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Oral Pathology - 11 - Salivary Gland Malignant Diseases

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Oral Pathology

Introduction to Oral Pathology1

Oral pathology is the specialty of dentistry and discipline of pathology that addresses the nature, identification, and management of diseases affecting the oral and maxillofacial regions. It is a science that investigates the causes, processes, and effects of these diseases.

Clinical Manifestations and Diagnosis

The practice of oral pathology involves the clinical examination, radiographic interpretation, and microscopic analysis of tissues to reach a definitive diagnosis. Key areas of focus include:

  • Developmental Anomalies: Structural defects occurring during the formation of oral tissues.
  • Infectious Diseases: Bacterial, viral, and fungal infections manifesting in the oral cavity.
  • Neoplasms: Benign and malignant tumors of the soft tissues and jawbones.
  • Immune-Mediated Disorders: Conditions where the immune system affects the mucosal lining.

Role of the Pathologist

The oral pathologist serves as a consultant to dental and medical practitioners, providing critical diagnostic information that guides patient treatment and management strategies. This includes the correlation of clinical findings with histopathological features to ensure accurate disease classification.

Clinical Classifications and Disease Categories2

  • Developmental Conditions
  • Mucosal Lesions—Reactive
  • Mucosal Lesions—Infections
  • Mucosal Lesions—Immunologic Diseases
  • Mucosal Lesions—Premalignant
  • Mucosal Lesions—Malignant
  • CT Tumors—Benign
  • CT Tumors—Malignant
  • Salivary Gland Diseases—Reactive
  • Salivary Gland Diseases—Benign
  • Salivary Gland Diseases—Malignant
  • Lymphoid Neoplasms
  • Odontogenic Cysts
  • Odontogenic Tumors
  • Bone Lesions—Fibro-Osseous
  • Bone Lesions—Giant Cell
  • Bone Lesions—Inflammatory
  • Bone Lesions—Malignant
  • Hereditary Conditions

Salivary Gland Malignancies

Location

Malignant salivary gland diseases are most common on the palate, whereas benign tumors are often found in the parotid gland.

Clinical Presentation3

The intraoral view of the lower jaw reveals a prominent, reddish-pink, lobulated mass located on the posterior mandibular alveolar mucosa, adjacent to the premolars and molars.

  • Malignant salivary gland diseases consistently present most frequently on the palate.
  • Clinical appearances can be very similar across different types of salivary malignancies.

Mucoepidermoid Carcinoma

Key Characteristics

  • Most common salivary gland malignancy
  • Composed of mucous and epithelial cells

Polymorphous Low-Grade Adenocarcinoma4

  • Second most common salivary gland malignancy for minor glands
  • “Adeno-” is a prefix referring to a gland
  • Commonly presents on the palate.

Adenoid Cystic Carcinoma

  • Characterized by a cribriform or "Swiss cheese" microscopic pattern, appearing as empty spaces "chewed out" of the tissue sample.
  • This malignancy can also affect breast tissue, where it exhibits the same histological Swiss cheese/cribriform pattern.
  • This is a lethal disease with a significant drop in long-term survival rates:
    • 5-year survival: 70%
    • 15-year survival: 10%

Footnotes

  1. Original PDF page 1: Oral Pathology - 11 - Salivary Gland Malignant Diseases, p.1 ↩

  2. Original PDF page 2: Oral Pathology - 11 - Salivary Gland Malignant Diseases, p.2 ↩

  3. Original PDF page 3: Oral Pathology - 11 - Salivary Gland Malignant Diseases, p.3 ↩

  4. Original PDF page 4: Oral Pathology - 11 - Salivary Gland Malignant Diseases, p.4 ↩

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