Endocrine System

Adrenal Gland - Fibrosis

    Narrative
    Adrenal gland - Fibrosis in a female F344/N rat from a chronic study. A large focal area of mature fibrous connective tissue (F) replaces parts of the normal cortex (C) and medulla (M); there is also focal mineralization (arrow) and a cluster of pigment-laden macrophages (arrowhead).
    Adrenal gland - Fibrosis in a female F344/N rat from a chronic study. A large focal area of mature fibrous connective tissue (F) replaces parts of the normal cortex (C) and medulla (M); there is also focal mineralization (arrow) and a cluster of pigment-laden macrophages (arrowhead).
    Adrenal gland - Fibrosis in a female F344/N rat from a chronic study (higher magnification of Figure 1). There are scattered fibroblasts and blood vessels within the focus of fibrosis (F); C = cortex, M = medulla.
    Adrenal gland - Fibrosis in a female F344/N rat from a chronic study (higher magnification of Figure 1). There are scattered fibroblasts and blood vessels within the focus of fibrosis (F); C = cortex, M = medulla.
    Adrenal gland, Capsule - Fibrosis in a female F344/N rat from a chronic study. Focal fibrosis (arrow) results in thickening, distortion, and undulation of the adrenal capsule.
    Adrenal gland, Capsule - Fibrosis in a female F344/N rat from a chronic study. Focal fibrosis (arrow) results in thickening, distortion, and undulation of the adrenal capsule.
    Adrenal gland, Capsule - Fibrosis in a female F344/N rat from a chronic study (higher magnification of Figure 3). Fibrosis of the adrenal capsule (arrow) is characterized by mature collagen sheets interspersed with fibrocytes.
    Adrenal gland, Capsule - Fibrosis in a female F344/N rat from a chronic study (higher magnification of Figure 3). Fibrosis of the adrenal capsule (arrow) is characterized by mature collagen sheets interspersed with fibrocytes.
    Adrenal gland, Cortex - Fibrosis in a female Sprague-Dawley rat from a chronic study. Focal fibrosis in the cortex is associated with an organized thrombus (arrow).
    Adrenal gland, Cortex - Fibrosis in a female Sprague-Dawley rat from a chronic study. Focal fibrosis in the cortex is associated with an organized thrombus (arrow).
    Adrenal gland, Cortex - Fibrosis in a female Sprague-Dawley rat from a chronic study (higher magnification of Figure 5). There is residual hemorrhage (arrow) and pigment accumulation (arrowhead) within the focus of fibrosis.
    Adrenal gland, Cortex - Fibrosis in a female Sprague-Dawley rat from a chronic study (higher magnification of Figure 5). There is residual hemorrhage (arrow) and pigment accumulation (arrowhead) within the focus of fibrosis.
    Adrenal gland, Capsule - Fibrosis in a male F344/N rat from a subchronic study. There is focal capsular fibrosis (arrow).
    Adrenal gland, Capsule - Fibrosis in a male F344/N rat from a subchronic study. There is focal capsular fibrosis (arrow).
    Adrenal gland, Capsule - Fibrosis in a female F344/N rat from a chronic study. The capsule is thickened by fibrosis (F), most likely a sequela to the necrosis (Ne) in the adjacent retroperitoneal fat. C = cortex, M = medulla.
    Adrenal gland, Capsule - Fibrosis in a female F344/N rat from a chronic study. The capsule is thickened by fibrosis (F), most likely a sequela to the necrosis (Ne) in the adjacent retroperitoneal fat. C = cortex, M = medulla.

    Authors

    Mark J. Hoenerhoff, DVM, PhD, DACVP
    Associate Professor
    Veterinary Pathologist, In Vivo Animal Core
    Unit for Laboratory Animal Medicine
    University of Michigan
    Ann Arbor, MI

    Georgette D. Hill, D.V.M., Ph.D.
    Toxicologic Pathologist/Assistant Pathology Program Manager
    Comparative Molecular Pathology Division
    Integrated Laboratory Systems, Inc.
    Research Triangle Park, NC

    Margarita M. Gruebbel, DVM, PhD, DACVP
    Senior Pathologist
    Experimental Pathology Laboratories, Inc.
    Research Triangle Park, NC

    Reviewers

    Thomas J. Rosol, DVM, PhD, DACVP
    Professor of Veterinary Biosciences
    Senior Advisor, Life Sciences, Technology Commercialization and Knowledge Transfer
    The Ohio State University
    Columbus, OH

    Gordon Flake, MD
    Staff Scientist
    NTP Pathologist
    Cellular and Molecular Pathology Branch
    National Institute of Environmental Health Sciences
    Research Triangle Park, NC