Beyond Skin Deep: Unraveling Breast Neurofibromatosis - A Captivating Case Report

Abstract

Neurofibromatosis type 1 (NF1) is a genetic disorder characterized by the growth of tumors on nerve tissue, known as neurofibromas. Although neurofibromas most commonly affect various parts of the body, their occurrence in the breast is relatively rare. We present a case of a 55yearold female with a known history of NF1 who presented with a palpable mass in her left breast. Imaging studies revealed heterogeneous lesions consistent with neurofibroma. Histopathological examination and surgical excision confirmed the diagnosis. The patient experienced discomfort and aesthetic concerns due to the enlarging mass, prompting surgical intervention. This case highlights the importance of including neurofibromatosis in the differential diagnosis of breast masses in individuals with NF1. Management strategies, including surveillance and surgical excision, are discussed in relation to improving patient outcomes and quality of life.

Full Text

Abstract
Neurofibromatosis type 1 (NF1) is a genetic disorder characterized by the growth of tumors on nerve tissue, known as neurofibromas. Although neurofibromas most commonly affect various parts of the body, their occurrence in the breast is relatively rare. We present a case of a 55yearold female with a known history of NF1 who presented with a palpable mass in her left breast. Imaging studies revealed heterogeneous lesions consistent with neurofibroma. Histopathological examination and surgical excision confirmed the diagnosis. The patient experienced discomfort and aesthetic concerns due to the enlarging mass, prompting surgical intervention. This case highlights the importance of including neurofibromatosis in the differential diagnosis of breast masses in individuals with NF1. Management strategies, including surveillance and surgical excision, are discussed in relation to improving patient outcomes and quality of life.
Keywords: Neurofibromatosis type 1; Breast neurofibromas; Breast tumors; Ultrasound imaging; Surgical excision.

Introduction
Neurofibromatosis type 1 (NF1), also known as von Recklinghausen disease, is a multisystem genetic disorder affecting approximately 1 in 3,000 individuals worldwide. It is characterized by the development of neurofibromas, caféaulait spots, axillary freckling, and Lisch nodules. While neurofibromas typically affect peripheral nerves, their occurrence in the breast is relatively rare [2][6]. Breast involvement in NF1 is underrecognized, and the diagnostic challenge arises from the similarity in imaging features between neurofibromas and other common breast lesions, such as fibroadenomas or phyllodes tumors. Although the majority of breast masses in patients with NF1 are benign, the potential for malignancy, albeit low, makes it imperative to follow a structured diagnostic approach, including histopathological confirmation [9].
This case report explores the clinical course, imaging findings, and management of a breast neurofibroma in a 55yearold female, with emphasis on early detection and effective treatment strategies [4][7].

Case Presentation
Anamnesis
The patient is a 55yearold female with a known history of neurofibromatosis type 1 (NF1), initially diagnosed during childhood due to the presence of caféaulait spots and cutaneous neurofibromas.
[Figure 1. The skin of the abdomen of the patient with many cutaneous neurofibromas.]
She presented to our clinic with a chief complaint of a palpable mass in her left breast, first noticed approximately six months earlier. The mass had gradually increased in size and was associated with occasional discomfort. The patient denied any history of trauma, nipple discharge, or changes in breast contour. She reported regular menstrual cycles and no personal or family history of breast cancer.
On physical examination, a palpable nodule in the upper outer quadrant of the left breast was observed. The overlying skin appeared normal, without signs of inflammation or nipple retraction. Given the patient’s history of NF1 and the clinical presentation, a clinical suspicion of breast neurofibroma was raised. To confirm diagnosis and plan management, imaging studies and histopathological examination were pursued [3][6].

Diagnostic Evaluation
Mammography
Mammography revealed a poorly defined, round mass with variable density, ranging from isodense to slightly hypodense compared to surrounding breast tissue, within dense breast parenchyma. The mass was scarcely visible, and no suspicious microcalcifications or architectural distortions were noted. Bilateral breast tissue appeared symmetrical, with no evidence of focal asymmetry or distortion.

[Figure 2. Mammography images, craniocaudal and mediolateraloblique projections: dense breast tissue and challenging radiological exploration.]

Breast Ultrasound
Ultrasound imaging demonstrated a heterogeneous hypoechoic mass corresponding to the palpable nodule in the left breast. The mass had welldefined margins and lacked posterior acoustic enhancement, suggesting benign etiology. It measured approximately 4 cm. No associated microcalcifications or suspicious features were identified. Color Doppler imaging revealed minimal vascularity, further supporting benign nature [10][6].
[Figure 3. Ultrasound: ovalshaped formation with heterogeneous hypoechogenicity.]

Based on imaging findings, differential diagnoses included fibroadenoma, hamartoma, or neurofibroma. Given the history of NF1 and characteristic appearance of the mass, breast neurofibroma was considered most likely. A biopsy was recommended for definitive diagnosis and to guide management [2][14].

