Abstract
Intercalated duct lesions (IDLs) are usually asymptomatic. We report a case of IDL, in which a palpable mass formed. The patient was a 45-year-old Japanese male, who noticed a mass in the left parotid region. The nodular lesion was well-circumscribed, but did not have a fibrous capsule or exhibit infiltrative growth. It contained a small cystic space and consisted of basaloid cells arranged in a cribriform pattern and inner ductal cells. It had some solid areas of nest-like proliferation displaying mild cellular atypia. Immunohistochemically, the luminal cells were positive for cytokeratin (CK)7 and epithelial membrane antigen, and the abluminal cells were positive for CK5/6, p63, and DOG1. S-100 protein-positive stromal cells were also seen. The lesion’s cells were all positive for SOX10, and the nuclei of some basaloid cells were positive for β-catenin. The Ki-67 labeling index was 3.8%. The ductal cells contained diastase-digestion-resistant, Periodic acid Schiff-positive zymogen granules. Genetically, the lesion harbored a missense mutation in the CTNNB1 gene. We diagnosed the lesion as an IDL. As IDLs are usually small non-neoplastic lesions, symptomatic cases are rare. Based on its common immunohistochemical and genetic features, IDL may be a precursor of basal cell adenoma/adenocarcinoma, such as intercalated duct adenoma.
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Abbreviations
- IDL:
-
Intercalated duct lesion
- CK:
-
Cytokeratin
- ADP/H:
-
Adenomatous ductal proliferation/hyperplasia
- IDH:
-
Intercalated duct hyperplasia
- BCA:
-
Basal cell adenoma
- BCAC:
-
Basal cell adenocarcinoma
- EMC:
-
Epithelial-myoepithelial carcinoma
- D-PAS:
-
Diastase-digested, Periodic acid Schiff
- FFPE:
-
Formalin-fixed, paraffin-embedded
- EMA:
-
Epithelial membrane antigen
- ASMA:
-
Alpha-smooth muscle actin
- PLAG1:
-
Pleomorphic adenoma gene 1
- SOX10:
-
SRY-related HMG-box 10
- DOG1:
-
Discovered of GIST 1
- PCR:
-
Polymerase chain reaction
- IDA:
-
Intercalated duct adenoma
- LEF-1:
-
Lymphoid enhancer-binding factor 1
- H & E:
-
Hematoxylin and eosin
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Acknowledgements
The authors thank Mr. Naofumi Ishikawa; Ms. Yoko Yamazaki; Ms. Chinatsu Tsuchiya; Mr. Kensuke Shimazaki; Ms. Aki Kubota; Mr. Koji Takahashi; Ms. Nobuyo Tsujino; Mr. Yohei Saguchi; Mr. Jun-ichi Sakano; and the medical staff at the Department of Pathology, Shizuoka General Hospital, Shizuoka, Japan, for the technical assistance they provided. We are also grateful to Ms. Mamiko Uemura, Ms. Tomo Terao, and Ms. Misato Iwama, doctors’ assistants at the Department of Pathology, Shizuoka General Hospital, Shizuoka, Japan, for their help with the preparation of the manuscript.
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This study was supported in part by a Grant-in-Aid from the Medical Research Support Project of Shizuoka Prefectural Hospital Organization in 2021 (to KK).
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KK designed and drafted the manuscript, and KK, AM, AM, KA, and MS made the histopathological diagnoses and analyzed the immunohistochemical results. KH performed the excellent immunohistochemistry. SB performed the molecular analysis using PCR-based direct sequencing. MS supervised the manuscript. All of the authors have read and approved the final manuscript.
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This study was approved by the institutional review board of Shizuoka General Hospital (SGHIRB#2019007). All subjects signed informed consent forms before participating.
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Kusafuka, K., Baba, S., Kitani, Y. et al. A symptomatic intercalated duct lesion of the parotid gland: a case report with immunohistochemical and genetic analyses. Med Mol Morphol 55, 329–336 (2022). https://doi.org/10.1007/s00795-022-00328-7
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DOI: https://doi.org/10.1007/s00795-022-00328-7