Pulmonary fat embolism of neoplastic origin

We report the case of a 67-year-old female patient who had hypertension and diabetes and had recently been diagnosed with a right renal mass. Abdominal CT and magnetic resonance imaging (MRI) showed that the renal mass, which measured approximately 7.5 cm along its longest axis, was predominantly exophytic, was located in the upper half of the right kidney, and had areas suggestive of intratumoral fat; in addition, the signal of the lesion extended to the ipsilateral renal vein and the inferior vena cava (Figure 1A). Histopathological examination of a CT-guided percutaneous biopsy sample revealed the presence of clear cells and oxyphilic cells that were probably malignant, with a moderately elevated proliferative index; a diagnosis of malignant primary renal neoplasm was therefore made.