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[Metastasis in the inner auditory canal].
G G Ferri1, G C Modugno, A Fioravanti
1Dipartimento di Scienze Chirurgiche ed Anestesiologiche, Università di Bologna.
Summary
Metastasis to the pontocerebellar angle (PCA) is rare. Rapid hearing loss and facial paralysis in the inner auditory canal (IAC) may indicate malignancy, not just acoustic neurinoma (AN).
Area of Science:
- Neurology
- Oncology
- Radiology
Background:
- Expansive pathologies in the pontocerebellar angle (PCA) are predominantly benign, such as acoustic neurinoma (AN) and meningioma.
- Metastatic disease to the inner auditory canal (IAC) or PCA is exceptionally rare.
Observation:
- A case of sudden hearing loss and rapid facial nerve paralysis in the right ear is presented.
- Cerebral MRI with gadolinium suggested an AN-compatible neoformation in the IAC.
- Post-operative histology revealed adenocarcinoma, with the primary tumor identified in the right lung.
Findings:
- Rapidly progressing hearing loss and facial nerve palsy in the PCA can be indicative of malignancy.
- Radiological features of PCA malignancies can mimic those of benign tumors like AN, complicating pre-operative diagnosis.
- Histological examination post-surgery is crucial for definitive diagnosis of rare metastatic lesions in the PCA.
Implications:
- Clinicians should maintain a high index of suspicion for malignancy in cases of sudden, rapid onset neurological deficits in the PCA.
- Distinguishing between benign and malignant lesions in the PCA pre-operatively can be challenging due to similar imaging characteristics.
- This case underscores the importance of thorough histopathological analysis for accurate diagnosis and management of PCA pathologies.