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Original Research
Women's Imaging
October 2006

Lobular Neoplasia at 11-Gauge Vacuum-Assisted Stereotactic Biopsy: Correlation with Surgical Excisional Biopsy and Mammographic Follow-Up

Abstract

OBJECTIVE. The objective of our study was to evaluate the outcome of lobular neoplasia diagnosed at 11-gauge stereotactic vacuum-assisted biopsy (SVAB).
MATERIALS AND METHODS. Retrospective review of 1,819 lesions sampled with 11-gauge SVAB yielded 27 patients with lobular neoplasia as the most severe pathologic entity diagnosed. Patients with lobular neoplasia associated with atypical ductal hyperplasia (ADH), ductal carcinoma in situ (DCIS), or infiltrating carcinoma were excluded. Twenty patients underwent surgical excisional biopsy, and seven patients were followed mammographically for a mean of 52 months (range, 14-67 months). Mammographic lesion type, number of specimens obtained per lesion, and specific histologic features related to lobular carcinoma in situ (LCIS) were assessed. Results were compared with histologic findings at surgery or mammographic follow-up.
RESULTS. Nineteen lesions presented mammographically as microcalcifications, four as masses, three as masses with associated microcalcifications, and one as architectural distortion. A mean of 13 specimens were obtained per lesion. Carcinoma was found at surgical excision in 19% of the lesions (5/27). Lesions were upgraded to DCIS (n = 2), invasive lobular carcinoma (n = 2), and mixed invasive ductal and lobular carcinoma (n = 1). In addition to the diagnosis of lobular neoplasia at SVAB, one patient presented with synchronous infiltrating ductal carcinoma in the contralateral breast, and two patients developed metachronous infiltrating ductal carcinoma in a different quadrant of the ipsilateral breast. Twelve of the 27 lesions included LCIS. These lesions were evaluated pathologically to distinguish the classic (10/12) from the pleomorphic (2/12) form of this entity. Ten of the 12 LCIS cases underwent surgical excisional biopsy with four of the five upgrades occurring in these patients. Only one of these patients was shown to have the pleomorphic type of LCIS. Lesions in seven patients who underwent mammographic follow-up remained stable.
CONCLUSION. The known association of lobular neoplasia with high-risk and malignant lesions at surgical biopsy requires careful consideration when lobular neoplasia is diagnosed as the most severe histologic entity at SVAB. The diagnosis of lobular neoplasia at 11-gauge SVAB is not reliable in view of the 19% upgrade rate at the time of surgical excisional biopsy in our study. No predictive mammographic features allowed distinction between the patients with lesions that were upgraded at the time of surgery from those whose lesions were not upgraded.

Introduction

The term “lobular neoplasia” is a collective one used by pathologists to include a spectrum of proliferative changes ranging from atypical lobular hyperplasia (ALH) to lobular carcinoma in situ (LCIS) [1]. This is an infrequently encountered entity identified at percutaneous biopsy, with reported rates ranging from 1.6% to 1.8% for lobular neoplasia [2, 3], 0.2% to 1.2% for LCIS [4-7], and 0.05% to 3.3% for ALH [4, 5, 8]. Lobular neoplasia is frequently multifocal and bilateral and is considered to be a high-risk tumor marker that is associated with an increased incidence of malignancy in both breasts [9-12]. Lobular neoplasia is thought to be an incidental finding at breast biopsy, without a mammographic correlate [9, 10]. However, Georgian-Smith and Lawton [13] described microcalcifications associated with LCIS. Therefore, in some cases, the diagnosis of lobular neoplasia may be concordant with targeted microcalcifications.
Although most clinicians agree that close clinical and mammographic follow-up is appropriate in cases diagnosed with surgical biopsy, management of these lesions diagnosed at percutaneous biopsy remains controversial. Some investigators advocate surgical excision to exclude sampling error and a more serious pathologic diagnosis. Other investigators point to the fact that because the risk of developing breast cancer involves all breast tissue, surgical excision of one region is not indicated and mammographic follow-up is more appropriate [2-8, 13-16]. Certain parameters for surgical excision have been suggested, which include lesions with features that overlap with those of DCIS, an associated high-risk lesion, mammographic-pathologic discordance, or residual calcifications [3, 7]. Because this entity is infrequently encountered, most published reports have included small numbers of patients, and the lesions were biopsied with a variety of biopsy devices and needle gauges. Our study was designed to determine whether the diagnosis of lobular neoplasia is reliable when identified exclusively with an 11-gauge vacuum-assisted biopsy device. Our hypothesis was that the larger specimens obtained by the 11-gauge vacuum-assisted biopsy device compared with the 14-gauge spring-loaded device and 14-gauge vacuum-assisted biopsy device could provide more accurate histologic sampling and allow mammographic surveillance rather than surgical excision.

