Sinonasal SMARCB1 (INI1) Deficient Carcinoma With Yolk Sac Tumor Differentiation: Report of a Case and Comparison With INI1 Expression in Gonadal Germ Cell Tumors
SMARCB1 (INI1) deficient sinonasal carcinoma is a recently recognized entity with wide histomorphologic spectrum. We present a case of this carcinoma that contained, in addition to a common morphology, scattered foci of yolk sac tumor differentiation. The tumor occurred in paranasal sinuses in a 44-year-old woman. Immunohistochemically, it was diffusely negative for INI1, whereas an expression of yolk sac tumor markers (-fetoprotein, glypican-3, CDX2) was limited to the yolk sac tumor component. For comparison with the present case, we performed INI1 immunostaining on a series of 11 gonadal germ cell tumors with yolk sac tumor differentiation. All of these cases showed strong and diffuse expression of INI1, in contrast with the present sinonasal tumor. Our findings expand the morphologic spectrum of SMARCB1 (INI1) deficient sinonasal carcinoma. In addition, we show preliminarily that gonadal germ cell tumors with yolk sac tumor differentiation are not SMARCB1/INI1-deficient.
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Kyushu Univ, Grad Sch Med Sci, Dept Anat Pathol, Higashi Ku, Fukuoka 8128582, JapanKyushu Univ, Grad Sch Med Sci, Dept Anat Pathol, Higashi Ku, Fukuoka 8128582, Japan
Kohashi, Kenichi
Oda, Yoshinao
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Kyushu Univ, Grad Sch Med Sci, Dept Anat Pathol, Higashi Ku, Fukuoka 8128582, JapanKyushu Univ, Grad Sch Med Sci, Dept Anat Pathol, Higashi Ku, Fukuoka 8128582, Japan
Oda, Yoshinao
Yamamoto, Hidetaka
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Kyushu Univ, Grad Sch Med Sci, Dept Anat Pathol, Higashi Ku, Fukuoka 8128582, JapanKyushu Univ, Grad Sch Med Sci, Dept Anat Pathol, Higashi Ku, Fukuoka 8128582, Japan
Yamamoto, Hidetaka
Tamiya, Sadafumi
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Kyushu Univ, Grad Sch Med Sci, Dept Anat Pathol, Higashi Ku, Fukuoka 8128582, JapanKyushu Univ, Grad Sch Med Sci, Dept Anat Pathol, Higashi Ku, Fukuoka 8128582, Japan
Tamiya, Sadafumi
Matono, Hiroshi
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Kyushu Univ, Grad Sch Med Sci, Dept Anat Pathol, Higashi Ku, Fukuoka 8128582, JapanKyushu Univ, Grad Sch Med Sci, Dept Anat Pathol, Higashi Ku, Fukuoka 8128582, Japan
Matono, Hiroshi
Iwamoto, Yukihide
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Kyushu Univ, Grad Sch Med Sci, Dept Orthopaed Surg, Higashi Ku, Fukuoka 8128582, JapanKyushu Univ, Grad Sch Med Sci, Dept Anat Pathol, Higashi Ku, Fukuoka 8128582, Japan
Iwamoto, Yukihide
Taguchi, Tomoaki
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Kyushu Univ, Grad Sch Med Sci, Dept Pediat Surg, Higashi Ku, Fukuoka 8128582, JapanKyushu Univ, Grad Sch Med Sci, Dept Anat Pathol, Higashi Ku, Fukuoka 8128582, Japan
Taguchi, Tomoaki
Tsuneyoshi, Masazumi
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Fukuoka Sanno Hosp, Dept Pathol, Sawara Ku, Fukuoka, JapanKyushu Univ, Grad Sch Med Sci, Dept Anat Pathol, Higashi Ku, Fukuoka 8128582, Japan