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Asynchronous pituitary adenomas with differing morphology
E Thodou1, G Kontogeorgos, E Horvath
1Department of Pathology, Mount Sinai Hospital, Toronto, Ontario, Canada.
Archives of Pathology & Laboratory Medicine
|August 1, 1995
Summary
Recurrent pituitary tumors can be challenging. A case suggests that apparent tumor recurrence may actually be two distinct, new pituitary adenomas developing asynchronously.
Area of Science:
- Neuro-oncology
- Endocrinology
- Pathology
Background:
- Recurrent pituitary tumors present diagnostic and therapeutic challenges.
- Pituitary adenomas can cause symptoms like headaches and visual impairment.
- Endocrinologic abnormalities are not always present.
Observation:
- A 43-year-old man presented with a pituitary mass causing headaches and visual impairment.
- Initial surgery revealed a silent corticotroph adenoma.
- Thirteen years later, a new pituitary mass appeared with different characteristics.
Findings:
- The initial tumor was a silent corticotroph adenoma, subtype 2.
- The later tumor showed ultrastructural and immunocytochemical features of an oncocytoma.
- Morphological differences suggest two separate, de novo pituitary adenomas.
Implications:
- Pituitary tumor recurrence may represent metachronous development of distinct adenomas.
- This challenges traditional views of tumor recurrence.
- Further research is needed to understand the mechanisms of asynchronous adenoma formation.