Home Imaging manifestations of ductal adenoma of the breast: A case report
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Imaging manifestations of ductal adenoma of the breast: A case report

  • Yaning Zhu , Haitong Yu , Zhaolong Zheng , Zewen Liu , Qin Li and Xiqing Wu EMAIL logo
Published/Copyright: July 16, 2024

Abstract

Tubular adenomas of the breast are rare benign epithelium-derived tumours, and so few cases have been reported. Most often, the tumours are palpable, well-circumscribed masses in women of childbearing age and are commonly diagnosed as fibroadenomas both clinically and radiographically. We describe the case of a premenopausal patient with tubular adenoma of the breast who presented with small nipple discharge and a palpable breast mass. On imaging, tubular adenomas are practically indistinguishable from fibroadenomas and most commonly present as oval, circumscribed masses that are hypoechoic on ultrasound. On magnetic resonance imaging (MRI), tubular adenomas may present as lobulated or oval masses with a hyperintense signal on T2-weighted imaging and inhomogeneous internal enhancement on dynamic contrast-enhanced MRI. Pathologic findings after resection of the mass confirmed the diagnosis of tubular adenoma.

1 Background

Tubular adenoma of the breast is a clinically rare, benign epithelium-derived tumour that accounts for approximately 0.13–1.70% of benign breast tumours [1]. Typically, tubular adenomas occur in young women of childbearing age and rarely occur before menarche or after menopause [2]. The classical histological characteristic of tubular adenoma is the proliferation of packed tubular structures within a small amount of fibrous stroma. Tubular adenomas present clinically painless, palpable nodules [3]. The final diagnosis of tubular adenoma of the breast requires histopathological analysis [1]. Due to its low incidence, most of the reports in the literature describe only clinicopathological features. There are few reports on the usefulness of radiologic and pathologic methods for identifying tubular adenoma. Breast ultrasound is an important means of screening and diagnosing breast diseases [4]. Magnetic resonance imaging (MRI) has a high resolution and can provide a large amount of detailed anatomical and histologic information. Radiologists and clinicians often have a poor understanding of tubular adenoma, which is easily misdiagnosed as fibroadenoma before surgery [5]. Both ultrasound and MRI provide a reliable basis for the diagnosis of benign lesions.

In this study, the imaging, pathological, and clinical data of a patient with tubular adenoma confirmed by surgery and pathology at our hospital were retrospectively analysed to improve the ability of imaging doctors to recognize breast tubular adenoma images as well as the preoperative diagnosis rate.

2 Case presentation

A 43-year-old female was found to have a painless mass in her left breast 2 years prior that was not treated. Specialist examination revealed that the appearance of both breasts was normal, lacking an orange peel appearance or the dimple sign. The left nipple was accompanied by a small amount of discharge. A mass of approximately 20 mm × 20 mm was palpable in the upper quadrant of the left inner mammary gland. Ultrasound revealed a glandular layer in the left outer lower breast quadrant and a nodular hypoechoic lesion 2.1 cm × 1.4 cm in size with a clear boundary and lobed shape. Colour Doppler ultrasound revealed a blood flow signal in the lesion. The breast imaging reporting and data system classification was 4b (Figure 1a and b).

Figure 1 
               Ultrasound exam of her left breast revealed oval, parallel, circumscribed, hypoechoic masses (arrows) with internal vascularity (a and b).
Figure 1

Ultrasound exam of her left breast revealed oval, parallel, circumscribed, hypoechoic masses (arrows) with internal vascularity (a and b).

The patient underwent contrast-enhanced breast MRI, which revealed a lobulated mass in the left breast, presenting with a hypointense signal on T1-weighted imaging (Figure 2a) and a hyperintense signal on T2-weighted imaging (Figure 2b). The lesion showed an elevated signal with a high apparent diffusion coefficient (1.41 × 10−3 mm2/s) on diffusion-weighted imaging (Figure 2c and d). Dynamic contrast-enhanced MRI revealed that the mass had inhomogeneous enhancement (Figure 2e). The time signal intensity curves revealed a washout pattern for the mass (Figure 2f). The patient underwent mass resection. Macroscopically, the tumour, measuring 2.1 cm × 1.6 cm × 1.1 cm, presented as a solid white elastic nodule with a smooth surface resembling a fibroadenoma. Histological examination of the mass indicated a tubular breast adenoma. The section was greyish-yellow and had an average texture. The lesion was rounded and nodular, surrounded by dense, proliferating glandular ducts with typical epithelial and myoepithelial cell layers (Figure 3a and b).