Differential Diagnosis
Differential diagnoses of breast masses in NF1 include:
⦁    Fibroadenoma: common benign tumors with smooth margins; more typical in younger women [7][9].
⦁    Phyllodes Tumor: rare fibroepithelial neoplasms that can mimic fibroadenomas; may grow rapidly; histology ranges benign to malignant [6].
⦁    Hamartoma: benign, mixed tissue lesion; variable echogenicity on ultrasound [9].
⦁    Neurofibroma: benign nerve sheath tumor; in NF1 patients should be strongly considered. Imaging features: hypoechoic on US, variable on mammography [5][6].
⦁    Breast Carcinoma: though uncommon in NF1, must be excluded. Irregular margins, microcalcifications, hypervascularity signal concern [15].
⦁    Other benign lesions: fat necrosis, adenosis, cysts [10][9].

Intervention
After diagnostic workup, the patient underwent surgical excision of the breast mass under general anesthesia. Localization was aided by palpation and imaging. A welldefined mass was excised from the parenchyma of the left breast with clear margins.
Histopathological Examination
Microscopic examination confirmed the diagnosis of breast neurofibroma. Findings included spindle cell proliferation with wavy nuclei, consistent with neurofibroma morphology. Immunohistochemical staining for S100 protein was positive. No atypia or signs of malignant transformation were observed [8][7].

FollowUp and Outcomes
Postoperative recovery was uneventful. The patient’s discomfort resolved, and breast symmetry improved. Clinical examinations were scheduled regularly to monitor for recurrence or new lesions. Imaging followup with annual mammography and breast ultrasound was planned [10][14].
At oneyear followup, the patient was asymptomatic; no recurrent or new breast masses were detected on examination or imaging. The patient expressed satisfaction with cosmetic outcome. Genetic counseling was recommended to assess NF1 transmission risk [6].

Discussion
Neurofibromatosis type 1 (NF1) is a complex hereditary disorder that predominantly affects the nervous system but can manifest in a multitude of tissues and organs, including the breast. Although breast involvement is considered rare, its clinical significance should not be underestimated. Neurofibromas in the breast may present as benign, slow-growing masses; however, they can also lead to discomfort, notable cosmetic deformities, and alterations in breast size and symmetry, which can profoundly affect the patient's psychological well-being and quality of life [4][8].
The imaging characteristics observed in this case—hypoechoic lesions on ultrasound and variable density masses on mammography—are consistent with breast neurofibromas. However, these features are not pathognomonic and overlap with a variety of both benign and malignant breast lesions, such as fibroadenomas, phyllodes tumors, and even carcinoma. This diagnostic challenge highlights the paramount importance of histopathological confirmation to establish an accurate diagnosis and guide appropriate management [6][15].
Surgical excision remains the cornerstone of treatment for symptomatic breast neurofibromas, offering dual benefits: alleviation of physical symptoms and definitive confirmation of benign pathology. Yet, the decision to proceed with surgery must be balanced with considerations of potential scarring and breast deformity, which underscores the need for a personalized, patient-centered approach. Furthermore, vigilant long-term follow-up is crucial due to the risk of lesion recurrence or the development of new neurofibromas, necessitating ongoing clinical and imaging surveillance [10][12].
Given the multisystemic nature of NF1, optimal patient care demands a comprehensive, multidisciplinary team approach involving dermatologists, radiologists, surgeons, oncologists, and geneticists. This collaborative framework facilitates holistic management, addressing not only the physical but also the genetic counseling and psychosocial needs of patients. Despite advances, significant gaps remain in understanding the natural history and long-term outcomes of untreated breast neurofibromatosis, particularly regarding malignant transformation risks, cosmetic sequelae, and impact on quality of life. Future research should focus on these areas, including potential roles for emerging imaging modalities, minimally invasive therapies, and patient-reported outcome measures, to refine clinical protocols and enhance patient care.

Conclusion
This case underscores the critical need to consider breast neurofibroma in the differential diagnosis of breast masses in patients with neurofibromatosis type 1 (NF1), despite its rarity. Awareness of this association can prevent misdiagnosis and delays in appropriate management. Early and accurate diagnosis through a combination of detailed clinical evaluation and advanced imaging techniques is essential to distinguish neurofibromas from other benign or malignant breast lesions. Definitive surgical excision not only alleviates symptoms and addresses cosmetic concerns but also provides histopathological confirmation, which is indispensable for guiding further care.
Moreover, this case highlights the importance of consistent, long-term monitoring, as neurofibromas may recur or new lesions may develop over time, necessitating vigilant surveillance to ensure timely intervention. A multidisciplinary team approach—integrating expertise from dermatology, radiology, surgery, oncology, and genetics—is paramount to deliver comprehensive, patient-centered care that addresses both the physical manifestations and the broader genetic and psychosocial implications of NF1.
By enhancing clinical suspicion and fostering collaboration across specialties, healthcare providers can improve diagnostic accuracy, optimize treatment strategies, and ultimately, enhance the quality of life for patients living with this complex disorder.