It is a Prospective descriptive hospital based clinical study to determine the value of introduction of endoscope after microscopic excision of cerebello-pontine angle lesions to estimate the following :

1. Intraoperative judgement of lesions excision, residual parts, visualization and operative corridor pre and after endoscope introduction.
2. Post-operative tumor control confirmed comparison between pre and postoperative MRI.
3. Postoperative complications, advantages and disadvantages compared with these when use pure microscopic excision from the literature

Inclusion Criteria: cerebellopontine angle lesions

• meningeoma.
• vestibular schwannoma.
• arachnoid cyst.
• petroclival meningeoma.

Exclusion Criteria:

• trigeminal neuralgia.
• facial neuralgia.