This paper presents a detailed histopathological study of fat-soluble vitamin A deficiency in rats, highlighting the widespread keratinization of epithelial tissues as the primary pathological feature. The study challenges previous assumptions that eye-related changes, such as xerophthalmia and keratomalacia, were the main indicators of vitamin A deficiency. Instead, it emphasizes the involvement of multiple organs, including the respiratory, genitourinary, and salivary systems, with significant atrophy of various glands and epithelial changes. The study describes the development of keratinizing epithelium in several locations, including the respiratory tract, alimentary tract, genitourinary tract, eyes, and ductless glands. The process begins with atrophy of the original epithelium and progresses to the formation of stratified keratinizing epithelium in the ducts and acini of glands. The study also notes the presence of inflammatory changes, but emphasizes that these are secondary to the epithelial changes and not the primary cause of the disease. The study's findings contradict earlier reports that attributed the pathology of vitamin A deficiency primarily to eye changes. It shows that the condition is characterized by widespread keratinization and atrophy of various organs and glands, with the most significant changes occurring in the respiratory and genitourinary tracts. The study also notes that the duration of the deficiency and the composition of the diet are critical factors in the development of the disease. The study's findings have important implications for understanding the pathogenesis of vitamin A deficiency and its effects on various organs and tissues. The results suggest that the condition is not merely a result of eye-related changes but a systemic disorder involving multiple organs and tissues. The study also highlights the importance of proper diet and duration of the deficiency in the development of the disease. The findings contribute to a better understanding of the histopathology of vitamin A deficiency and its effects on various organs and tissues.This paper presents a detailed histopathological study of fat-soluble vitamin A deficiency in rats, highlighting the widespread keratinization of epithelial tissues as the primary pathological feature. The study challenges previous assumptions that eye-related changes, such as xerophthalmia and keratomalacia, were the main indicators of vitamin A deficiency. Instead, it emphasizes the involvement of multiple organs, including the respiratory, genitourinary, and salivary systems, with significant atrophy of various glands and epithelial changes. The study describes the development of keratinizing epithelium in several locations, including the respiratory tract, alimentary tract, genitourinary tract, eyes, and ductless glands. The process begins with atrophy of the original epithelium and progresses to the formation of stratified keratinizing epithelium in the ducts and acini of glands. The study also notes the presence of inflammatory changes, but emphasizes that these are secondary to the epithelial changes and not the primary cause of the disease. The study's findings contradict earlier reports that attributed the pathology of vitamin A deficiency primarily to eye changes. It shows that the condition is characterized by widespread keratinization and atrophy of various organs and glands, with the most significant changes occurring in the respiratory and genitourinary tracts. The study also notes that the duration of the deficiency and the composition of the diet are critical factors in the development of the disease. The study's findings have important implications for understanding the pathogenesis of vitamin A deficiency and its effects on various organs and tissues. The results suggest that the condition is not merely a result of eye-related changes but a systemic disorder involving multiple organs and tissues. The study also highlights the importance of proper diet and duration of the deficiency in the development of the disease. The findings contribute to a better understanding of the histopathology of vitamin A deficiency and its effects on various organs and tissues.