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Radiological Investigation II: MRI and Ventilation Perfusion Scan01:30

Radiological Investigation II: MRI and Ventilation Perfusion Scan

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Description
Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
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Performance of Routine MRI Reporting for Parapharyngeal Space Tumors: A Retrospective Radiologic-Pathologic

Mohammed Alshahrani1, Mohammed Almayouf1, Aseel Doubi2

  • 1Department of Otolaryngology-Head and Neck Surgery, King Fahad Medical City, Riyadh 11525, Saudi Arabia.

Journal of Clinical Medicine
|January 10, 2026
PubMed
Summary

Magnetic resonance imaging (MRI) shows high specificity for benign parapharyngeal space tumors but limited sensitivity for malignancy. Real-world diagnostic accuracy requires cautious interpretation due to the low prevalence of malignant cases.

Keywords:
diagnostic imaginghead and neck neoplasmsmagnetic resonance imagingparapharyngeal spaceretrospective study

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Area of Science:

  • Radiology
  • Oncology
  • Anatomy

Background:

  • The parapharyngeal space contains vital neurovascular structures and is a rare site for tumors (0.5-1% of head and neck neoplasms).
  • Magnetic resonance imaging (MRI) is crucial for preoperative assessment of these tumors.
  • The diagnostic accuracy of MRI in real-world clinical settings for parapharyngeal tumors is not well-established.

Purpose of the Study:

  • To evaluate the diagnostic accuracy of MRI for parapharyngeal tumors.
  • To assess the performance of MRI in distinguishing benign from malignant parapharyngeal lesions.
  • To compare MRI findings with histopathological diagnoses at two tertiary centers.

Main Methods:

  • Retrospective analysis of 31 patients who underwent MRI and surgical excision between 2018 and 2024.
  • Independent review of MRI data by two reviewers.
  • Comparison of MRI findings with definitive pathological data.

Main Results:

  • Most tumors (90.3%) were benign, with neurogenic and salivary tumors being most common.
  • MRI showed moderate overall agreement (κ = 0.525) but excellent agreement for schwannomas and paragangliomas.
  • MRI demonstrated high specificity (92.9%) for malignancy detection but limited sensitivity (66.7%) and positive predictive value (50.0%), influenced by a small number of malignant cases (n=3).

Conclusions:

  • MRI exhibits high specificity for identifying benign parapharyngeal space lesions in clinical practice.
  • Radiologic-pathologic agreement is strong for benign lesions.
  • The diagnostic performance for malignancy requires cautious interpretation due to the limited sample size of malignant cases.