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Although “march fractures” of the metatarsals have been encountered with increasing frequency (2, 6, 12, 13), similar “stress”, fractures in the other weight-bearing bones are apparently much less common. More than 200 metatarsal march fractures have been observed at the authors' station, but until recently none had been seen in other bones. Three instances of march fracture in the tibia were then encountered within two months, and a search of the files revealed a fourth case. Pfahler (10) reported a single instance of this type of fracture of the tibia at the meeting of the American Roentgen Ray Society in 1939. This “insufficiency fracture” had occurred in a high-school athlete. The fracture line was narrow, incomplete, and extended only through the thickness of the cortex. The callus resembled an osteogenic sarcoma, and Pfahler stated that up to that time he had never seen a fracture of this kind. Barth, in discussing the report, remarked that no such case had been seen in his clinic. Pfahler commented...

Numerous articles have appeared in the literature concerning the bacteriologic and clinical aspects of primary atypical pneumonia, and sporadic attempts have been made to establish roentgenologic criteria for its differentiation from bacterial pneumonia. As Rigler (1) put it, “in the case of acute lung conditions the roentgenogram presents an autopsia in vivo, requiring only adequate and intelligent interpretation to make it the most valuable adjunct in the diagnosis and study of pneumonia.” Bowen (2), in 1935, was one of the first to describe the clinical syndrome now designated as “primary atypical pneumonia,” which he called “acute influenza pneumonitis.” His description of the characteristic roentgen appearances of this syndrome has remained fairly constant throughout the literature. The roentgen shadow is usually described as extending outward from the hilum well into the parenchyma, occasionally reaching the periphery, presenting the appearance of a confluent mottled fan-shaped or rounded area, usua...