. Roentgen interpretation; a manual for students and practitioners . 59.—Tumor of the brain located in the frontal lobe. The plate shows localized pressure atrophy. Brain Tumor.—Brain tumor rareh gi^es direct e-\idence of itspresence. Localized erosion of the cah^arium o^er the lesion orincreased density due to new bone formation by the dura overhingit or, very rarely, calcification in the mass itself ma^ help to localizethe process. In 90 per cent, of the cases all that appears on the plateis the evidence of intracranial pressure and the common findingsare compression or destruction of the po
. Roentgen interpretation; a manual for students and practitioners . 59.—Tumor of the brain located in the frontal lobe. The plate shows localized pressure atrophy. Brain Tumor.—Brain tumor rareh gi^es direct e-\idence of itspresence. Localized erosion of the cah^arium o^er the lesion orincreased density due to new bone formation by the dura overhingit or, very rarely, calcification in the mass itself ma^ help to localizethe process. In 90 per cent, of the cases all that appears on the plateis the evidence of intracranial pressure and the common findingsare compression or destruction of the posterior clinoid processes,enlargement of the bloodvessel channels distributed to the affected SELLA 85 area and, at times, increased impressions of the cerebral convolu-tions. In severe cases separation of one or more suture lines maybe present. Subdural Hemorrhages.—Subdural hemorrhages cannot be diag-nosed on the roentgenogram. Thin areas in the temporal region orareas of increased density in the parietals are often erroneouslypointed out as Fig. 60.—Pituitary tumor. The sella is enlarged and its floor destroyed. Sella.—True lateral views, preferably stereoscopic, are essentialfor the proper observation of Uie sella. It is subject to considerablevariation both in size and shape, of which the latter is the moreimportant. As already noted, deformity of the posterior clinoidsmay occur as a result of tumor in any portion of the brain. Hypo-physeal tumors cause a ballooning of the sella with thinning of thefloor and usually of both anterior and posterior clinoid with these changes may be seen more or less enlargementof the sinuses, elongation of the mandible and general enlargement 86 SKULL of the bones, particularly those of the hands and feet. The clinoidsoccasionally meet, bridging in the roof of the sella. Attention hasbeen called to the fact that this is a common occurrence in epilepsyand sterility. (Faulty technic in securing view
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