What question did this study set out to answer?

This report aims to highlight the detection of contralateral invasive lobular carcinoma using MRI and elastography in a patient with past invasive ductal carcinoma.

March 29, 2026Ankara Üniversitesi Tıp Fakültesi Mecmuası0 citationsOpen Access

Contralateral Invasive Lobular Carcinoma Mimicking an Intramammary Lymph Node: A Case Report of MRI Detection and Elastography Differentiation in a Patient with Prior IDC

EBEmre Utkan BüyükceranGüven Hospital ASAyça SeyfettinGüven Hospital ABAndelib BabatürkGüven Hospital

Key Points

This report aims to highlight the detection of contralateral invasive lobular carcinoma using MRI and elastography in a patient with past invasive ductal carcinoma.
Conducted screening MRI to identify new lesions.
Utilized ultrasound to assess the lesion's characteristics.
Applied shear-wave elastography to evaluate tissue stiffness.
Performed core biopsy to confirm diagnosis.
MRI detected a new lesion that appeared similar to a benign lymph node.
Elastography indicated high stiffness values, suggesting malignancy.
Core biopsy confirmed the lesion as invasive lobular carcinoma.

Abstract

We report a rare case of contralateral invasive lobular carcinoma (ILC) diagnosed three years after initial treatment for invasive ductal carcinoma (IDC). The new lesion, detected incidentally on screening MRI, mimicked an intramammary lymph node on MRI and ultrasound due to its well-circumscribed appearance and hilar-like echogenicity. Shear-wave elastography revealed high stiffness values, raising suspicion for malignancy. Core biopsy confirmed ILC. This case underscores the critical role of MRI in detecting clinically occult cancers and highlights elastography’s potential to unmask malignancies mimicking benign structures.

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