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Primitive neuroectodermal tumor of the stomach.
Raoulin Soulard1, Valère Claude, Philippe Camparo
1Laboratoire d'Anatomie Pathologique, Hôpital d'Instruction des Armées du Val-de Grâce, Paris, France. cellule_suspecte@yahoo.fr <cellule_suspecte@yahoo.fr>
Archives of Pathology & Laboratory Medicine
|January 5, 2005
Summary
This study reports the first known case of primitive neuroectodermal tumor originating in the stomach. This rare visceral tumor was successfully surgically removed from a 66-year-old woman.
Area of Science:
- Oncology
- Pathology
- Genetics
Background:
- Ewing sarcoma/primitive neuroectodermal tumor (PNET) typically affects bone and soft tissues in younger individuals.
- Recent findings indicate that PNET can also arise from visceral organs, expanding its known clinicopathologic spectrum.
- The visceral origin of PNET is an area of growing research interest.
Observation:
- A case of PNET was identified in the stomach of a 66-year-old female patient.
- The tumor presented as solid nests and sheets of round cells microscopically.
- Immunohistochemical analysis revealed CD99, S100, neuron-specific enolase, and vimentin expression.
Findings:
- The gastric PNET exhibited characteristic immunoreactivity for CD99, S100, neuron-specific enolase, and vimentin.
- Genetic analysis confirmed the presence of an EWS-ERG fusion, a hallmark of Ewing sarcoma family tumors.
- The neoplasm was completely excised via a radical surgical procedure.
Implications:
- This case represents the first documented instance of a primitive neuroectodermal tumor arising in the stomach.
- The findings contribute to the understanding of rare PNET presentations and their visceral origins.
- Highlights the importance of considering PNET in the differential diagnosis of gastric tumors, particularly in older adults.