Table 1.

Fluorescence in situ hybridization studies in extraventricular neurocytomas. Abbreviation: NA = not applicable.

Case	1p/1q ratio	19q/19p ratio	1p	19q	1CEP‐19p12 % fusion	t(1;19) (>60% fused signals)	1p19q distribution
1	0.55	0.57	Deletion	Deletion	84	Present	Same areas
2	0.61	0.59	Deletion	Deletion	71	Present	Same areas
3	0.68	0.72	Deletion	Deletion	76	Present	Same areas
4	0.55	0.57	Relative deletion*	Relative deletion	75	Present	Same areas
5	0.66	0.66	Relative deletion	Deletion	24	Absent	Different areas†
6	0.69	0.93	Deletion	Aneusomy	38	Absent	NA
7	0.79	0.96	Relative deletion	Normal	41	Absent	NA
7	1.00	0.88	Aneusomy	Aneusomy	33	Absent	NA
9	1.01	0.96	Aneusomy	Aneusomy	24	Absent	NA
10	0.96	1.01	Normal	Normal	53	Absent	NA
11	0.88	1.06	Aneusomy	Aneusomy	15	Absent	NA
12	0.98	0.96	Normal	Normal	11	Absent	NA
13	1.00	0.98	Normal	Normal	11	Absent	NA
14	0.95	1.00	Normal	Normal	11	Absent	NA
15	0.96	0.99	Aneusomy	Normal	15	Absent	NA
16	0.98	0.98	Normal	Normal	—	Failed	NA
17	0.93	0.96	Normal	Normal	—	Failed	NA
18	0.95	1.01	Normal	Aneusomy	—	Failed	NA
19	0.98	1.02	Aneusomy	Aneusomy	33	Absent	NA
20	0.98	0.98	Normal	Normal	—	Failed	NA
21	1.03	Failed	Normal	—	—	Failed	NA

^* Relative deletion: region of interest/control probe count ratio <0.8 associated with aneusomy.

^† Different areas: 1p loss present in tumor areas with intact 19q and vice versa.