Materials and Methods

From January 1999 to December 2004, 1,819 stereotactic biopsies were performed at one institution using an 11-gauge vacuum-assisted probe (Mammotome, Ethicon Endo-Surgery) and a dedicated prone table (Mammotest, Fischer Imaging). An institutional review board-approved retrospective review of these records was performed to identify cases in which lobular neoplasia was identified histologically without associated atypical ductal hyperplasia (ADH), ductal carcinoma in situ (DCIS), or infiltrating carcinoma. All cases were reevaluated by a single breast pathologist. In cases with associated high-risk lesions (ADH, radial scar, or papillary lesions) or carcinoma, surgical excision was routinely recommended. In cases in which lobular neoplasia was the most severe pathologic entity encountered, surgical excision was not routinely recommended but was frequently performed, particularly later in the study period. This change in protocol reflected growing experience both at our center and in the literature indicating the potential for associated malignancy. Our current protocol is to recommend surgical excision for lobular neoplasia.
A retrospective review of our institution's biopsy database was performed by a dedicated breast radiologist. The information obtained included the stereotactic core needle biopsy histologic findings, initial mammographic features of the lesion, lesion size, BI-RADS assessment category, number of cores obtained at biopsy, patient age, presence of residual lesion mammographically after SVAB, and outcome based on surgical histology or mammographic follow-up (Table 1).
TABLE 1: Mammographic Findings and Histologic Results
Lesion TypeSVAB PathologyLCIS MorphologyResidual LesionSurgical Pathology
MassALH, LCISPleomorphicYesALH, LCIS, ADH
CalcificationsALH NoALH
CalcificationsALH Yes 
CalcificationsLCISClassicNoFibrocystic change
MassALH No 
CalcificationsALH, LCISClassicNo 
CalcificationsALH YesALH, ADH
MassALH NoFibrocystic change
CalcificationsLCISClassicYes 
MassALH NoALH, fibrocystic change
CalcificationsALH No 
CalcificationsLCISClassicNoFibrocystic change
CalcificationsLCISClassicNoLCIS, ADH, infiltrating lobular carcinoma
CalcificationsALH No 
CalcificationsLCISClassicYesALH, LCIS
Mass and calcificationsALH NoFibrocystic change
Mass and calcificationsALH, LCISClassicYesADH, DCIS
CalcificationsALH NoFibrocystic change
CalcificationsLCISClassicNoLCIS, DCIS
CalcificationsLCISClassicNoALH, LCIS
CalcificationsALH NoInfiltrating ductal and lobular carcinoma
Mass and calcificationsALH YesADH, fibrocystic change
CalcificationsALH Yes 
CalcificationsALH YesALH, LCIS
Architectural distortionLCISPleomorphicYesLCIS, infiltrating lobular carcinoma
CalcificationsALH NoFibrocystic change
Calcifications
LCIS
Classic
No
Fibrocystic change
Note–SVAB = stereotactic vacuum-assisted biopsy, LCIS = lobular carcinoma in situ, ALH = atypical lobular hyperplasia, ADH = atypical ductal hyperplasia

