Histopathology & Cytopathology
Histopathology & Cytopathology
Histology :
It is the study of microscopic structure of tissue.
Histopathology :
It is the microscopic study of diseased tissue.
Cytology :
It is the science that deals with the formation, structure and functions of cells.
Cytopathology :
It is the study of cellular changes in disease.
Biopsy :
Histopathological পরীক্ষার জন্য living body হইতে tissue অপসারণ বা removal কে Biopsy বলে।
Classification of biopsy :
- Open biopsy : ২ প্রকার :
- Incisional biopsy,
- Excisional biopsy
- Closed biopsy : ৫ প্রকার :
- Core-needle (percutaneous closed)biopsy : Breast mas, liver mass)
- Endoscopic biopsy (disease of stomach, oesophagus)
- Trephine biopsy (Bone marrow examination)
- Punch biopsy (it is done in rectal lesions)
- Ultrasono guided or CT guided biopsy: (as in Lung disease)
Indication of biopsy :
- Diagnosis of tuberculosis of lymph node.
- Diagnosis of benign tumour and malignant tumour.
- Diagnosis of lymphoma.
FNAC : Fine Needle Aspiration Cytology :
এটা একটা পদ্ধতি যেখানে small bore needle এর সাহায্যে cell ও তার সহযোগী fluid কে aspirate করা হয় এবং তারপর stain কৃত smear-এ cytological examination করা হয়।
Indications of FNAC :
নিম্নে উল্লেখিত palpable ও non-palpable mass lesion এর diagnosis-এ FNAC করা হয়।
- Palpable mass lesion in : Lymph node, Breast, Thyroid, Salivary gland and Soft tissue mass.
- Non-palpable mass lesion in : Abdominal cavity, Thoracic cavity, Retro-peritoneum space.
Water bath :
It is an instrument in which the desired temperature can be maintained by heating water around the container placed in it.The temperature of the water bath is controlled by a thermostatic arrangement.
Uses :
- Determination of serum enzyme at 37°c
- Serological determination at 56°c
- Enzymatic determination of glucose, urea, cholesterol, triglyceride at 37°c
- Saponification at 60°c-70°c
Paraffin bath :
This is an instrument used to melt paraffin wax from tissue slide embedding.The paraffin oven maintain a temperature between 50°c and 60°c.The oven may be provided with a water jacket which maintain a more even temperature.
Uses :
- Melting of paraffin
- Storing of molten paraffin
- Infiltration of paraffin in sections
- Drying of slide
- warming of solution during preparation of reagents.