Sinonasal polyps are commonly associated with
chronic sinusitis. Prompt and early diagnosis is essential
because of the burden of this disease on the patient. This
disease negatively affects the quality of life of the patients.
Sinonasal polyp should be suspected in patients with
chronic sinusitis that is recalcitrant to medical therapy
especially in resource-poor centers where endoscopy is not
readily available. I present a case of recalcitrant chronic
rhinosinusitis with a left ethmoidal polyp which was seen
on paranasal sinus computed tomography as a left antral
mucous retention cyst. Intraoperative findings showed a
polyp arising from the left ethmoidal sinus, extending into
the left antrum, mimicking a left antral mucous retention
Keywords : Left Ethmoidal Polyp, Mucous Retention Cyst, Paranasal Sinus, Chronic Sinusitis.