Nasopharyngeal cylindrical cell papilloma.

INTRODUCTION: Cylindrical cell papillomas are rare tumours which usually arise in the sinonasal region. CASE REPORT: We report a case of a nasopharyngeal cylindrical cell papilloma in a 56-year-old man who presented with a four-month history of right-sided hearing loss, otalgia, vertigo and tinnitus. Investigation revealed a soft, nodular lesion obstructing the pharyngeal opening of the right eustachian tube; this was treated by wide endoscopic excision. CONCLUSION: Cylindrical cell papilloma is a possible cause of eustachian tube obstruction in adults. Effective treatment of these lesions usually requires wide endoscopic excision, in order not to miss coexistent carcinoma.

A simple optical device for measuring free surface deformations of nontransparent liquids.

In this paper, a novel optical device for measuring the deformation of liquid free surfaces is presented. The device employs a laser beam, which can be focused on any chosen location on the free surface. The key measurement is of the intensity of the beam reflected from a location on the free surface where the deformation exhibits a local extremum. The optics of the device is so designed as to measure a maximum intensity when the distance between the focusing lens and the selected point on the free surface is equal to the focal length, thus enabling a height measurement. The device is tested in ferrofluid pools where the height of the spikes of the normal field instability is measured. The simplicity of the suggested technique enables the fabrication of a quite cheap device for measuring surface deformation of nontransparent liquids, which provides good accuracy and reproducibility.