Intraoral blue (Jadassohn-Tieche) nevus.

Blue nevus of the oral mucosa is a distinctly uncommon clincial entity. Careful review of the literature yielded thirty-one previously reported cases. The present article reports the occurrence of a blue nevus of the hard palate in a 58-year-old man.

Nasal and paranasal sinus polyposis. Current concepts in radiologic diagnosis and surgical therapy.

We believe that hypocycloidal tomography is the method of choice in the pre and postoperative evaluation of chronic nasal and paranasal sinus polyposis, based on the radiographic examinations of 80 patients who have undergone intranasal ethmoidectomy. Although our overall study is incomplete at this time due the extended period necessary for follow-up, we hope that the basic information which is now available will be beneficial to others.

Angiographic demonstration of a calcified splenic hamartoma.

A case of hamartoma of the spleen is reported. Radiographic examination revealed a mass containing innumerable calcifications in the left upper quadrant. Angiography demonstrated an avascular mass.

Animal model of sensitization by inhalation.

Groups of rats exposed to daily inhalation challenge with aerosolized pigeon serum developed precipitating antibody within 2 weeks and definitive granulomatous inflammatory changes in the lung after 7 weeks of exposure. The dissociation of the two responses to an inhalation challenge indicate that the rat model may serve for screening of the various inhalant antigens for their sensitizing potential, and for investigation of the contributory role of some of the factors involved in the pathogenesis of hypersensitivity pneumonitis.