Results

Lobular neoplasia (ALH or LCIS) was identified in 27 (1.5%) of the 1,819 stereotactic core needle biopsies. Of these 27 cases, there were nine cases of LCIS, 15 cases of ALH, and three cases in which both entities were identified. Four cases of lobular neoplasia were masses, 19 cases manifested as microcalcifications, three were cases of a mass with associated microcalcifications, and there was one case of architectural distortion (Fig. 1). The mean lesion size was 7 mm (range, 2-20 mm). Twenty-three cases were assessed as BI-RADS category 4, one as BIRADS category 5, and three as BI-RADS category 3. The decision to biopsy in each of the BI-RADS category 3 cases was based on high-risk status (strong family history) and patient or physician preference. None of the lesions was sonographically visible. A mean of 13 cores were obtained (range, 11-19). The mean patient age at the time of SVAB was 57 years (range, 40-74 years). Twenty of the patients (74%) underwent surgical excisional biopsy, and seven patients (26%) were followed mammographically.
At excisional biopsy, five (19%; 95% CI, 3.9-33.2%) cases of carcinoma, including two cases (7%) of DCIS and three cases (11%) of invasive carcinoma, were identified (invasive lobular carcinoma in two cases and mixed invasive ductal and lobular carcinoma in one case). Of the upgraded cases, the initial histologic findings at SVAB were LCIS in three, ALH in one, and both LCIS and ALH in one. Synchronous findings at surgery included infiltrating ductal carcinoma in the contralateral breast in one of these upgraded patients (Table 2). Two other patients developed metachronous infiltrating ductal carcinoma in a different quadrant of the ipsilateral breast 10 and 37 months after the initial SVAB. Excision of the sites of previous SVAB at that time showed no carcinoma.
TABLE 2: Atypical Lobular Hyperplasia (ALH) Cases at Stereotactic Vacuum-Assisted Biopsy
Lesion TypeSurgical PathologyResidual Lesion
CalcificationsALHNo
Calcifications Yes
Mass No
CalcificationsALH, ADHYes
MassFibrocystic changeNo
MassALH, fibrocystic changeNo
Calcifications No
Calcifications No
Mass and calcificationsFibrocystic changeNo
CalcificationsFibrocystic changeNo
CalcificationsInfiltrating ductal and lobular carcinomaNo
Mass and calcificationsADH, fibrocystic changeYes
Calcifications Yes
CalcificationsALH, LCISYes
Calcifications
Fibrocystic change
No
Note—ADH = atypical ductal hyperplasia, LCIS = lobular carcinoma in situ
Fig. 1 59-year-old woman with classic form of lobular carcinoma in situ who underwent stereotactic vacuum-assisted biopsy. Pleomorphic calcifications are identified on magnification mammogram image of right breast.
The seven patients who underwent mammographic surveillance were followed for a mean of 52 months (median, 56 months; range, 14-67 months). No mammographic changes had occurred at the site of SVAB.
In 17 cases, there was no mammographic evidence of residual lesion after SVAB, including three of the five cancers identified at subsequent surgical excision.
The histologic features of the cases of LCIS were retrospectively evaluated and characterized as the classic or pleomorphic type. Ten (83%) of 12 LCIS cases were of the classic form (Figs. 2A and 2B), and two (17%) of 12 were the pleomorphic form (Fig. 3). Ten of these 12 patients underwent surgical excisional biopsy. Four of the five upgrades from surgery occurred in these patients, including one patient with the pleomorphic form of LCIS (Tables 3 and 4).
TABLE 3: Lobular Carcinoma In Situ (LCIS) Cases at Stereotactic Vacuum-Assisted Biopsy
Lesion TypeSurgical PathologyLCIS MorphologyResidual Lesion
CalcificationsFibrocystic changeClassicNo
Calcifications ClassicYes
CalcificationsFibrocystic changeClassicNo
CalcificationsLCIS, ADH, infiltrating lobular carcinomaClassicNo
CalcificationsALH, LCISClassicYes
CalcificationsLCIS, DCISClassicNo
CalcificationsALH, LCISClassicNo
Architectural distortionLCIS, infiltrating lobular carcinomaPleomorphicYes
Calcifications
Fibrocystic change
Classic
No
Note–ADH = atypical ductal hyperplasia, ALH = atypical lobular hyperplasia, DCIS = ductal carcinoma in situ
TABLE 4: Atypical Lobular Hyperplasia (ALH) and Lobular Carcinoma In Situ (LCIS) Cases at Stereotactic Vacuum-Assisted Biopsy
Lesion TypeSurgical PathologyLCIS MorphologyResidual Lesion
MassALH, LCIS, ADHPleomorphicYes
Calcifications ClassicNo
Mass and calcifications
ADH, DCIS
Classic
Yes
Note–ADH = atypical ductal hyperplasia, DCIS = ductal carcinoma in situ

