Pathology Notes

Skin tumors and melanocytic lesions Updated: 02/17/20 © Jun Wang, MD, PhD Origination Epidermis Adnexa Soft tissue Others Epidermal disorders Benign non proliferative melanocytic disorders Acanthosis nigricans   Benign tumors Seborrheic keratosis Acrochordon Lentigo Melanocytic nevus Malignant tumors Basal cell carcinoma Squamous cell carcinoma Merkel cell carcinoma Melanoma Sweat gland tumors Poroma Cylindroma Syringoma Hair follicle/sebaceous gland tumors Epidermal cyst Pilar cyst Sebaceous adenoma Pilomatricoma Trichoepithelioma Trichilemmoma Soft tissue tumors Dermatofibroma Dermatofibrosarcoma protuberans Neurofibroma Schwannoma Hematopoietic neoplasm Mycosis fungoides Practice questions I Practice questions II Practice questions III Back to skin pathology Back to contents

Pathology of exocrine pancreas and gallbladder Updated: 03/14/19 © Jun Wang, MD, PhD Key anatomy and histological features Head, body and tail  Exocrine pancreas: Majority of pancreatic tissue, glandular epithelial cells Predominantly at the head Drain through pancreatic duct Acini, ducts Endocrine pancreas: Islets, pale endocrine cells Alpha: secrete glucagon (20% 0f cells) Beta: insulin (70% of cells) Delta: somatostatin (5% of cells) PP cells: pancreatic polypeptide Non neoplastic disorders Acute pancreatitis Chronic pancreatitis Autoimmune pancreatitis Cysts Cystic neoplasm Serous cystic neoplasm Mucinous cystic neoplasm Intraductal papillary mucinous neoplasm Solid-pseudopapillary neoplasm Non cystic neoplasm Pancreatic cancers Gallbladder disorders Acute cholecystitis Chronic cholecystitis Cholelithiasis Malignant tumor of gallbladder Practice questions Back to gastrointestinal tract pathology Back to conte

Pathology of skin 03/13/2018 © Jun Wang, MD, PhD Skin Epidermis Keratinocytes Melanocytes Meckel cell Langerhans cell Dermis: collagens Adnexa Hair follicle Sweat gland Sebaceous gland Inflammatory dermatosis Vesiculobullous diseases Papulosquamous diseases Acute inflammatory dermatosis Neoplasms Benign and low grade malignant skin tumors Malignant non melanocytic skin tumors  Melanocytic lesions Back to contents

Pathology of Gastrointestinal Tract Updated: 01/25/2024 © Jun Wang, MD, PhD Anatomy and histology Squamous cell lining: oral cavity, esophagus Columnar epithelium without goblet cells: stomach Columnar epithelium with goblet cells With villi: small intestine With villi: colon, including appendix Lymphoid tissue: Peyer’s patch Glands: liver, gallbladder, pancreas, salivary glands Pathology of GI tract Congenital disorders  Infectious gastroenteritis Oral cavity Esophagus Stomach Intestinal tumors Salivary glands Exocrine pancreas and gallbladder Back to contents