Cylindrical cell papilloma. Report of a case with light and ultrastructural analysis.

The clinicopathologic features of an additional case of cylindrical cell papilloma are reported. This tumor is relatively rare, with approximately twenty cases recorded under that name in the literature. Surgical correction of papillomas in the nose and paranasal sinuses is discussed. Ultrastructural analyses suggest that cylindrical cell papilloma may possibly be an oncocytic lesion and thus different from the inverted and fungiform types.

Benign fibro-osseous jaw lesions of periodontal membrane origin. An analysis of 249 cases.

An analysis of the clinical, radiographic, histologic and follow-up data on 249 cases of lesions of periodontal membrane origin is presented. Such lesions may be cementoid, osteoid, mixed (cemento-osteoid) or fibrous. These tumors may be single or multiple and usually behave in a benign fashion. Occasionally they may act in an aggressive manner and attain giant size, although none metastasize. The benign fibro-osseous lesions of periodontal membrane origin are more prevalent in the jaws than fibro-osseous lesions of medullary bone origin. The use of polarized light was most helpful in distinguishing mature cementoid lesions from tumors with mature lamellar bone; the former have finer lines of parallel birefringence. Fibrous dysplasia has often been misused as a diagnostic term and was found not to be prevalent as a fibro-osseous jaw lesion. Fibrous dysplasia has its own particular histologic features, and the immature "woven" bone within the lesion polarizes in a random birefringent pattern.