The definitive diagnostic method for distinguishing acute cellular rejection from other causes of graft dysfunction in a transplanted organ is a biopsy of the transplanted organ, followed by expert histological examination. A biopsy involves obtaining a small tissue sample from the transplanted organ, typically using a needle guided by imaging such as ultrasound or CT scan. Histological examination refers to the process where this obtained tissue is meticulously prepared, stained with specific dyes, and then examined under a microscope by a specialized pathologist. This allows for direct visualization of the cellular and structural changes within the organ.
Acute cellular rejection (ACR) is an immune response where the recipient's T-lymphocytes, a type of white blood cell, directly recognize and attack the donor organ's cells, leading to inflammation and damage within the graft. On microscopic examinati....
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