Endoscopic Trans-Sinus Approach for Biopsy of the Inferior Rectus Muscle

We describe a case of a 68 year-old female presenting with a posterior left inferior rectus muscle mass. The patient underwent biopsy of the mass via an endoscopic trans-sinus approach, only rarely discussed previously in the literature. The Pathology results obtained from the muscle showed atrophic and fibrotic muscle with mild chronic inflammatory infiltrate, compatible with the diagnosis of inflammatory process. The patient was started with oral prednisone for idiopathic orbital inflammation.