Discussion

“Lobular neoplasia” is a collective term used by pathologists to include a spectrum of proliferative breast changes that range from ALH to LCIS [1]. Both ALH and LCIS manifest as proliferations of epithelial cells lining the terminal ducts and acini. The epithelial cells are larger than normal, with pale cytoplasm and round regular nuclei. These neoplastic cells eventually fill, distend, and obliterate the acini. Although the acini of the lobules are more generally involved, the ducts are also often affected [1]. The distinction between ALH and LCIS is usually based on the degree of involvement of acini in the terminal ductal lobular unit [4, 17, 18].
Lobular neoplasia is frequently multicentric and bilateral. It has been regarded as a highrisk tumor marker, diagnosed primarily in premenopausal women [1]. The estimated risk of developing invasive carcinoma in either breast is approximately five times the rate in the general population. The risk of developing cancer among these patients remains elevated for at least 20 years after the initial diagnosis of lobular neoplasia. The majority of the cancers that develop are invasive ductal carcinomas [9].
Lobular neoplasia is a relatively uncommon finding, with reported rates ranging from 0.8% to 3.8% at breast surgery [1]. At percutaneous core needle biopsy, the reported rates of lobular lesions range from 0.02% to 3.3% [3-8]. In our series, these lesions were found in 1.5% (27/1,819) of all stereotactic core needle biopsies. Liberman et al. [7] have suggested that the incidence of lobular neoplasia detected at percutaneous biopsy will increase with the use of larger needles and vacuum assistance, providing tissue volumes that approach those of surgical biopsy.
In contrast to ductal lesions, lobular neoplasia generally has no clinical or mammographic manifestations [4, 9]. It is usually encountered incidentally at biopsy of a targeted coexistent entity [18]. Recently, however, mammographically evident calcifications have been described in association with lobular lesions [7, 13, 18]. Pathologically, two forms of calcifications are recognized with LCIS [13]. A pleomorphic, necrotic form of LCIS has been described in which the calcifications are associated with necrotic debris and closely resemble the comedocarcinoma calcifications of high-grade DCIS. The classic, nonnecrotic form of LCIS is associated with calcifications that are similar in appearance to those found in benign proliferative change [13]. It has been suggested that the pleomorphic form of LCIS may be associated with a greater likelihood of developing invasive carcinoma than the classic form [13].
The clinical significance of these two forms of LCIS is particularly relevant for patients undergoing stereotactic core needle biopsy. In patients diagnosed with the pleomorphic form of LCIS at stereotactic core needle biopsy, further surgical excision may be warranted to exclude sampling error and underestimation of invasive carcinoma, analogous to the upgrade issues associated with ADH and DCIS [13, 15]. Furthermore, although LCIS and DCIS are distinct entities, their pathologic features can overlap, and histologic differentiation can be difficult. Use of E-cadherin immunohistochemical staining has helped in making the distinction between ductal and lobular neoplasms. Again, this is clinically significant because, as Georgian-Smith and Lawton [13] pointed out, “cases that were previously considered to be DCIS because of necrosis are now being determined to be LCIS (pleomorphic type).”
The experience with LCIS as a high-risk marker rather than a precursor to carcinoma may be based on the exclusion of these more aggressive forms of LCIS, which may have been classified and treated in the past as DCIS. This possibility, coupled with the known association of lobular neoplasia with high-risk and malignant lesions at surgical biopsy [1], requires careful consideration of lobular neoplasia diagnosed as the most severe histologic entity at stereotactic core needle biopsy. In addition, lobular neoplasia may be a part of a spectrum of changes that progress to malignancy, paralleling the changes of ADH that progresses to DCIS, but occurring more slowly [19].
