Fat Embolism Syndrome Based on the Development of a Preliminary Proposed Framework Requiring Validation: A Narrative Literature Review

Summary

This narrative review synthesizes clinical evidence on fat embolism syndrome, integrating clinical manifestations, trauma history, and imaging features into a preliminary, conceptual, but unvalidated, proposal proposing novel diagnostic criteria. The framework aims to improve early detection and diagnostic specificity while highlighting current limitations and future research directions in pathophysiology and management.

Abstract

Fat embolism syndrome (FES) is a potentially life-threatening clinical condition characterized by multisystem dysfunction caused by fat particles entering the circulation, most commonly following trauma or orthopedic procedures. However, early diagnosis remains challenging due to nonspecific clinical manifestations and the limitations of existing diagnostic criteria. This narrative review aims to synthesize current evidence on the clinical features, pathophysiology, diagnostic approaches, imaging characteristics, and management strategies of FES, and to propose updated diagnostic criteria to improve clinical applicability. A narrative review of published studies and clinical reports was conducted to examine the relationship between clinical manifestations, trauma history, and imaging findings. The review highlights the variability in reported incidence, the multisystem involvement of respiratory, neurological, dermatological, and ocular systems, and the evolving role of imaging techniques, particularly magnetic resonance imaging, in detecting cerebral involvement. Based on these findings, we propose a preliminary framework for validation that integrates clinical manifestations, trauma history, and imaging evidence, with defined major criteria, supporting factors, and diagnostic protocols. Although the preliminary proposed criteria may enhance diagnostic specificity and facilitate earlier recognition, limitations remain, including the nonspecificity of certain clinical signs and reliance on advanced imaging resources. Future research should focus on elucidating molecular mechanisms, improving diagnostic tools, and developing targeted therapeutic strategies to optimize clinical outcomes in FES.

Introduction

Fat embolism syndrome (FES) is a complex clinical condition characterized by multisystem dysfunction resulting from the entry of fat particles into the circulation, most commonly after severe trauma, long bone fractures, or orthopedic procedures¹. Once in the bloodstream, these lipid droplets can obstruct microvasculature in critical organs such as the lungs and brain, leading to a wide spectrum of clinical manifestations ranging from mild hypoxemia to severe neurological impairment². Despite decades of clinical observation, FES remains underdiagnosed, particularly in its early stages, due to its insidious onset and the ....