Synovialosarcoma is a malignant mesenchymal tumor of young adults that occurs in the deep soft tissues, particularly around large joints. When it occurs in more unusual sites, it could present a significant diagnostic challenge. In this case, a 19-year-old girl was treated for a pyloric mass. A pyelic urine cytology performed simultaneously with a pyloric biopsy proved to be a significant element of orientation and perfectly concordant with the histopathological aspect of the pyelic mass after nephrectomy. We report here the first case of renal synovialosarcoma documented in pyelic urine.
Keywords: Cell block; Cellules rhabdoïdes; Cytobloc; Cytologie; Cytology; Primary renal synovial sarcoma; Pyelic urine; Renal sarcoma; SS18-SSX; Sarcome rénal; Synovialosarcome rénal primitif; Urines pyéliques; rhabdoid cells.
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