A 45-year-old man without significant past medical history presents with severe back pain after lifting boxes at work 2 days ago. Other than his back pain, his review of symptoms is negative. The pain radiates from his lower back down his posterior thigh to his great toe when you perform both a straight leg raise test and the contralateral leg raise. His strength, sensation, and reflexes are preserved. Which of the following imaging studies should be done immediately?

A positive Tinnel’s test can be used to assess for carpal tunnel syndrome. What other test can be used to assess for this?

A 65 yo male is diagnosed with an initial episode of gout. It is likely that he:

A 65-year-old man with a history of chronic hypertension, diabetes mellitus, and degenerative joint disease presents with acute onset of severe pain of the metatarsophalangeal (MTP) joint and swelling of the left first toe. Physical examination shows exquisite tenderness of the joint, with swelling, warmth, and erythema. The patient has no history of trauma or other significant medical problems. Synovial fluid analysis and aspiration is most likely to show which of the following?

A 21 year old college student studying for final examinations complains of recurrent right temple pain, preceded by flashing lights, and followed by nausea lasting 3-5 hours. Which is the most likely diagnosis? 

In this sagittal section showing the upper respiratory tract, what structure does number 4 indicate?

A 22-year-old woman complains of headache of 2 hours duration that is described as unilateral and throbbing with nausea, photophobia, and phonophobia. Which of the following is the most likely diagnosis?

Approximately how many copies (amplicons) of the template DNA are made in 5 PCR cycles?

  This figure shows a frontal section of the kidney. Which number(s) indicate a renal papilla?

Most amino acids are essential amino acids.