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| IMAGING FOR RESIDENTS – QUIZ |
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| Year : 2020 | Volume
: 28
| Issue : 2 | Page : 130-131 |
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A runner with right lateral knee pain
Shaw-Gang Shyu1, Mathieu Boudier-Revéret2
1 Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital, Taipei, Taiwan
2 Department of Physical Medicine and Rehabilitation, University of Montreal Health Center, Montreal, Canada
| Date of Submission | 30-Mar-2019 |
| Date of Acceptance | 16-Apr-2019 |
| Date of Web Publication | 07-Aug-2019 |
Correspondence Address:
Dr. Mathieu Boudier-Revéret
Department of Physical Medicine and Rehabilitation, University of Montreal Health Center, Montreal
Canada
 Source of Support: None, Conflict of Interest: None
DOI: 10.4103/JMU.JMU_33_19
How to cite this article:
Shyu SG, Boudier-Revéret M. A runner with right lateral knee pain. J Med Ultrasound 2020;28:130-1 |
| Section 1 – Quiz | |  |
This is the case of a 45-year-old male without known systemic disease. He participated in a few marathons and triathlons in the past 2 years. However, he gradually felt dull and discomfort just over his right lateral knee in the last 4 months, especially the days after his running or bicycling. He reported no known significant trauma or contusion over his right knee. He described his pain as being poorly localized, deep, and occasionally aching. On examination, muscle strength, sensation, and deep tendon reflexes of the bilateral lower limbs were normal and symmetric. Knee range of motion was full, without significant evidence of intra-articular effusion. Meniscal tests were negative, and on palpation, the most tender point seemed to be over the proximal tibiofibular joint (PTFJ).
He was then referred to the physiatrist clinic for a musculoskeletal ultrasonography to better assess the area of tenderness at the anterolateral knee.
The significant findings were a 6.7 mm × 5.7 mm × 9.0 mm cystic multilobulated lesion with anechoic content emerging both anteriorly and posteriorly from the right PTFJ [Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5]. Power Doppler was negative [Figure 2], and the cyst was noncompressible. No cortical irregularity was noted at the PTFJ. The remainder of the right knee ultrasound examination was within normal limits, including evaluation of the iliotibial band and biceps femoris. | Figure 1: Right biceps femoris in the long axis, with a multilobulated cystic lesion deep to the biceps femoris, measuring 6.7 mm × 5.7 mm with anechoic content
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 | Figure 2: Right biceps femoris in the long axis, with power Doppler activated over a cystic lesion deep into the biceps femoris
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 | Figure 3: Transverse view of the cystic lesion, measuring 9.0 mm × 5.9 mm in this axis
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 | Figure 4: Lobulated cystic lesion seen emanating from the proximal tibiofibular joint in the transverse axis
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 | Figure 5: Longitudinal view of the multilobulated cystic lesion overlying the proximal anterior tibia
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Magnetic resonance imaging was performed within a month to confirm the diagnosis [Figure 6], [Figure 7], [Figure 8]. | Figure 6: Transverse cut of the right proximal leg on magnetic resonance imaging
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 | Figure 8: Sagittal cut of the right lateral knee on magnetic resonance imaging
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With the information provided, the reader should be able to make the diagnosis and establish potential treatment options.
| What Is the Diagnosis? | | |
Declaration of patient consent
The authors certify that they have obtained appropriate patient consent form. In the form, the patient has given his consent for his figures and other clinical information to be reported in the journal. The patient understands that his name and initial will not be published, and due efforts will be made to conceal his identity, but anonymity cannot be guaranteed.
Financial support and sponsorship
Nil.
Conflicts of interest
There are no conflicts of interest.
[Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6], [Figure 7], [Figure 8]
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