Unit 1527: Histopathology and Cytology

1. Introduction to Histopathology and Cytology

• Definition and scope of histopathology and cytology
• Importance in disease diagnosis and patient management
• Overview of sample types: tissues vs. cells
• Common techniques in sample collection and analysis

2. Cell Structure and Function

• Basic cell anatomy: plasma membrane, cytoplasm, nucleus
• Organelles and their roles: mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes
• Cell types relevant to histopathology and cytology (e.g., epithelial, connective, muscle, nervous cells)
• Cellular processes: proliferation, differentiation, apoptosis
• Cellular changes in disease states

3. Tissue Preparation and Staining Techniques

• Tissue fixation: purpose and common fixatives (e.g., formalin)
• Embedding methods: paraffin embedding and freezing
• Sectioning: microtomy and cryotomy
• Staining techniques:
  • Hematoxylin and eosin (H&E) staining: principles and interpretation
  • Special stains (brief overview): PAS, Masson's trichrome, immunohistochemistry
• Slide mounting and labeling

4. Common Histopathological Findings

• Inflammation: acute vs chronic, cellular infiltrates
• Necrosis: types and morphological features
• Hyperplasia and hypertrophy
• Dysplasia and metaplasia
• Neoplastic changes: benign vs malignant
• Examples of histopathological patterns in common diseases

5. Cytology Techniques

• Sample collection methods:
  • Fine needle aspiration (FNA)
  • Smear preparations
  • Liquid-based cytology
• Preparation and fixation of cytology samples
• Microscopic examination and interpretation of cytological features
• Common cytological findings and their clinical significance

6. Diagnostic Applications of Histopathology and Cytology

• Role in cancer diagnosis and staging
• Identification of infectious agents
• Diagnosis of autoimmune and inflammatory disorders
• Detection of genetic and metabolic diseases
• Case studies illustrating diagnostic workflows

7. Quality Control and Assurance in Histopathology and Cytology

• Importance of quality control in laboratory diagnostics
• Standard operating procedures (SOPs)
• Proficiency testing and external quality assessment
• Laboratory accreditation standards (e.g., ISO 15189)
• Documentation and record-keeping

8. Emerging Trends in Histopathology and Cytology

• Digital pathology: slide scanning and telepathology
• Molecular diagnostics and integration with histopathology
• Artificial intelligence and machine learning applications
• Advances in staining and imaging technologies
• Future directions and research areas