The management of these cases is not well established. Recommendations include excisional biopsy, mammographic follow-up, chemoprevention, or a combination of these approaches [18]. The advantages of percutaneous core needle biopsy compared with surgical excisional biopsy have been well established. These procedures are increasingly being used as the primary means of evaluating suspicious areas of breast tissue. However, because of sampling error inherent in any form of needle biopsy and interpretive errors, which may arise from smaller tissue specimens than those obtained at surgery, the issue of underestimation of malignancy must be addressed. This has been extensively investigated with regard to ADH diagnosed at percutaneous core needle biopsy. Multiple studies have shown that carcinoma can be underdiagnosed as ADH on the basis of findings at core needle biopsy [8, 20]. The current recommendation for a diagnosis of ADH at core needle biopsy is to undergo surgical excisional biopsy to exclude the possibility of coexistent but unsampled DCIS or invasive carcinoma [18]. Similarly, several studies have raised the question as to whether a diagnosis of lobular neoplasia at stereotactic core needle biopsy is a reliable and accurate diagnosis [3-8, 18, 21]. If, as in the case of ADH, the potential exists for a sampling or interpretive error to misdiagnose a more aggressive lesion than lobular neoplasia alone, surgical excision may be necessary. Liberman [17] investigated the percutaneous diagnosis of LCIS and recommended excision “when the percutaneous biopsy histologic features overlapped with those of DCIS, when a high-risk lesion was present, or when there was imaging-histologic discordance.” However, a greater diagnostic dilemma exists when lobular neoplasia is diagnosed at percutaneous biopsy and there is no other finding that warrants surgical excision. The question asked in our study is whether the diagnosis of lobular neoplasia is reliable enough in these cases to avoid surgical excision and permit mammographic surveillance as management for these patients. Our findings suggest that this management strategy may not be appropriate.
Previous reports have included both 14- and 11-gauge needles and both spring-loaded and vacuum-assisted devices. We questioned whether the larger tissue specimens provided by the 11-gauge vacuum-assisted biopsy device would provide greater histologic accuracy and allow confident management of lobular neoplasia based solely on the percutaneous biopsy results. However, our study, performed exclusively with an 11-gauge vacuum-assisted biopsy device, still showed upgrades from lobular neoplasia to carcinoma. In fact, three of the five cases in which lobular neoplasia was upgraded to carcinoma at the time of surgical excision occurred in patients with no mammographic evidence of residual lesion after SVAB. So, again, similar to the situation with ADH, although the 11-gauge vacuum-assisted biopsy device may decrease the frequency of upgrades, it does not eliminate this possibility.
Fig. 2A 53-year-old woman with classic form of lobular carcinoma in situ who underwent stereotactic vacuum-assisted biopsy. Note expansion of lobular unit by uniform cells. Arrows mark calcifications, which were also identified mammographically.
Fig. 2B 53-year-old woman with classic form of lobular carcinoma in situ who underwent stereotactic vacuum-assisted biopsy. Note uniformity of proliferating lobular cells at higher magnification.
Fig. 3 59-year-old woman with pleomorphic form of lobular carcinoma in situ who underwent stereotactic vacuum-assisted biopsy. Note lack of uniformity and atypical changes within proliferating lobular cells.