Figure 2 
               MRI of lesions of the left breast (arrows). (a) Lesions with Low signal intensity on T1-weighted images. (b) High signal intensity on T2-weighted images. (c and d) High apparent diffusion coefficient value. (e and f) Dynamic contrast-enhanced imaging with time signal intensity curves for washout pattern.
Figure 2

MRI of lesions of the left breast (arrows). (a) Lesions with Low signal intensity on T1-weighted images. (b) High signal intensity on T2-weighted images. (c and d) High apparent diffusion coefficient value. (e and f) Dynamic contrast-enhanced imaging with time signal intensity curves for washout pattern.

Figure 3 
               Tubular adenoma (a and b). Hematoxylin and eosin of core needle biopsy shows a lesion with well-defined borders consisting of small, lined by a basal layer of myoepithelial cells (arrow) and overlying glandular epithelium (arrowhead). There is minimal intertubular fibrous tissue.
Figure 3

Tubular adenoma (a and b). Hematoxylin and eosin of core needle biopsy shows a lesion with well-defined borders consisting of small, lined by a basal layer of myoepithelial cells (arrow) and overlying glandular epithelium (arrowhead). There is minimal intertubular fibrous tissue.

  1. Informed consent: Informed consent has been obtained from all individuals included in this study.

  2. Ethical approval: The research related to human use has been complied with all the relevant national regulations, institutional policies and in accordance with the tenets of the Helsinki Declaration, and has been approved by the authors’ institutional review board or equivalent committee.

3 Discussion

Tubular adenomas are rare benign tumours of the breast that are often found in young women. Typical clinical manifestations include a palpable, painless mass with clear boundaries, good manoeuvrability, soft texture, and no changes in the surrounding skin or nipples, and the axillary lymph nodes are generally not swollen. Tubular adenomas almost always occur in the normal location of breast tissue, but it has also been reported to occur in accessory breast tissues [6]. Histologically, tubular adenoma is composed of a circumscribed mass of tightly packed tubules surrounded by minimal stroma. The tubules are lined by one layer of epithelial cells and a thin layer of myoepithelial cells [7]. Unlike fibroadenomas, which contain a large amount of fibrous stroma, there is scant stroma surrounding the packed acinar cells [8].

Tubular adenomas and fibroadenomas of the breast have similar clinical presentations and imaging features, and identifying their pathologic types based on imaging is challenging [1]. Ultrasound is the most common breast exam for young women. It has been reported that tubular adenomas of the breast usually appear on ultrasound as well-defined hypoechoic masses with long axes parallel to the skin [9]. MRI is advantageous as it can be performed in multiparametric mode, which can provide more differential diagnostic information. In this case, the patient’s MRI showed an oval shape with a lobulated appearance, clear borders, and an inhomogeneous signal from the mass on enhanced imaging. A rare case of a giant cystic tubular adenoma of the breast was previously reported in which an uneven, internal signal on T1- and T2-weighted images reflected secretory products and proteins that were histologically trapped in the tubular adenoma [10]. It has been suggested that the rich ductal component of tubular adenomas may be the pathologic basis for their heterogeneous signals [8]. The lobulated appearance may be related to the fact that tubular adenomas contain a large proportion of epithelial cells, which are softer in texture, and as the tumour continues to grow, the fibrous tissue septum divides it into multiple nodules [11]. Fibroadenomas have more mesenchymal components, which are harder and less likely to form a lobulated structure. This may be one of the points of differentiation between tubular adenomas and fibroadenomas. Lobular tumours and lactating adenomas may also be elliptical with a lobulated morphology, but lobular tumours are often associated with a fissure-like low signal within the tumour and rapid enlargement of the mass in a short period, allowing them to be differentiated by careful examination [12]. Lactating adenomas are usually associated with pregnancy, breastfeeding, or a history of oral contraceptive use, which may provide a basis for differentiation [13].

Calcifications may be a sign of benign changes, but they can also be a product of malignant processes. In this case, no microcalcifications within the lesion were detected on ultrasound or MRI. A previous study reported tubular adenomas in young women who did not show calcifications during mammography and whose appearance was similar to that of noncalcified fibroadenomas, whereas in older patients, tightly packed punctate or irregular calcifications may be observed [1]. This may be related to the older age of the patients, the longer growth time of the lesion, the blood circulation disorder of the tumour, and the calcium salt deposition that occurs after tissue necrosis [11]. The calcification foci of tubular adenomas usually have certain characteristics, such as a dense, punctate, or irregular shape, and the calcification distribution is dense relative to the lesion volume [5]. Microscopically, these large, round clumps of calcium and phosphorus are located within the dilated acinar glands [8]. The distribution and morphology of malignant calcifications in the breast are usually different from those of tubular adenomas, which are usually characterized by finer particles, larger numbers, and wider distributions [14]. The different characteristics of intralesional calcification can help in distinguishing tubular adenoma from breast cancer. However, more attention should be paid to calcifications because they may be a precursor of malignant processes from a radiological perspective. Currently, biopsy of these lesions is still necessary to exclude a malignant process.

