. Roentgen interpretation; a manual for students and practitioners . e with the suture line seen above it. the injury. In any fracture, when reduction has been poor or thecallus formation extensive, evidence of the deformity may persistfor life. The roentgenogram will often furnish evidence of value to thesurgeon aside from the position of the fragments, such as indica-tions of a pathological process in the bone or of the presenceof foreign bodies within the wound, and occasionally the earlyappearance of gas in the soft tissues as a result of infection withWelchs bacillus. FRACTURES 35 Skull.—
. Roentgen interpretation; a manual for students and practitioners . e with the suture line seen above it. the injury. In any fracture, when reduction has been poor or thecallus formation extensive, evidence of the deformity may persistfor life. The roentgenogram will often furnish evidence of value to thesurgeon aside from the position of the fragments, such as indica-tions of a pathological process in the bone or of the presenceof foreign bodies within the wound, and occasionally the earlyappearance of gas in the soft tissues as a result of infection withWelchs bacillus. FRACTURES 35 Skull.—From its structure the skull is subject to linear fractureswhich appear on the plate as thin black lines with sharp raggededges. They may run in any direction. They are to be differen-tiated from suture lines, diploic vessels and arterial grooves, all ofwhich have fairly definite courses, smooth margins and are lighter incolor. Fracture lines may open up sutures or follow bloodvesselmarkings, but they can usually be traced beyond the course of thesenormal Fig. 9.—Fracture of the base of the skull. The line of fracture is seen in the petrousportion of the temporal bone. Comminuted and stellate fractures are usually obvious. Adepressed fracture often appears as a white line because of overlap-ping of the margins of the break; whenever possible profile viewsof them should be obtained. Fractures of either the inner or the outer table appear as areasof slight irregularity in the density and structure of the limited to the base are frequently overlooked; a verticalprojection of the base in addition to an anteroposterior, postero- 36 FRACTURES AND DISLOCATIONS anterior and both lateral views should be a routine in searching forskull fractures. Cranial aerocele may develop following fracture through thesinuses, especially the frontal sinus. They are produced by theincreased air pressure within the nasal cavity when the patientsneezes or blows the nose. At thi
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