Moreover, prophylactic interstitial laser therapy in early pregnancy might obviate the technical and clinical difficulties in the presence of fetal decompensation in later pregnancy.
Limitations specific to the method consist of problems in achieving an alignment perpendicular to the walls in patients with low parasternal windows (partially amenable by using anatomical M-mode), and measurement difficulties in the presence of severe hypo- or akinesia due to previous infarction or severely compromised radial motion in advanced heart failure.
These landmark studies have been used to argue for the independence of speech comprehension from auditory memory capacity, on the basis that if patients exist who have 'pure' auditory short-term memory difficulties in the presence of normal speech comprehension, then normal speech comprehension does not rely upon intact auditory memory.
In addition, in the event of difficulty in detecting the presence of ascites by conventional ultrasonography due to miscellaneous reasons, such as noticeable obesity or posthepatic resection, ARFI imaging may be useful for suggesting the presence of ascites by measuring the spleen stiffness in an inexpensive and noninvasive way.
The overwhelming interference from glutathione may be the cause of the difficulty in confirming the presence of cAMP by tandem MS under the experimental conditions used.
On the other hand, the possible difficulty in establishing the presence of overweight or obesity was a disadvantage.
The main limitation seems to be the difficulty in detecting the presence of fatty liver when the infiltration is of less than 30% of the hepatic content.
But limitations to this technique also exist as illustrated above (difficulty in revealing the presence of amorphous compounds, existence of preferential orientations, and necessity to analyze specific angle ranges).
While nearly 95% of all operated cysts can be removed in their entirety, a major reported intraoperative difficulty lies in the presence of adhesions to the dural wall, which is the main causative factor of incomplete resection [9].
MR imaging, like other morphologic imaging techniques (endorectal ultrasonography and computed tomography) is hampered by interpretation difficulties in assessing the presence of residual tumor within areas of radiation-induced fibrosis [ 6].
