About 75% of<unk> s are sporadic; the remaining 25% are hereditary (and have an increased likelihood of being multiple and of developing at an earlier age). Mutations of the genes for the succinate dehydrogenase, SDHD (previously known as<unk> 1), SDHA, SDHC (previously<unk> 3) and SDHB have been identified as causing familial head and neck<unk> s. Mutations of SDHB play an important role in familial adrenal pheochromocytoma and extra-adrenal<unk>  (of abdomen and thorax), although there is considerable overlap in the types of tumors associated with SDHB and SDHD gene mutations.<unk> s may also occur in MEN type 2A and 2B. Other genes related to familial<unk>  are SDHAF2, VHL, NF1, TMEM127, MAX and SLC25A11.
Paraganglioma
Ganglioglioma
Neurothekeoma
Schwannoma
Glomus tumor
Central neurocytoma
Astrocytoma
Pilocytic astrocytoma