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MR imaging of intrasellar meningiomas simulating pituitary adenomas
1Department of Diagnostic Radiology, Evanston Hospital, McGaw Medical Center of Northwestern University, IL 60201.
Abstract:
Over 3 1/2 years, 401 magnetic resonance studies were performed for suspected sellar-parasellar masses. Twenty-nine pituitary macroadenomas and 12 meningiomas were detected. Among the meningiomas there were three whose MR appearance simulated that of a pituitary tumor. In none of these cases was the diaphragma sellae visualized. Furthermore, in one case the prolactin level was elevated. A preoperative diagnosis of pituitary tumor resulted in an inappropriate surgical approach being used initially for its removal (transsphenoidal). Thus, nonvisualization of the diaphragma sellae and elevated prolactin levels do not exclude a nonpituitary origin of a sellar-parasellar tumor. Other methods for preoperative differentiation are discussed.
Insights
Magnetic resonance imaging (MRI) can misdiagnose sellar-parasellar tumors. Nonvisualization of the diaphragma sellae and elevated prolactin levels do not rule out non-pituitary tumors, impacting surgical approach.
Area of Science:
- Neurology
- Radiology
- Neurosurgery
Background:
- Sellar-parasellar masses are frequently evaluated using magnetic resonance (MR) imaging.
- Distinguishing between pituitary adenomas and other tumors like meningiomas is crucial for appropriate treatment.
Observation:
- Of 401 MR studies for suspected sellar-parasellar masses, 29 pituitary macroadenomas and 12 meningiomas were identified.
- Three meningiomas exhibited MR appearances mimicking pituitary tumors.
- The diaphragma sellae was not visualized in these three atypical meningioma cases.
Findings:
- Nonvisualization of the diaphragma sellae on MR imaging does not exclude a non-pituitary origin for sellar masses.
- Elevated prolactin levels, often associated with pituitary tumors, can also occur in non-pituitary sellar masses.
- Misdiagnosis led to an inappropriate initial transsphenoidal surgical approach in one case.
Implications:
- Relying solely on MR imaging features like diaphragma sellae visualization and prolactin levels can lead to diagnostic errors.
- Preoperative differentiation of sellar-parasellar tumors requires consideration of multiple imaging findings and clinical data.
- Accurate preoperative diagnosis is essential to guide the correct surgical strategy and improve patient outcomes.