SQUAMOUS CELL CARCINOMA WITH A RHABDOID PHENOTYPE AFFECTING THE MAXILLA: CASE REPORT AND IMMUNOHISTOCHEMICAL ANALYSIS

• Published in: Oral surgery, oral medicine, oral pathology and oral radiology oral medicine, oral pathology and oral radiology, 2020-01, Vol.129 (1), p.e83-e84
• Main Authors: TEIXEIRA, LUCAS RIBEIRO, NONAKA, CASSIANO FRANCISCO WEEGE, ALVES, POLLIANNA MUNIZ, GORDON-NÚÑEZ, MANUEL ANTONIO, SILVA, RODRIGO NEVES, POLANCO, XIOMARA BEATRIZ JIMENEZ, LEÓN, JORGE ESQUICHE
• Format: Article
• Language: English
• ISSN: 2212-4403; 2212-4411
• DOI: 10.1016/j.oooo.2019.06.341

Squamous cell carcinoma (SCC) with a rhabdoid phenotype (SCCRP) is an extremely rare entity in the maxillofacial region. To date, only 2 oral SCCRP cases have been reported. The presence of this phenotype is associated with a worse prognosis than conventional SCC. A 44-year-old man was referred presenting painful facial asymmetry evidenced by increase of volume in the left maxilla with several months of evolution. Computerized tomography examination showed extensive osteolytic lesion on the left maxilla and maxillary sinus. The histopathologic analysis showed typical morphologic features of SCCRP constituted by polygonal and discohesive cells with large hyaline cytoplasmic inclusions and eccentric nuclei with single prominent nucleoli. Immunohistochemistry revealed positivity for CK AE1/AE3, epithelial membrane antigen (EMA), vimentin, CD138, INI-1, focally for α–smooth muscle actin, and CD68. Ki-67 was > 40%. Although rare, SCCRP should be considered in the differential diagnosis when assessing malignant neoplasms affecting the maxilla. FAPESP (2016/11419-0 and 2017/02502-4).