CBC with differential: Normal.
Left Knee US: Case Photo #3, Case Photo #4 In the region of the swelling is a thin area of hypoechogenicity within the subcutaneous fat measuring 4 cm transversely [right to left] and approximately 6 cm longitudinally but only 0.3 cm in AP dimensions. This thin sliver of hypoechogenicity lies deep in the subcutaneous fat and is separate from the underlying quadriceps muscles and tendon. The quadriceps tendon itself is intact with no evidence of tear. There was no increased blood flow within the hypoechoic area. No knee joint effusion. The patellar retinacula are intact.
Left Knee MRI: Case Photo #1, Case Photo #2 Probable Morel Lavallee lesion in the left suprapatellar soft tissues. Cruciate and collateral ligaments and both menisci are intact.
Click here to continue. Challenge yourself by writing down a revised, working diagnosis before moving to the next slide.