Tubular adenoma of the breast is a disease distinct from fibroadenomas and fibroepithelial lesions, making it necessary to describe its cytologic features. The presence of tubules and stromal debris has been found to be an independent factor associated with tubular adenomas in comparison with fibroadenomas, while the predominance of large epithelial debris and bare stromal debris are independently associated with fibroadenomas. These findings not only reflect the histologic differences between tubular adenomas and fibroadenomas but also confirm that tubular adenomas have cytologically distinguishable features from fibroadenomas and that tubular adenomas can be diagnosed by fine-needle aspiration cytology [15]. Mammary ductal adenomas are pathologically benign tumours that rarely recur. However, some scholars have found that this benign lesion can evolve into intraductal carcinoma in situ if it persists for a long time [14], so we believe that it should be taken seriously. Therefore, observing the details of the margins, morphology, and internal signal and the degree of uniformity of enhancement of the mass, combined with the patient’s history, is conducive to differential diagnosis.

4 Conclusion

Tubular adenoma of the breast occurs in young women of childbearing age and is a rare benign epithelial lesion. Preoperative diagnosis is difficult because, in most cases, the clinical manifestations and imaging features resemble fibroadenomas. In this case, the internal heterogeneous signals of the mass and the oval shape of the lobulated mass were related to the pathological changes in the tubular adenoma and can play a role in the differential diagnosis of tubular adenoma, helping to improve the preoperative diagnosis rate.


# Yaning Zhu, Haitong Yu and Zhaolong Zheng contributed equally to this study.

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Acknowledgements

The authors would like to acknowledge the hard and dedicated work of all the staff that implemented the intervention and evaluation components of the study.

  1. Funding information: This study has received funding from the Natural Science Foundation of Shandong Province (ZR202103060229).

  2. Author contributions: Y.Z. and H.T. contributed to this project development and manuscript editing. Y.Z., Z.Z., and Z.L. contributed to data collection and manuscript associated editing. Y.Z. and Q.L. contributed to data analysis. Z.Z. and H.T. contributed to manuscript editing. Y.Z., H.T., and X.W. contributed to project development and manuscript editing. All authors contributed to the article and approved the submitted version.

  3. Conflict of interest: Authors state no conflict of interest.

  4. Data availability statement: The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Received: 2024-02-26
Revised: 2024-04-23
Accepted: 2024-06-11
Published Online: 2024-07-16

© 2024 the author(s), published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 International License.

