. Radiography and radio-therapeutics . FiH. 160.—Radiogram of a skull after operation for the removal of a foreign body. FOREIGN BODIES IN THE SKULL 187 lateral positions should suffice to indicate the position of the foreign body. The cross-thread method oflocalisation should be employed asa confirmatory Fig. 161.—Foreign body in region of superiormaxilla. Fig. 162.—Friignieul Ml shhip-joint. Localisation of Foreig-n Bodies in the Skull.—The methodsavailable are (a) stereoscopic ; (6) stereoscopic combined with MackenzieDavidson method. A simple method may be employed when it is not
. Radiography and radio-therapeutics . FiH. 160.—Radiogram of a skull after operation for the removal of a foreign body. FOREIGN BODIES IN THE SKULL 187 lateral positions should suffice to indicate the position of the foreign body. The cross-thread method oflocalisation should be employed asa confirmatory Fig. 161.—Foreign body in region of superiormaxilla. Fig. 162.—Friignieul Ml shhip-joint. Localisation of Foreig-n Bodies in the Skull.—The methodsavailable are (a) stereoscopic ; (6) stereoscopic combined with MackenzieDavidson method. A simple method may be employed when it is not possible to have access to the two methods referred to. It is one which any one possessing an X-ray installation can carry out, and which has proved useful in many instances. Three plates are required: (1) Right lateral, (2) left lateral, (3) antero-posterior. For the localising of foreign bodies in the head the skull is divided into sections by means of flexible wire. A piece of wire is fixed in the longitudinal diameter, extending from the nasion in front to the external occipital protuberance behind. A second wire is carried from the nasion through the centre of the external auditory meatus backwards to end below the occipital protuberance. A third wire is carried vertically over the skull from on
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