Presentation
Long standing lump behind the back of the knee. Baker's cyst?
Patient Data
Age: 45 years
Gender: Female
From the case:
Speech bubble sign
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4.3cm well defined hypoechoic cystic 'bubble shaped' lesion with a tight narrow neck arising from the synovial space of the posterior aspect of the knee joint.
No internal Doppler flow.
Case Discussion
This is the classical appearance of a Baker's cyst with the shape that of a speech bubble.
The neck is at the deepest part of the cyst. The content may contain internal echoes.