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Metastatic papillary carcinoma of thyroid masquerading as a renal tumour
  1. R Gupta1,
  2. S Viswanathan1,
  3. A D’Cruz2,
  4. S V Kane2
  1. 1
    Department of Pathology, Head and Neck Services, Tata Memorial Hospital, Mumbai 400012, India
  2. 2
    Department of Surgery, Head and Neck Services, Tata Memorial Hospital, Mumbai 400012, India
  1. Dr Seethalakshmi Viswanathan, Associate Professor and Assistant Pathologist, 8th Floor, Annexe Building, Tata Memorial Hospital, Dr E Borges Rd, Parel, Mumbai 400012, India; vishyvidya{at}hotmail.com

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Differentiated papillary carcinomas constitute 80–90% of thyroid malignancies and are known for regional nodal metastasis.1 Only 2% of patients present with haematogenous metastases involving lungs, brain and bone.2

A man in his 50s presented elsewhere with flank pain and haematuria. Computed tomography scan revealed a 5 cm cystic, necrotic mass in the upper pole of the right kidney. Following a right radical nephrectomy for a primary renal malignancy the patient was referred to our institute.

Gross examination of a kidney measuring 8.5×5×5 cm revealed a 5×5×4 cm mass, with gelatinous brown areas, adherent to the renal capsule in the …

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