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  154. Reexamination of Aspergillus cristatus phylogeny in dark tea: Characteristics of the mitochondrial genome
  155. Differences in the flavonoid composition of the leaves, fruits, and branches of mulberry are distinguished based on a plant metabolomics approach
  156. Investigating the impact of wet rendering (solventless method) on PUFA-rich oil from catfish (Clarias magur) viscera
  157. Non-linear associations between cardiovascular metabolic indices and metabolic-associated fatty liver disease: A cross-sectional study in the US population (2017–2020)
  158. Knockdown of USP7 alleviates atherosclerosis in ApoE-deficient mice by regulating EZH2 expression
  159. Utility of dairy microbiome as a tool for authentication and traceability
  160. Agriculture
  161. Enhancing faba bean (Vicia faba L.) productivity through establishing the area-specific fertilizer rate recommendation in southwest Ethiopia
  162. Impact of novel herbicide based on synthetic auxins and ALS inhibitor on weed control
  163. Perspectives of pteridophytes microbiome for bioremediation in agricultural applications
  164. Fertilizer application parameters for drip-irrigated peanut based on the fertilizer effect function established from a “3414” field trial
  165. Improving the productivity and profitability of maize (Zea mays L.) using optimum blended inorganic fertilization
  166. Application of leaf multispectral analyzer in comparison to hyperspectral device to assess the diversity of spectral reflectance indices in wheat genotypes
  167. Animal Sciences
  168. Knockdown of ANP32E inhibits colorectal cancer cell growth and glycolysis by regulating the AKT/mTOR pathway
  169. Development of a detection chip for major pathogenic drug-resistant genes and drug targets in bovine respiratory system diseases
  170. Exploration of the genetic influence of MYOT and MB genes on the plumage coloration of Muscovy ducks
  171. Transcriptome analysis of adipose tissue in grazing cattle: Identifying key regulators of fat metabolism
  172. Comparison of nutritional value of the wild and cultivated spiny loaches at three growth stages
  173. Transcriptomic analysis of liver immune response in Chinese spiny frog (Quasipaa spinosa) infected with Proteus mirabilis
  174. Disruption of BCAA degradation is a critical characteristic of diabetic cardiomyopathy revealed by integrated transcriptome and metabolome analysis
  175. Plant Sciences
  176. Effect of long-term in-row branch covering on soil microorganisms in pear orchards
  177. Photosynthetic physiological characteristics, growth performance, and element concentrations reveal the calcicole–calcifuge behaviors of three Camellia species
  178. Transcriptome analysis reveals the mechanism of NaHCO3 promoting tobacco leaf maturation
  179. Bioinformatics, expression analysis, and functional verification of allene oxide synthase gene HvnAOS1 and HvnAOS2 in qingke
  180. Water, nitrogen, and phosphorus coupling improves gray jujube fruit quality and yield
  181. Improving grape fruit quality through soil conditioner: Insights from RNA-seq analysis of Cabernet Sauvignon roots
  182. Role of Embinin in the reabsorption of nucleus pulposus in lumbar disc herniation: Promotion of nucleus pulposus neovascularization and apoptosis of nucleus pulposus cells
  183. Revealing the effects of amino acid, organic acid, and phytohormones on the germination of tomato seeds under salinity stress
  184. Combined effects of nitrogen fertilizer and biochar on the growth, yield, and quality of pepper
  185. Comprehensive phytochemical and toxicological analysis of Chenopodium ambrosioides (L.) fractions
  186. Impact of “3414” fertilization on the yield and quality of greenhouse tomatoes
  187. Exploring the coupling mode of water and fertilizer for improving growth, fruit quality, and yield of the pear in the arid region
  188. Metagenomic analysis of endophytic bacteria in seed potato (Solanum tuberosum)
  189. Antibacterial, antifungal, and phytochemical properties of Salsola kali ethanolic extract
  190. Exploring the hepatoprotective properties of citronellol: In vitro and in silico studies on ethanol-induced damage in HepG2 cells
  191. Enhanced osmotic dehydration of watermelon rind using honey–sucrose solutions: A study on pre-treatment efficacy and mass transfer kinetics
  192. Effects of exogenous 2,4-epibrassinolide on photosynthetic traits of 53 cowpea varieties under NaCl stress
  193. Comparative transcriptome analysis of maize (Zea mays L.) seedlings in response to copper stress
  194. An optimization method for measuring the stomata in cassava (Manihot esculenta Crantz) under multiple abiotic stresses
  195. Fosinopril inhibits Ang II-induced VSMC proliferation, phenotype transformation, migration, and oxidative stress through the TGF-β1/Smad signaling pathway
  196. Antioxidant and antimicrobial activities of Salsola imbricata methanolic extract and its phytochemical characterization
  197. Bioengineering and Biotechnology
  198. Absorbable calcium and phosphorus bioactive membranes promote bone marrow mesenchymal stem cells osteogenic differentiation for bone regeneration
  199. New advances in protein engineering for industrial applications: Key takeaways
  200. An overview of the production and use of Bacillus thuringiensis toxin
  201. Research progress of nanoparticles in diagnosis and treatment of hepatocellular carcinoma
  202. Bioelectrochemical biosensors for water quality assessment and wastewater monitoring
  203. PEI/MMNs@LNA-542 nanoparticles alleviate ICU-acquired weakness through targeted autophagy inhibition and mitochondrial protection
  204. Unleashing of cytotoxic effects of thymoquinone-bovine serum albumin nanoparticles on A549 lung cancer cells
  205. Erratum
  206. Erratum to “Investigating the association between dietary patterns and glycemic control among children and adolescents with T1DM”
  207. Erratum to “Activation of hypermethylated P2RY1 mitigates gastric cancer by promoting apoptosis and inhibiting proliferation”
  208. Retraction
  209. Retraction to “MiR-223-3p regulates cell viability, migration, invasion, and apoptosis of non-small cell lung cancer cells by targeting RHOB”
  210. Retraction to “A data mining technique for detecting malignant mesothelioma cancer using multiple regression analysis”
  211. Special Issue on Advances in Neurodegenerative Disease Research and Treatment
  212. Transplantation of human neural stem cell prevents symptomatic motor behavior disability in a rat model of Parkinson’s disease
  213. Special Issue on Multi-omics
  214. Inflammasome complex genes with clinical relevance suggest potential as therapeutic targets for anti-tumor drugs in clear cell renal cell carcinoma
  215. Gastroesophageal varices in primary biliary cholangitis with anti-centromere antibody positivity: Early onset?
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