In conclusion, the attempt has been made to demonstrate that three major forms of new bone formation exist: reactive, neoplastic, and the newborn or relative skeletal sclerosis in congenital (developmental) disorders. A classification of skeletal disorders has been presented and four major groups have been selected from the nine categories in this classification. These are: congenital-developmental, metabolic and endocrine, benign neoplasms and malignant neoplasms. In all four categories a large group of entities which may present with new bone (sclerosis) are listed and are discussed in some, but limited, detail. A number of these entities in each of the four categories are illustrated. Some difficulty is encountered in considering the mechanisms for the production of bony sclerosis in the group of congenital-developmental disorders. In such entities as osteopetrosis, the overproduction of cartilage cords and subsequent excessive mineralization is known to be responsible for the dense bone. However, in various skeletal dysplasias (e.g., pyknodysostosis, van Buchem disease), the exact mechanism for the development of the diffuse sclerotic process is not clearly understood. In the metabolic and endocrine category, the situation as to mechanism is less unclear in considering the reason for the development of bony sclerosis. Yet even in evaluating disorders such as renal osteodystrophy, the reactive bony sclerosis in the presence of secondary hyperparathyroidism and osteomalacia is a source of speculation with no definite proof, as yet.

Adolescent↗

PubMed1984

Machines and people: who and what are important?

Explore the source record for details and available documents.

Health Services↗

PubMed1984

The Residency Review Committee for Radiology: its organization, function, and performance in diagnostic radiology.

The accreditation process for training in radiology is managed by the Residency Review Committee for Radiology under a prescribed system. That system and the actions taken by the Committee in recent years are described. Most applications for new or continuing programs in 1975-1981 were approved. An analysis of the adverse actions of the Committee indicates the most common deficiencies were inadequate clinical experience in subspecialty areas, inadequate formal teaching, and understaffing of the clinical program. Certain trends in radiology are apparent. The numbers of programs in diagnostic and therapeutic radiology have not changed significantly over the past 5 years, whereas opportunities for training in nuclear radiology have increased greatly. The number of trainees in diagnostic radiology has increased 13% during this period; the number in radiation therapy remains unchanged. The number of women trainees in diagnostic radiology has increased from 15% to 22%, and the number of foreign graduate trainees has decreased from 19% to 11%.

Accreditation↗

PubMed1984

Systemic disorders affecting the thoracic cage.

Conventional chest roentgenograms provide an opportunity to study changes in the thoracic cage produced by systemic or localized disorders. Careful evaluation of abnormalities often gives a clue to the diagnosis of clinically unsuspected disorders. In this article, the authors present a review of developmental, granulomatous, collagen vascular, hematopoietic, metabolic, endocrine, and neoplastic disorders affecting the thoracic cage.

Acromegaly↗

PubMed1983