Bone scanning in neonatal subcutaneous fat necrosis.

abscesses—particularly subdiaphragmatic—are difficult to detect utilizing this modality. In ultrasonography on the other hand, the presence of the liver is quite useful, for it dis places bowel that might otherwise block sound transmission due to its gas content, and thus renders this area ideal for ultrasonic search. Similarly, in the pelvis, the presence of a filled bladder allows detailed ultrasonic exploration. It is in the area in between,where the presenceof bowel gas seri ously interferes with ultrasonography, that Ga-67 scanning may be superior, although large bowel activity often poses difficulties in interpretation here. In practice, of course, one often does not know in ad vance the most likely area of involvement. Nevertheless, it is worthwhile bearing these divisions in mind.