TABLE 2 Summary of Pathologic and Molecular Data of Present and Previously Reported Cases

Case No.	Site	Morphology	EM	Immunohistochemistry with “positive results”^a						Molecular Studies
				CD99	vimentin	NSE	Synapto	NF	S100
Frontal	Blue cell tumor	−	+	+	NA	−	−	+	−
	CPA recurrence	Blue cell tumor	Yes	+	+	NA	−	−	+	t (11;22)
2	Frontal	Blue cell tumor	−	+	+	NA	+	+	−	22q12 rearrang
3^b	Frontal	Blue cell tumor	−	+	+	+	−	+	NA	−
	Frontal recurrence	Blue cell tumor	−	+	+	+	−	+	NA	−
	7th rib metastasis	Blue cell tumor	−	+	+	+	−	+	NA	t (11;22)
4^c	Frontal	With rosettes	−	+	−	−	−	−	−	−
5^d	Frontal	Blue cell tumor		+	+	+	−	NA	NA	t (11;22)

NA, not available; EM, electron microscopy; RT-PCR, reverse transcription polymerase chain reaction; FISH, fluorescence in situ hybridization; rearrang.
^aCytokeratin, CD45, GFAP, EMA, desmin, actin, myoglobin, and chromogranin were also performed in some of the cases, with negative results.
^bPapotti et al. (15).
^cKatayama et al. (14).
^dAntunes et al. (16).

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