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1.
Atrophy means reduction in the size of the
head of pancreas - which is seen after any post treated infection, age related , and parenchymal abnormalities.
2.Heterogeneous pancreatic head is description given to the pancreatic parenchyma - saying that its not same echoes as rest of the parenchyma.
3.This suggest there is reduction in size and changes in the parenchymal status two different entities.
4.In this case contrast study would have been beneficial to see the enhancement features.
5.What you have to see now is the
amylase and
lipase levels - if they are normal limits - you need to get a followup
ultrasound or CT as clinically indicated.
Good luck.
Hope i have answered your query,
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