Analysis of the Volumes of the Posterior Cranial Fossa, Cerebellum, and Herniated Tonsils Using the Stereological Methods in Patients with Chiari Type I Malformation

Table 1

An example of the application of volume and the volume fraction method described in the present study. 𝑃(𝑌) = number of points hitting the cross section of the cerebellum. 𝑃(𝑋) = number of points hitting the cross section of the herniated tonsil.

Section number	𝑃(𝑌)	𝑃(𝑋)	𝑃(𝑌)×𝑃(𝑋)	∑𝑃(𝑌)^2	∑𝑃(𝑋)^2
1	2	0	0	4	0
2	6	7	42	36	49
3	13	9	117	169	81
4	20	19	380	400	361
5	21	16	336	441	256
6	24	15	360	576	225
7	30	14	420	900	196
8	29	16	464	841	256
9	29	13	377	841	169
10	23	12	276	529	144
11	21	11	231	441	121
12	27	10	270	729	100
13	26	11	286	676	121
14	22	9	198	484	81
15	20	6	120	400	36
16	20	3	60	400	9
17	17	1	17	289	1
18	10	1	10	100	1
19	7	0	0	49	0
20	6	0	0	36	0
21	2	0	0	4	0
Total	375	173	3964	8345	2207