Indian Journal of Pathology and Microbiology
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CASE REPORT
Year : 2023  |  Volume : 66  |  Issue : 1  |  Page : 180-183

Atrophic kidney-like lesion: A rare benign entity and mimicker of thyroid follicular-like carcinoma of kidney


Department of Pathology, Artemis Hospitals, Sector - 34, Gurugram, Haryana, India

Correspondence Address:
Deepa Goel
Artemis Hospitals, Sector - 34, Gurugram, Haryana
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/IJPM.IJPM_1107_21

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Atrophic kidney like lesion (AKLL) is a recently described benign entity with only 14 cases reported so far. Genitourinary Pathology Society proposed inclusion of AKLL as a provisional entity in 2021. It mimics thyroid follicular-like carcinoma of kidney as it has a follicular architecture. We report a case of an 18-year-old female with detection of renal mass, while the patient was being investigated for abdominal pain. Mediastinal nodes were also enlarged with detection of necrotizing granulomas on biopsy. Histology revealed a tumor enveloped by a thick capsule with smooth muscle fibers, varying sized follicles, interspersed atrophic tubules, and calcifications. Immunohistochemically, the “cystic follicles” show WT1 +/PAX8 -/CK7-phenotype, while atrophic tubules present between “cystic follicles” harbor WT1 -/PAX8 +/CK7 + phenotype. Morphological diagnosis and differential diagnosis will be discussed.


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