Morphologic diagnosis is the interpretation of the lesion.
In the case of non-neoplastic lesions, it consists of:
- Lesion: inflammation (nephritis, dermatitis, etc.), or other types of processes: necrosis, infarction, edema, atrophy...
- Distribution: focal, focally extensive, multifocal, multifocal to coalescent, diffuse.
- Course: acute, acute, subacute, chronic.
- Severity: mild, moderate and severe.
Other questions that may arise after diagnosis include:
- Infectious or parasitic, name of agent.
- Genetic: name of gene affected.
- Nutritional: type of deficiency or excess, etc.
- Disease name: name by which a particular disease is known. E.g.: chronic granulomatous enteritis is known as Paratuberculosis or Johne's disease.
In the case of neoplastic lesions:
- Type of neoplasm:
- Epithelial: adenoma/papilloma or carcinoma/adenocarcinoma.
- Mesenchymal or round cell: -oma or -sarcoma. E.g. fibrosarcoma.
- Muscular: -oma or -sarcoma. E.g. leiomyoma.
- Invasion or not, lymphatic or vascular and metastasis to other organs.