Seventeen cases of primary paranasal cyst are reported. The patients were between fourteen and eighty-one years old, with a peak in the sixth decade. Nine were males and eight were females. Six cases were of the maxillary sinus, six others were of frontal sinus, two of ethmoid sinus and one was of sphenoid sinus. The other two cases involved both the maxillary and ethmoid sinus. The wall of the cyst consisted of inflammed mucous membrane or fibro-collagenous tissue. The epithelium was comprized of squamous cells or columnar cells and in some cases, there were no epithelium. Only three of the seventeen cases had a history of chronic sinusitis and one had allergic rhinitis, but seven other cases seemed to have inflammation in paranasal sinuses from X-ray findings.