Invasive Lobular Carcinoma With Extracellular Mucin: Not All Mucinous Mammary Carcinomas Are Ductal!

International Journal of Surgical Pathology
Kamaljeet SinghKatrine Hansen

Abstract

Mucinous component in mammary carcinoma indicates ductal phenotype. Although intracytoplasmic mucin and signet ring cell change are frequently described with lobular carcinomas, extracellular mucin is not associated with lobular phenotype. We report 4 cases of invasive lobular carcinoma with extracellular mucin (ILCEM) and review findings of previously published cases of this rare ILC variant. Variable amount of extracellular mucin and pseudoglandular architectural pattern may lead to diagnosis of ILCEM as ductal mucinous carcinoma. Pathologists should be aware of this rare variant of ILC that will help identify more cases of this entity and clarify relevance of extracellular mucin production in ILC.

References

Dec 19, 2012·Breast Cancer Research and Treatment·Purevsuren JambalBritta M Jacobsen
Jun 18, 2016·International Journal of Surgery Case Reports·G S Gómez MacíasI García Hernández

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Citations

May 19, 2020·The Breast Journal·Paula S GinterSandra J Shin
Dec 8, 2020·Breast Cancer : Basic and Clinical Research·Matthew J BurkyBenjamin C Calhoun
Jun 25, 2021·Diagnostic Cytopathology·Alwalid Freih-FraihJosé A Jiménez-Heffernan

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