A 72-year-old man gets up several times during a football ma…

A 72-year-old man gets up several times during a football match to go to the restroom to urinate, even though he has had only one beer. This is a problem that has plagued him for several years. When he visits his physician for a checkup, on physical examination he has an enlarged, nodular prostate palpated on digital rectal examination. Laboratory studies show his serum prostate specific antigen is in the normal range. Which of the following pathologic findings is most likely to be present on prostate biopsy in this man?

A 40-year-old previously healthy man has the sudden onset of…

A 40-year-old previously healthy man has the sudden onset of severe right flank pain that comes in waves all night long. When he is seen in the emergency room, after waiting for two hours, he is exhausted. On physical examination there are no abnormal findings. Urinalysis reveals no ketones, glucose, protein, nitrite, or urobilinogen, but blood is present. Urine microscopic examination shows many RBCs but few WBCs. The specific gravity is 1.015 and the pH is 5.5. Which of the following is the most likely diagnosis?