Pathology dictionary for patients


July 14, 2022


Our patient-friendly pathology dictionary provides definitions for the most common terms and phrases used by pathologists in pathology reports. These definitions describe general concepts. Go here if you would like more information about your diagnosis. Contact us if you have a question about any of the definitions in the dictionary.

A B C D E F G H I J K L M N O P R S T U V W X Y Z

A

Abscess
Acanthosis
Acute inflammation
Addendum
Adenoma
Adenocarcinoma
Adenomyosis
Adenosquamous carcinoma
Adipose tissue
Adrenal gland
Anaplastic
Anemia
Antibody
Apocrine
Apoptosis
Arteriovenous malformation (AVM)
Atrophic
Atrophy
Atypia
Atypical
Atypical mitotic figure
Atypical mitosis​

B

B cells
Ballooning hepatocyte
Basal lymphoplasmacytosis
Basaloid neoplasm
Benign
Benign neoplasm
Biopsy
Breast cancer
Breslow thickness

C

Calcification
Carcinoma
Carcinoma in situ
Carcinoid
Cautery artifact
CD20
CD3
CD30
CD34
CD5
CD68
CDX-2
Cholesterol cleft
Cribriform
Chronic inflammation
Chromatin
Colon
Colon cancer
Colonic mucosa
Crohn’s disease
Crypt abscess
Crypt distortion
Cryptitis
Cytokeratin
Cytokeratin 5 (CK5)
Cytokeratin 7 (CK7)
Cytokeratin 20 (CK20)
Cyst
Cytoplasm

D

Desmin
Desmoplasia
DIF
Differentiated
Diffuse
Direct immunofluorescence
Distal
Duct
Dysplasia

E

Edema
Endophytic
Eosinophil
Epithelial cell
Epithelium
Epstein-Barr virus (EBV)
Epstein-Barr virus-encoded small RNAs (EBER)
Estrogen receptor (ER)
Erosion
Excision
Exophytic
Extranodal extension (ENE)

F

Fibrosis
Fine needle aspiration biopsy (FNAB)
FISH
Flow
Fluorescence in situ hybridization
Foamy histiocyte
Focal
Foveolar metaplasia
Frozen section
Fuhrman grade​

G

GATA-3
Gallbladder
Gastric heterotopia
Gland
Grade
Granular cell tumour
Granulation tissue
Granuloma
Grocott (GMS)
Gross
Gross description

H

Hamartoma
Helicobacter pylori
H. pylori
Hematoxylin and eosin (H&E)
Hematopoietic cells
Heterogeneous
Her2
High-grade squamous intraepithelial lesion (HSIL)
Homogeneous
Human papillomavirus (HPV)
Hurthle cell
Hyams grade
Hypercellular
Hyperchromatic
Hyperchromasia
Hypergranulosis
Hyperkeratosis
Hyperplasia
Hypertrophy
Hypocellular

I

Immunohistochemistry (IHC)
Immunoglobulin
Immunoreactivity
Immunostain
Inadequate
Infiltrative
Infiltration
Inflammation
Inflammatory cell
Ischemic necrosis
Isolated tumour cells (ITCs)
Insufficient for diagnosis
Intercellular bridges
Intestinal metaplasia
Intracytoplasmic
In-transit metastasis
In toto
Invasion

J

K

Karyotype
Keratinization
Ki-67
Koilocytes
KRAS

L

Lamina propria
Lesion
Leukocyte
Limited for interpretation
Low-grade squamous intraepithelial lesion (LSIL)
Lymphoid aggregate
Lymphocyte
Lymphocytosis
Lymphovascular invasion (LVI)
Lymphoma
Lymph node

M

Margin
Mass
Malignant
Malignant neoplasm
Melanocyte
Melanoma
Metaplasia
Metastasis
Mesothelial cells
MIB-1
Microcalcification
Minimally invasive
Mismatch repair (MMR)
Mitosis
Mitotic figure
Mucosa
Mucin
Mucinous
Mucicarmine
Multifocal
Myxoid

N

Neoplasm
Necrosis
Necrotizing granulomatous inflammation
Negative for malignancy
Neutrophil
Neuroendocrine cell
Neuroendocrine tumour
Non-diagnostic
Non-Hodgkin lymphoma
Non-necrotizing granulomatous inflammation
Non-reactive
Non-small cell carcinoma
Nottingham histologic grade
Nucleus
Nucleoli

O

Oncocytic
Oral cavity
Oropharynx
Osteoid

P

p16
p40
p53
p63
Pancreatic heterotopia
Pancreatic metaplasia
Paneth cell metaplasia
Papillary
PASS score
PAX-8
Periodic Acid Schiff (PAS)
Periodic Acid Schiff plus Diastase (PAS-D)
Parakeratosis
Perineural invasion (PNI)
Plasma cell
Pleomorphic
Polyp
Precursor
Progesterone receptor (PR)
Proximal
Prognosis
Poorly differentiated
Positive for malignancy
pTNM

Q

R

Red blood cells (RBCs)
Reactive changes
Reactive lymphoid hyperplasia​
Resection
Ring sideroblasts​

S

S100
Sarcoma
Sarcomatoid
Sentinel lymph node
Signet ring cell
Small bowel mucosa
Solar elastosis
SOX10
Stoma
Stroma
Squamous cell
Squamous cell carcinoma
Special stain
Specimen
Spindle cell
Spindle cell neoplasm
Spongiosis
Spongiotic
Synaptophysin
Syndrome​
Synoptic report

T

T cells
Tangentially sectioned
Testicle
Transformation zone
TTF-1
Tubal metaplasia
Tumour
Tumour capsule​
Tumour deposit
Tumour infiltrating lymphocytes (TILs)
Tumour necrosis
Tumour regression
Thyroglobulin
Thyroid nodule

U

Ulcer
Ulcerative colitis
Undifferentiated
Urothelial cell​
Uterus

V

Vasculitis
Viral cytopathic effects
Virus

W

Well-differentiated

X

Xanthoma

Y

Z

A+ A A-