{'fraction_non_alphanumeric': 0.023133543638275498, 'fraction_numerical': 0.011566771819137749, 'mean_word_length': 4.666666666666667, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
The Fourth Ventricle Epidermoid Cyst: About Two Cases

Epidermoid cysts are rare benign tumors developed from ectodermic inclusions. They usually sit at the ponto-cerebellar angle, the para-sellar region and the temporal fossa. Their seat at the fourth ventricle is unusual. We report two cases of squamous cell cyst in two young patients aged 21 and 33 admitted for intracranial hypertension syndrome associated with walking disorders. The diagnosis of epidermoid cyst of the V4 was evoked on the data of the MRI then confirmed in peroperative and in histology. The surgical excision was subtotal due to adhesion of the capsule to the upper part of the V4 floor. After a 12-month follow-up, the first patient showed no signs of tumor re-evolution. The second patient benefited from a ventriculo-peritonial derivation 45 days after the cyst was removed. After a 7-month follow-up, the patient showed no clinical signs suggestive of tumor re-evolution.