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Case Reports
. 2024 Mar:116:109397.
doi: 10.1016/j.ijscr.2024.109397. Epub 2024 Feb 16.

Invasive breast carcinoma with ipsilateral axillary squamous carcinoma of unknown primary: A case report

Deshan Gomez  1 , Sanjeewa Seneviratne  2
Affiliations
Case Reports

Invasive breast carcinoma with ipsilateral axillary squamous carcinoma of unknown primary: A case report

Deshan Gomez et al. Int J Surg Case Rep. 2024 Mar.

Abstract

Introduction & importance: Invasive ductal carcinoma is the commonest primary breast carcinoma to metastasize to the axillary nodes. Squamous carcinoma (SCC) of the breast is seen rarely as a primary breast malignancy. Breast SCC with coexistent invasive ductal/lobular carcinoma as a 'collision tumour' is rare.

Case presentation: A 52-year-old Sri Lankan female presented with a right sided breast lump and ipsilateral cystic axillary mass. She was diagnosed with locally advanced invasive breast carcinoma and underwent neoadjuvant chemotherapy followed by mastectomy and axillary clearance where tumour infiltration of the brachial plexus was observed. Histology revealed two separate carcinomas; an invasive carcinoma of the breast and squamous carcinoma in the axilla. A squamous primary was not found despite evaluation. The patient developed recurrent axillary ulceration due to residual tumour and was transferred for oncological care.

Clinical discussion: This patient had a biopsy-proven invasive breast carcinoma with a cystic axillary mass with lymphadenopathy. This was concluded as locally advanced breast cancer. Pathological examination of the specimen indicated the presence of two separate malignancies of the breast and axilla. No evidence of squamous metaplasia or carcinoma of the breast was seen on histology, neither was a squamous primary identified on imaging or endoscopy. Neoadjuvant therapy may have caused resolution of the squamous component.

Conclusion: The presence of two separate cancers of varied histology in the breast and ipsilateral axilla in close proximity to each other is a rare phenomenon. Clinicians must be cautious not to misinterpret it as evidence of lymphatic spread.

Keywords: Breast cancer; Case report; Collision tumour; Squamous cell carcinoma; Two cancers.

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Conflict of interest statement

Declaration of competing interest The author(s) declare(s) that there is no conflict of interest.

Figures

Fig. 1
Fig. 1
Initial presentation with clinically malignant breast lump and cystic axillary mass.
Fig. 2
Fig. 2
Post NACT residual invasive carcinoma of the breast NST with high grade DCIS and perineural invasion.
Fig. 3
Fig. 3
H&E of the axillary mass showing keratinizing squamous cell carcinoma with skin ulceration and focal involvement of the resection margins.
See this image and copyright information in PMC

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