following disorders?

A 26-year-old sports store manager comes to your clinic, com…

A 26-year-old sports store manager comes to your clinic, complaining of severe right-sided abdominal pain for 12 hours. He began having a stomachache yesterday, with a decreased appetite, but today the pain seems to be just on the lower right side. He has had some nausea and vomiting but no constipation or diarrhea. His last bowel movement was last night and was normal. He has had no fever or chills. He denies any recent illnesses or injuries. His past medical history is unremarkable. He is engaged. He denies any tobacco or drug use and drinks four to six beers per week. His mother has breast cancer and his father has coronary artery disease. On examination he appears ill and is lying on his right side. His temperature is 100.4 and his heart rate is 110. His bowel sounds are decreased and he has rebound and involuntary guarding, one third of the way between the anterior superior iliac spine and the umbilicus in the right lower quadrant. His rectal, inguinal, prostate, penile, and testicular examinations are normal. What is the most likely cause of his pain?