What might occur to an animal with an untreated lesion on its brain stem?

The one that might occur if the animal had a prolonged period of untreated lesion on its brain stem is potential of undetected brain tumor.
It is highly recommended for per owners to immediately do an MRI if you notice a weird bump on your pet's head.

Urban growth invariably feeds increased commercialization and industrialization. it requires continually expanding land areas. when urbanization rates are high, and countries do not have the institutional and managerial capacities or economic wherewithal to manage such rapid growths, they exert intense pressure on the types and nature of the resulting settlements. they contribute to the development of overcrowded slums and shanty towns without adequate essential services and necessary infrastructure.-by asit k. biswas and cecilia tortajada