Background: We report on the case of a patient who having initially presented with psychiatric symptoms and right-sided headaches, was found to have significant invasive bilateral frontal mucocoele
disease. Magnetic resonance imaging (MRI) and computed tomography (CT) demonstrated bilateral disease more so on the right, extending to the anterior cranial fossa.Case Report: The patient was under the joint care of the psychiatrists, the gastroenterologists and the otolaryngologists (ENT). Unfortunately the patient was lost to follow-up, due to missed clinic appointments. On re-presenting to ENT, a formal neurosurgical opinion was sought. However after a sudden deterioration in the patient’s condition and coexistent co-morbidity neurosurgery was withheld. The patient subsequently passed away.Conclusions: To our knowledge this is the first reported case of intracranial extension of a frontal mucocoele causing the psychiatric condition of frontal lobe syndrome in English literature. We also comment on the current recommended management for invasive paranasal sinus mucocoeles

Keywords: Mucocoele, Frontal Sinus, frontal lobe syndrome