Limitations of ABVS Technique
In this chapter, limitations of the ABVS technique are summarized. Some drawbacks of the ABVS method such as impossibility of scanning of the axillary region; a high number of false-positive results, resulting in second-look HHUS; movement artifacts durin
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Limitations of ABVS Technique
ABVS technology has some limitations. Automated breast ultrasound is limited in women with macromastia and pronounced ptosis [1, 2]. Isobe et al. [3] pointed out some difficulties in the scanning of large breasts and the retroareolar area despite the large scanning surface. Furthermore, they presume that even with optimal scanning technique, the peripheral areas of the breast parenchyma are not fully covered by ABVS [3]. Therefore, some areas of the breast, such as deep lateral areas, do not have proper visualization and complete coverage using ABVS. The scanning field of 17 cm does not allow the inclusion of the entire volume of the breast in a single scan for patients with a bra cup size (F) or more (Fig. 5.1). This reduces the diagnostic value of ABVS when compared with conventional two-dimensional ultrasound [3]. In our view this arises only with coronal scans, in which the outer portions of the gland are not so compressed and could not be evaluated so thoroughly, but we used some special projections in which a patient lies on her side for scanning the lateral portion of the gland or shifting the breast laterally for scanning medial portions of the gland. Similarly we use the technique of shifting the breast down for scanning the upper part and upward for scanning the inferior part. If a mass is detected in the lower or inner quadrants on the mammogram, it is possible to supplement the study by scanning from the mediolateral view or separately capture the lower quadrants. These scanning principles will result
in better visualization of the tissues of the subsequent zones [4]. Therefore, we recommend in such cases to follow the principle of sequential study of all zones of interest with maximum capture of all areas and obtaining additional views of quadrants not included in the initial view. There is no experience in examining the axillary region with ABVS, although it is of special importance in breast cancer diagnosis. Today, sentinel node biopsy is the standard therapy for women at the preoperative stage with a negative nodal status, which requires ultrasound of the axilla [5]. Furthermore, lymph node alterations may be the first sign in mammographically and/ or sonographically occult breast cancer or other malignant diseases. Therefore, additional conventional ultrasound of the axilla would be necessary after a suspicious ABVS scan. This drawback of ABVS is noted by all researchers, and this limits the possibility of using this method for screening [6–14]. In our clinical experience, we faced a case of false-negative diagnosis of multifocal breast cancer localized in the axillary process. Retrospective analysis of the whole array of stored ultrasound data showed that the tumor was located outside the scanning field. It was impossible to cover the axillary process completely at a volume scan, and therefore we could not view the tumor by processing the entire array of 3D data (Fig. 5.2). To avoid such false-negative cases, the patient should initially be examined with convention
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