23. A 25-year-old administrative assistant presents to the clinic with a small, painless lump on the back of their right wrist. The lump appeared to be fluid-filled and would occasionally increase in size. The patient denies pain but notices some discomfort, and the lump becomes more prominent when they move their wrist. What is the likely diagnosis based on the clinical presentation?
Answer: B
Ganglion cyst is the likely diagnosis based on the clinical presentation.
The clinical presentation of a small, painless lump on the back of the wrist that is fluid-filled and increases in size with movement strongly suggests a ganglion cyst. These cysts are commonly associated with joints and tendons, particularly in the wrist, and can often be asymptomatic aside from discomfort during wrist motion.
A) Rheumatoid arthritis
Rheumatoid arthritis is an inflammatory condition that typically presents with joint pain, swelling, and stiffness, often affecting multiple joints symmetrically. The patient’s description of a painless lump that is fluid-filled does not align with the classic symptoms of rheumatoid arthritis, making this option incorrect.
B) Ganglion cyst
Ganglion cyst is characterized by a fluid-filled sac that forms near a joint, most commonly seen on the wrist. The description of the lump being painless, fluid-filled, and increasing in size with wrist movement is consistent with this diagnosis, supporting it as the correct answer.
C) Carpal tunnel syndrome
Carpal tunnel syndrome involves compression of the median nerve in the wrist, leading to symptoms such as pain, tingling, and numbness in the hand. The patient’s presentation of a lump rather than neurological symptoms and the lack of pain make this diagnosis unlikely.
D) Trigger finger
Trigger finger is a condition where a finger becomes stuck in a bent position due to inflammation of the tendons. It typically presents with pain and a locking sensation in the affected finger, which is not consistent with the description of a painless lump on the wrist. Therefore, this option is incorrect.
Conclusion
The characteristics of the lump, including its painless nature, fluid-filled composition, and behavior during wrist movement, align perfectly with a ganglion cyst diagnosis. Other options, such as rheumatoid arthritis, carpal tunnel syndrome, and trigger finger, present with symptoms that do not match the case, confirming that ganglion cyst is the most likely condition in this scenario.