0 / 4 complete

USMLE® Step 1 questions

0 / 3 complete

High Yield Notes

3 pages



of complete


USMLE® Step 1 style questions USMLE

of complete

A 38-year-old man comes to his primary care physician for evaluation of intermittent muscle weakness that began around three months ago. He reports having episodes of “seeing-double” and having difficulty chewing that occur in the evening and resolve the next morning. Past medical history is notable for asthma, for which he intermittently uses an albuterol inhaler. His temperature is 37.6°C (99.7°F), pulse is 65/min and blood pressure is 122/71 mmHg. During the physical examination, the patient is asked to look upwards toward the ceiling for 60 seconds. This maneuver elicits bilateral diplopia. The remainder of the examination is noncontributory. Workup is sent to confirm the diagnosis, and the patient is started on the first-line medication for his condition. Which of the following is a likely side-effect from overdose of this medication?

Memory Anchors and Partner Content

External References

First Aid








Myasthenia gravis p. 484

thymoma association p. 96


myasthenia gravis and p. 221, 483

paraneoplastic syndromes p. 221


Thymoma is a rare type of tumor that arises from the epithelial cells of the thymus gland that is located in the chest behind the breastbone. Thymomas may not cause any symptoms in the early stages of the disease, but as they grow and compress the nearby structures, causing symptoms like superior vena cava syndrome, dysphagia, cough, or chest pain.

Thymomas are frequently associated with the neuromuscular disorder myasthenia gravis or autoimmune conditions like pure red cell aplasia and Good syndrome. Diagnosis of thymoma involves imaging studies such as CT or MRI scans. A biopsy may also be performed to confirm the diagnosis. Treatment options may include surgery to remove the tumor, radiation therapy, chemotherapy, or a combination of these approaches.


Copyright © 2023 Elsevier, its licensors, and contributors. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

Cookies are used by this site.

USMLE® is a joint program of the Federation of State Medical Boards (FSMB) and the National Board of Medical Examiners (NBME). COMLEX-USA® is a registered trademark of The National Board of Osteopathic Medical Examiners, Inc. NCLEX-RN® is a registered trademark of the National Council of State Boards of Nursing, Inc. Test names and other trademarks are the property of the respective trademark holders. None of the trademark holders are endorsed by nor affiliated with Osmosis or this website.