In the study by Berg et al. [3], 25 foci of lobular neoplasia (15 ALH, 10 LCIS) were identified in or adjacent to a targeted benign finding. That study viewed patients with residual microcalcifications after percutaneous core needle biopsy as having a higher risk of cancer. Of 11 lesions with residual calcifications, one (9%) was DCIS at subsequent surgery. Excisional biopsy was suggested for cases of lobular neoplasia with the presence of residual microcalcifications after percutaneous core needle biopsy [3]. In a multiinstitutional study by Lechner et al. [5], 34% (20/58) of LCIS cases and 21% (18/84) of ALH cases were associated with malignancy at surgical excision. Irfan and Brem [8] evaluated seven cases of ALH diagnosed at 8-gauge SVAB. Subsequent surgical excision revealed cancer in one case (14%). Shin and Rosen [18] evaluated 14 cases of LCIS and six cases of ALH found on core biopsy. Subsequent excisional biopsy yielded carcinoma in 21% (3/14) of LCIS cases and 17% (1/6) of ALH cases [18]. Similarly, Foster et al. [22] reported the combined results of two institutions and found that 17% of patients with LCIS or ALH at core needle biopsy (35 cases) were upgraded to invasive cancer or DCIS. Cohen [19] combined the data from several of these reported studies and found that 30 (19%) of 159 published reports of ALH, LCIS, or lobular neoplasia were upgraded at the time of excisional biopsy to DCIS or invasive cancer. Dmytrasz et al. [23] reported seven cases of ALH at stereotactic biopsy with three cases of cancer found at surgery. Bauer et al. [24] reported 13 cases of lobular neoplasia without associated cancer or high-risk pathology at core needle biopsy, with one upgrade at excisional biopsy.
These studies reported results that are similar to ours. Although the number of cases in each of the series is small, together, there is a growing body of evidence to support surgical excision in cases of lobular neoplasia identified as the most significant pathologic entity at core needle biopsy.
In our report of 27 patients with lobular neoplasia as the most significant histologic finding at SVAB, there were five cancers (19%) at surgical excision. Because lobular neoplasia is not a commonly encountered entity, as with previous reports, the small number of cases limits our study. Nonetheless, our report represents the largest single institution series and the largest series of cases performed exclusively with an 11-gauge vacuum-assisted biopsy device.
A second limitation of our study is that not all cases had surgical correlation. However, the majority of our cases underwent surgical excision (20/27, 74%). Those with mammographic surveillance (7/27, 26%) had a mean follow-up of greater than 4 years.
All of our cases underwent initial percutaneous biopsy with an 11-gauge vacuum-assisted biopsy device. Despite the greater efficiency of vacuum assistance in obtaining microcalcifications compared with the spring-loaded device and the larger tissue specimens obtained with the 11-gauge needle, we still encountered a 19% incidence of carcinoma at the time of surgery.
We have attempted to address a number of the issues discussed by Dershaw [25] in his recent editorial. Our data add a significant number of cases to the published literature. We included only those cases of lobular neoplasia without coexistent cancer or high-risk disease that would require surgical excision to be performed. In all of our cases, biopsy was performed with an 11-gauge vacuum-assisted biopsy device. The mammographic features of the lobular lesions were evaluated and the histopathologic features of all cases of LCIS.
In conclusion, we recommend that excisional surgical biopsy be performed in cases of lobular neoplasia diagnosed at stereotactic core needle biopsy to exclude a coexistent intraductal or invasive carcinoma that may be present in 19% of these patients.

Acknowledgments

We thank Myron M. Moskowitz for his thoughtful review of the manuscript.

Footnote

Address correspondence to M. C. Mahoney.

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Information & Authors

Information

Published In

American Journal of Roentgenology
Pages: 949 - 954
PubMed: 16985141

History

Submitted: April 26, 2005
Accepted: July 12, 2005
First published: November 23, 2012

Keywords

  1. biopsy needle
  2. breast cancer
  3. lobular neoplasia
  4. stereotactic vacuum-assisted biopsy

Authors

Affiliations

Mary C. Mahoney
Department of Radiology, University of Cincinnati, 234 Goodman St., M.L. 772, Cincinnati, OH 45267.
Toni M. Robinson-Smith
Department of Pathology, University of Cincinnati, Cincinnati, OH.
Elizabeth A. Shaughnessy
Department of Surgery, University of Cincinnati, Cincinnati, OH.

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