The subject of the Teaching Course organized by the French Society of Neuro
surgery during its Winter meeting in 1998 was phacomatosis. Special interes
t was given to the Von Hippel-Lindau (VHL) disease. Guidelines for the mana
gement of this disease are the following:
The diagnosis is established in the presence of two major lesions, or with
one major lesion associated with a familial history, or when a VHL gene mut
ation is detected.
An isolated hemangioblastoma (HBM) is associated with the disease in 36 % o
f the cases when located in the posterior fossa and in 64 % of the cases wh
en located in the spinal cord.
The main causes of mortality of VHL are the following : HEM (61 %), renal c
ancer (31 %) and pheochromocytoma (PCC) (8 %).
The percentage of PCC in the French series is 24 %.
The percentage of Endolymphatic tumor in the French series is 4 %.
No surgery is recommended in case of asymptomatic HEM (but radiosurgery has
to be evaluated).
Follow-up requires regular clinical examinations, one ophthalmological exam
ination per year, one abdominal ultrasonography per year, and one cerebral
MRI every three years.