case_images: PMC11828661_01
case_images: Non-contrast MRI sagittal (SAG) T2 fat suppressed (FS) image of the patient's enhancing fluid collection demonstrating distal positioning and extramuscular extension.
case_images: cureus-0017-00000077502-i01.jpg
case_images: PMC11828661_01_cureus-0017-00000077502-i01.jpg
case_images: FIG1
case_images: A previously performed non-contrast MRI of the right tib/fib was reviewed, which redemonstrated a multilobulated rim-enhancing fluid collection between the gastrocnemius and semimembranosus as well as a complex medial meniscus tear (Figure 1).
case_images: Sonographic image demonstrating sagittal, long axis view of anechoic, compressible fluid collection located 4-8 cm distal to the level of the popliteal fossa.
case_images: cureus-0017-00000077502-i02.jpg
case_images: PMC11828661_01_cureus-0017-00000077502-i02.jpg
case_images: FIG2
case_images: Examination by the attending physiatrist was augmented by bedside point-of-care US, which revealed a hypoechoic, compressible fluid collection in the subcutaneous position which did not enhance with power Doppler evaluation (Figure 2).
case_images: Sonographic image demonstrating axial, short axis view of the medial popliteal fossa region revealing an anechoic, compressible fluid collection between the medial head of the gastrocnemius muscle and semimembranosus, which was still visualized when adjusting for anisotrophy.
case_images: cureus-0017-00000077502-i03.jpg
case_images: PMC11828661_01_cureus-0017-00000077502-i03.jpg
case_images: FIG3
case_images: The fluid collection was scanned proximally where it was found to be continuous with the posterior knee joint in the expected position of a Baker's cyst (Figure 3). 
case_images: Sonographic image demonstrating sagittal / long axis view of the Baker's cyst status post doxycycline sclerosis demonstrating hyperechoic irregular synovial tissue within the cyst walls which was minimally compressible.
case_images: cureus-0017-00000077502-i04.jpg
case_images: PMC11828661_01_cureus-0017-00000077502-i04.jpg
case_images: FIG4
case_images: The cyst was smaller in size, but he was interested in attempting a repeat treatment to further reduce the cosmetic appearance of the cyst (Figure 4).