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Acute monocytic leukemia in an irradiated Beagle
Veterinary Pathology
|March 1, 1979
Summary
A dog exposed to radiation developed a myeloproliferative disorder, specifically monocytic leukemia, years later. This involved abnormal blood cell counts and widespread tumor cell infiltration.
Area of Science:
- Veterinary Pathology
- Radiation Oncology
- Hematology
Background:
- Chronic radiation exposure can lead to long-term health effects.
- Myeloproliferative disorders are a group of cancers affecting blood-forming tissues.
- Canine models are valuable for understanding radiation-induced diseases.
Purpose of the Study:
- To document the long-term hematologic and pathologic consequences of protracted gamma irradiation in a dog.
- To characterize the specific type of myeloproliferative disorder that developed post-irradiation.
- To confirm the monocytic origin of the neoplastic cells.
Main Methods:
- Hematologic analysis of peripheral blood and bone marrow.
- Histopathological examination of tissues obtained at necropsy.
- Cytochemical, ultrastructural, and in vitro cell culture studies to confirm cell lineage.
Main Results:
- Hematologic changes consistent with a myeloproliferative disorder, including anemia, thrombocytosis, and immature granulocytes/monocytes.
- A period of partial remission followed by a terminal crisis with marked leukocytosis (monocytes/promonocytes).
- Necropsy revealed infiltration of multiple organs (spleen, liver, lymph nodes, etc.) by neoplastic cells with monocytic differentiation.
Conclusions:
- Protracted gamma irradiation can induce a myeloproliferative disorder resembling monocytic leukemia in dogs.
- The neoplastic cells exhibited characteristics of monocytes and their precursors.
- This case highlights the potential for delayed oncogenesis following radiation exposure.
