Symptom Information: Sort according to HPO 

1
(HPO:0002251) Aganglionic megacolon Very frequent [Orphanet] 78 / 7739
2
(HPO:0001250) Seizures Occasional [Orphanet] 1245 / 7739
3
(HPO:0001252) Muscular hypotonia Occasional [Orphanet] 990 / 7739
4
(HPO:0002093) Respiratory insufficiency Very frequent [Orphanet] 410 / 7739
5
(HPO:0100006) Neoplasm of the central nervous system Occasional [Orphanet] 34 / 7739
6
(HPO:0000153) Abnormality of the mouth 60 / 7739
7
(HPO:0000358) Posteriorly rotated ears 163 / 7739
8
(HPO:0000369) Low-set ears 372 / 7739
9
(HPO:0000494) Downslanted palpebral fissures 328 / 7739
10
(HPO:0000975) Hyperhidrosis 64 / 7739
11
(HPO:0001626) Abnormality of the cardiovascular system 73 / 7739
12
(HPO:0002019) Constipation 194 / 7739
13
(HPO:0002791) Hypoventilation 10 / 7739
14
(HPO:0003005) Ganglioneuroma 6 / 7739
15
(HPO:0003006) Neuroblastoma 16 / 7739
16
(HPO:0004370) Abnormality of temperature regulation 58 / 7739
17
(HPO:0006747) Ganglioneuroblastoma 5 / 7739
18
(HPO:0011968) Feeding difficulties 240 / 7739
19
(OMIM) Diminished pupillary light responses 2 / 7739
20
(OMIM) Shallow breathing 3 / 7739
21
(OMIM) Normal respiratory rate 2 / 7739
22
(OMIM) Periods of apnea 2 / 7739
23
(OMIM) Abnormal respiration due to defect in autonomic function 2 / 7739
24
(OMIM) Decreased sensitivity to hypercapnia and hypoxemia 2 / 7739
25
(OMIM) Dysfunction of the autonomic nervous system 2 / 7739
26
(OMIM) Decreased basal body temperature 2 / 7739
27
(OMIM) Tumors of the sympathetic nervous system (5 to 10%) 2 / 7739
28
(OMIM) Chronic hypoxemia 2 / 7739
29
(OMIM) Chronic hypercapnia 2 / 7739
30
(HPO:0012758) Neurodevelopmental delay Occasional [Orphanet] 949 / 7739
31
(HPO:0011420) Death Frequent [Orphanet] 184 / 7739
32
(HPO:0000006) Autosomal dominant inheritance 2518 / 7739
33
(HPO:0007110) Central hypoventilation 6 / 7739