🦴 Parece tumor, mas não é! Aprenda com o caso!

🦴 Looks like a tumor, but it was bone edema due to mechanical overload In this case discussed with my fellows, the image was alarming: a subchondral bone edema in the knee, well lobulated, simulating a tumor lesion. ⚠️ But two findings greatly aided the diagnosis: ✅ Preserved fat interspersed When we still see fat/trabeculae interspersed in the altered area, we think more about edema infiltrating the bone marrow, and not a true tumor replacement. ✅ Facilitated diffusion This finding helps to rule out an aggressive hypercellular lesion, which would generally have greater restriction to diffusion. Associating this with the context of the knee, especially the meniscal tear and mechanical overload, the diagnosis became clear: 👉 subchondral bone edema due to mechanical overload, and not a tumor. 📌 Main message: Not all exuberant bone edema is a tumor. Before alarming the patient or suggesting unnecessary investigation, assess: 🔎 Is there preserved fat interspersed? 🔎 Is there an associated meniscal tear? 🔎 Is diffusion restricted or facilitated? 🔎 Is the pattern subchondral/overload? This reasoning avoids diagnostic error and makes the report much more reliable. 🎯 Hashtags: #Radiology #MusculoskeletalRadiology #KneeMRI #MagneticResonanceImaging #BoneEdema #BoneLesions #BoneTumor #DiagnosticImaging #Meniscus #Radiologist #MSK #MusculoskeletalImaging