Mention the detection and diagnosis of Cancer.

(N/A) Early detection of cancers is essential as it allows the disease to be treated successfully in many cases.
Cancer detection is based on biopsy and histopathological studies of the tissue,and blood and bone marrow tests for increased cell counts in the case of leukemias.
In biopsy,a piece of suspected tissue is cut into thin sections,stained,and examined under a microscope by a pathologist.
Techniques like radiography (use of $X$-rays),Computed Tomography $(CT)$,and Magnetic Resonance Imaging $(MRI)$ are very useful to detect cancers of internal organs.
Computed tomography uses $X$-rays to generate a three-dimensional image of the internals of an object.
$MRI$ uses strong magnetic fields and non-ionizing radiations to accurately detect pathological and physiological changes in living tissues.