What is cryostat sectioning?

What is cryostat sectioning?

Cryostats are used in medicine to cut histological slides. They are usually used in a process called frozen section histology (see Frozen section procedure). The cryostat is essentially an ultrafine “deli-slicer”, called a microtome, placed in a freezer.

What is cryostat procedure?

The cryostat is the instrument to freeze the tissue and also to cut the frozen tissue for microscopic section. The rapid freezing of the tissue sample converts the water into ice. The firm ice within the tissue acts as embedding media to cut the tissue.

Why cryostat sectioning is used to analyze the tissue during surgery?

The cryostat freezes the tissue allowing it to be cut for a microscopic section. The conversion of water into ice acts as the embedding media for cutting the tissue. It is a technique that is mostly used for the rapid diagnosis of lesions during intraoperative management.

What is the medical term for frozen section?

The frozen section procedure is a pathological laboratory procedure to perform rapid microscopic analysis of a specimen. It is used most often in oncological surgery. The technical name for this procedure is cryosection.

Why is a cryostat important?

Cryostats are very important in the field of medicine and other related fields. Their main purpose is to maintain low cryogenic temperatures of human, animal, or plant tissue specimens. Devices can also be mounted within the cryostat machine.

What is a cryostat microtome used for?

A cryostat is a microtome machine for cutting tissue at low temperatures (typically around − 15 to − 30 °C) (Figure 55).

How do you make tissue for cryostat sectioning?

Remove tissue from liquid nitrogen and place blocked tissue on dry ice. (Tissue may be kept in plastic container or plastic bags.) Store frozen tissue block in -80°C freezer until sectioning. For sectioning, attach the frozen tissue block on the cryostat chuck.

How do you prepare a cryostat sample?


  1. Freeze a fresh, unfixed tissue sample, up to 2.0 cm in diameter, in OCT in a suitable tissue mold.
  2. Cut sections 5-15 μm thick in the cryostat at −20°C.
  3. Within 1 min of cutting a tissue section, transfer the section to a room temperature microscope slide by touching the slide to the tissue.

What is the difference between cryostat and microtome?

What is a Cryostat? Similar to a standard microtome, a cryostat functions to obtain thin (1-10 mm in thickness) sections from a piece of tissue, but while a standard microtome carries the operation at room temperature, the cryostat enables the operator to section the tissue at low temperature (–20 to –30 C).

What is the difference between a cryostat and a freezing microtome?

What is the Difference Between Freezing Microtome and Cryostat? A freezing microtome is an instrument used to make thin sections of frozen tissues for microscopic studies. On the other hand, a cryostat is an instrument that maintains the cryogenic temperature of samples or devices that are placed inside it.

What is the difference between Mohs and frozen section?

While Mohs surgery preserves more skin and provides a greater reliability of complete excision, it can be expensive, time consuming, and unnecessary in certain, less cosmetically sensitive areas. Likewise, excision with frozen section is not necessary for every lesion removal.

How do you care for a cryostat in histopathology?

Remove the microtomy debris from the cryostat chamber and place into a fixative, disinfectant or wet bag for autoclaving. Clean the knife and all exposed surfaces and instruments with 70% ethanol. Wear protective clothing as for routine maintenance. Turn off the power and unplug the cryostat.

What is the importance of cryostat?

How do you freeze tissue for cryostat sectioning?

Freezing Tissues For Cryosectioning

  1. One simple method is to use dry ice (-70C) in block form placed in a styrofoam container.
  2. The method we prefer uses dry ice in pellet form.
  3. Isopentane also can be chilled in liquid nitrogen (-176C).
  4. Frozen tissues can be stored in a -80 freezer.

Is excision the same as Mohs?

Unlike traditional excision, the process of Mohs surgery involves a series of stages. During the first stage, your doctor will mark the area of tumor. S/he will then numb the area with a local anesthetic and uses a scalpel to remove a thin layer of the cancerous tissue.

Is Mohs better?

As mentioned earlier, Mohs is more reliable and boasts a higher cure rate (98%) than standard surgical excisions. Plus, Mohs is often the cheaper of the two surgeries. For these reasons, more and more patients are directed toward Mohs micrographic surgery to eliminate their basal or squamous cell carcinoma.

What are the advantages of cryostat?

The advantage of cryostat-cut frozen section is the preservation of cell density and tissue architecture, which is most important in the diagnosis of neurosurgical materials, especially in case of diffusely infiltrating glioma.

What’s the difference between squamous and basal?

Basal cells: These cells are in the lower part of the epidermis, called the basal cell layer. These cells constantly divide to form new cells to replace the squamous cells that wear off the skin’s surface. As these cells move up in the epidermis, they get flatter, eventually becoming squamous cells.