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Signet-ring squamous cell carcinoma of the pyriform sinus.
Klijanienko J, Micheau C, Ponzio-Prion A, Azli N. Klijanienko J, et al. Among authors: ponzio prion a. Am J Clin Pathol. 1990 Apr;93(4):592-3. doi: 10.1093/ajcp/93.4.592. Am J Clin Pathol. 1990. PMID: 2321593 No abstract available.