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Insights into Imaging
Fig. 4 | Insights into Imaging

Fig. 4

From: MRI of diffuse-type tenosynovial giant cell tumour in the knee: a guide for diagnosis and treatment response assessment

Fig. 4

Differential diagnosis: gout in the knee. a Lateral radiograph demonstrates marked pre-patellar soft tissue swelling containing increased density and several ill-defined calcifications (arrow). b Sagittal T1 shows a prepatellar, low signal intensity oval shaped soft tissue mass and a subchondral cyst in the patella. c Axial T2 FS confirms the prepatellar, low signal intensity mass invading the quadriceps tendon (arrows) and shows joint effusion containing multiple small synovial proliferations in the suprapatellar recess (asterisk). Aspiration of joint fluid with crystals confirmed the diagnosis of gout. d Axial T2 FS demonstrates low signal intensity soft tissue lesions in keeping with gout tophi deep to the collateral ligaments, causing erosion of the medial and lateral femoral condyles (arrows)

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