The Role of Preoperative CT Scans in Staging External Auditory Meatus Carcinoma: Radiologic-Pathologic Correlation Study

Abstract

Survival is related to the pathologic extent of tumor in external auditory meatus (EAM) carcinoma. This study assesses the validity of preoperative CT scans in staging EAM carcinoma. The accuracy of staging EAM carcinoma with preoperative CT scans was evaluated by comparing radiography and histopathology. Patients who received preoperative CT scan were selected from a retrospective series of 35 temporal bone resections for EAM squamous cell carcinoma. The CT scans were systematically reviewed for tumor involvement in 12 anatomic areas. The histopathology slides for the corresponding patients were reviewed according to the same criteria. CT scan findings accurately diagnosed the extent of tumor involvement identified during histopathologic examination. These tumors demonstrated the capacity to spread along existing anatomic pathways as well as direct bone erosion. We conclude that preoperative CT scans accurately stage EAM squamous cell carcinoma.

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References

Lewis

. Cancer of the ear. CA 1987; 37: 78–86.

Arriaga

Hirsch

Kamerer

Myers

. Squamous carcinoma of the external auditory meatus. Otolaryngol Head Neck Surg 1989; 101: 330–7.

Crabtree

Pierce

. Carcinoma of the external auditory canal. Laryngosocpe 1976; 86: 405–15.

Conley

Schuler

. Malignancies of the ear. Laryngoscope 1976; 86: 1147–63.

American Joint Committee on Cancer. Manual for staging of cancer. Philadelphia: JB Lippincott, 1988: 11.

Arriaga

Curtin

Hirsch

Takahashi

Kamerer

. Staging proposal for external auditory meatus carcinoma based on preoperative clinical examination and computed tomography findings. Ann Otol Rhinol Laryngol 1990; 99: 714–21.