Extramedullary plasmacytoma as an exceptional location in frontal sinus.

We present the case of a 64-year-old woman who came to Emergency Services with a left frontal mass that was painful when palpated. The mass had a history of 3 days, lacking affectation of ocular motility and nasal symptoms. With the diagnostic suspicion of frontal mucocele, she was admitted to begin antibiotic treatment. In the CT performed, the image showed mainly left frontal occupation with notable bone erosion, along with disruption of the diploic inner table and extension towards ethmoid cells and left orbit (Fig. 1). Faced with the tumour size and aggressiveness, we chose to perform surgery using an external frontal approach; we found a friable bluish-grey tumour mass, affecting both the inner and external tables of the frontal bone, and which was fistulised towards the left orbit (Fig. 2). The apparently unaffected dura mater was seen through the bone