. Roentgen interpretation; a manual for students and practitioners . ^ in cases of obstruction due to adhesions or malignancy. EECTUM. The rectum appears as a smooth, S-shaped mass, occupying aconsiderable portion of the pelvis. Defects in outline are due tocarcinoma which show the ragged, annular lesions typical of thedisease, llceration due to lues or tuberculosis may be evidencedby more or less infiltration of the wall which becomes rigid. Thediameter of the intestine is diminished rather uniformly throughoutthe area of the lesion. Pressure from inflammatory masses or tumorin the pelvis may


. Roentgen interpretation; a manual for students and practitioners . ^ in cases of obstruction due to adhesions or malignancy. EECTUM. The rectum appears as a smooth, S-shaped mass, occupying aconsiderable portion of the pelvis. Defects in outline are due tocarcinoma which show the ragged, annular lesions typical of thedisease, llceration due to lues or tuberculosis may be evidencedby more or less infiltration of the wall which becomes rigid. Thediameter of the intestine is diminished rather uniformly throughoutthe area of the lesion. Pressure from inflammatory masses or tumorin the pelvis may deform or displace the rectal Fig. 163.—This plate shows a fairly typical group of gall-stone shadows. GALL-BLADDER. Visualization of the gall-bladder is a matter of thorough, carefultechnic and a certain amount of luck. The patient must suspendrespiration completely and the exposure and position of the central GALL-BLADDER 187 ray may be just right for the particular patient. It is an exaggera-tion to say that every gall-bladder which can be visualized is patho-logical. However, it is undoubtedly true that a large proportionof pathological gall-bladders can be visualized by careful shadow of the gall-bladder is rounded and sharply margined;


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