PMC6498815_01
Preoperative T2-weighted magnetic resonance image. Magnetic resonance imaging of the synovial cyst in the left temporomandibular joint.. A = the synovial cyst is visualized in the coronal plane.. B = the synovial cyst is visualized in the axial plane.. The cyst is marked by a white arrow. The cyst lumen is fluid filled, making the cyst lumen bright on the T2-weighted MRI.
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fig1
Magnetic resonance imaging (MRI) showed a cyst-like structure, 9 mm in diameter, in front of the left auditory meatus and distal to the collum mandibulae (Figure 1).
Perioperative photo of synovial cyst excision.. White arrow marks synovial cyst.
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fig2
The cyst was removed and sent for histopathological examination (Figures 2 - 3).
Synovial cyst following excision.. Note clear gelatinous material leaking from the cyst, marked by the white arrow.
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fig3
The cyst was removed and sent for histopathological examination (Figures 2 - 3).
Histology shows a folded cystic structure lined by flattened synovial cells (original magnification x100).. In the cyst wall myxoid degeneration is observed (hematoxylin and eosin staining).
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fig4
These finding were consistent with the histological and clinical diagnosis of a synovial cyst (Figure 4).