Severity reflects the AI reading's own wording — it is not a diagnosis, and not your radiologist's opinion.
New or worsening symptoms? Contact your doctor promptly, whatever this summary says.
The anterior cruciate ligament is discontinuous and poorly defined in the intercondylar notch, with irregular low-signal fiber remnants separated by bright fluid; this is the most significant finding because the normal continuous ligament appearance is substantially lost.
The weight-bearing cartilage over the right lateral femoral condyle and opposing lateral tibial plateau is markedly thinned and irregular, with focal near-complete cartilage loss and subjacent increased fluid-sensitive marrow signal; the opposing articular surfaces are consequently brought closer together and the lateral joint space is focally narrowed. This is the most significant finding of the series because it represents the greatest loss of normal articular surface compared with the associated meniscal abnormality.
This is the most significant finding of the series because of its size and mass effect: a multiloculated fluid-signal collection lies posterior to the medial femoral condyle and proximal tibia, extending between the posterior capsule and adjacent musculotendinous structures; it separates and mildly indents those structures.
The femoral condyle marrow is patchily heterogeneous with a slightly darker subchondral zone along the weight-bearing surface, differing from the uniformly bright fatty marrow of the adjacent tibial metaphysis; the overlying cortical margin remains a continuous thin dark line and is not stepped. This is the most significant finding of the series because a marrow signal change outranks the surrounding well-defined normal structures, though no cortical break or displaced fragment accompanies it.
A focal subchondral low-signal defect with surrounding marrow signal alteration and slight irregularity of the overlying articular surface is present posteriorly; no displaced fragment is visible. This is the most significant finding of this series because it alters the subchondral and articular contour more than the other visible structures.
The medial meniscal body and posterior horn are low-signal and triangular but show mild extrusion beyond the peripheral tibial margin compared with the opposite side, and the adjacent medial femorotibial joint space is narrowed relative to the lateral compartment.
A smaller fluid-bright recess is present along the posterior aspect of the right femorotibial joint, but it is much less extensive than the collection behind the left knee.
On these slices, no abnormality was seen in: the femoral condyle and its subchondral cortex, the tibial plateau and its subchondral cortex, the patella, the quadriceps and patellar tendons, the anterior and posterior meniscal horns as visualized on the central sections, and the cruciate ligament fibers where crossed by these sagittal planes. Marrow signal of femur and tibia is homogeneous on the sections shown.
Bright fluid signal distends the joint, most conspicuous in the intercondylar notch and along the posterior joint line on the distal slices, outlining the cruciate ligaments and separating the femoral condyles from the adjacent soft tissue. This is the most significant finding of this series because it reflects a fluid collection displacing normal fat planes, whereas the other observations are only regional signal or contour variations.
On the proximal slices a small oval structure with intermediate-to-dark signal lies anterolateral to the large dark marrow-containing bone, distinct in outline from the surrounding muscle and the main bone.
The paired rounded vascular structures behind the joint are surrounded by fluid signal and lie immediately anterior to the posterior collection, which abuts them on the more distal slices.
Diffuse feathery high signal is present throughout the subcutaneous and peri-articular soft tissues on the anterior slices, brighter than the underlying muscle, tracking around both sides of the joint.
The lateral meniscal body is irregular and extends beyond the lateral tibial margin, with fluid-signal clefts traversing the meniscal substance and reaching the articular surface; adjacent fluid separates and surrounds the extruded meniscal margin at the lateral joint line.
A well-defined rounded oval structure with a low-signal rim sits within the subcutaneous/superficial soft tissue, distinct from the surrounding uniformly bright fat; it does not deform the adjacent muscle or bone. This is the most conspicuous focal deviation on these slices, though it is smoothly marginated and rounded rather than an interruption of any cortex.
A round low-signal structure lies in the posterior soft tissue behind the femoral condyle, with a smooth margin and no mass effect on adjacent structures, consistent in course with a vascular channel.
The infrapatellar fat pad anterior to the tibial plateau appears uniformly bright with fine linear dark strands traversing it; it abuts but does not displace the anterior tibial cortex.
A well-defined vertically elongated collection of fluid-bright signal sits along the joint margin superficial to the femoral condyle and tibia, brighter than the surrounding muscle and displacing the adjacent soft-tissue planes outward. This is the most significant finding of this series because a discrete fluid collection outranks the diffuse soft-tissue signal elsewhere.
There is fluid-bright distention of the posterior and medial joint recesses around the left femorotibial joint, with surrounding soft-tissue edema-like high signal in the adjacent posterior tissues.
AI-assisted scan reading — not a clinical report
Issued: 2026-09-05
This document was generated by artificial intelligence from the scan images. It is an explanatory aid, NOT a diagnosis and NOT a substitute for a radiologist report. Always discuss it with your doctor.
Whole-exam read: 4 of 8 series, 125 representative slices in total.
This knee MRI shows extra fluid inside and around the knee joint, which the readings of the images agreed on. Several other observations were noted by only one of the readers and not the others, or the readers looked and reached opposite conclusions, so those points are not settled and need a human radiologist to review the actual images. Because some of the disagreements involve cartilage, ligaments, and the meniscus, it would be worth reviewing this with your doctor.
The finding the readings agreed on is extra fluid inside and around the knee. Extra joint fluid is a general sign that the knee may be irritated, inflamed, or injured, but on its own it does not tell you the cause. Many of the other observations — including possible changes to the ligaments, the meniscus, the cartilage, and the bone under the cartilage, and even fluid around the opposite knee — were seen by only one reading and not the others, or the readings disagreed, so they cannot be treated as confirmed. These conflicts are exactly the points a radiologist and your doctor would want to review against the actual images, because they could matter and because the readings do not agree. This report explains what the imaging model reported; it does not diagnose a cause and does not replace review by a radiologist or physician.
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