A patient is unable to abduct the arm past 15 degrees, but the deltoid strength is intact. Which nerve is injured?

A patient describes a progression of weakness over a 6-day period that began with moderate weakness in a glove and stocking distribution and has progressed to difficulty with all movements. The MOST likely diagnosis is: 

Resting tremor, rigidity, and bradykinesia are hallmark signs of: 

The biopsy from esophageal ulceration is shown as following.  What is the most likely cause of the ulceration?

A 21-year-old man has had increasingly voluminous bulky frothy stools for the past years without melena.  Which of the following lab findings is most likely to  be present on examination of his stool?

Which of the following choices is NOT considered to be a significant risk factor for development of gastric cancer?

Patient exhibits normal light touch and pin-prick sensation on the L side and normal R light touch down to T6. R pin-prick sensation is normal to T7. Sensation absent everywhere else. Elbow Extensors 5/5 Finger flexors 5/5 Finger abductors 5/5 VAC/DAP = NO   What is the neurological level of injury?

A 4-year-old boy developed a 1.5-cm pedunculated polyp with smooth surface.  Polypectomy specimen shows cystic dilated glands filled with mucin and inflammatory decries.  What is the most likely diagnosis?

Which of the following conditions is MOST likely to be associated with the presence of spastic bowel dysfunction in a patient?

A 66-year-old man living in Tehran, Iran, has been found an ulcerated obstructing mass 20 cm from lips.  Biopsy shows infiltrating nests of keratinized cells with hyperchromatic nuclei.  Which of the following is the most likely risk factor for his disease?