I’ve tried to keep up with this blog more often now that we are further into the semester, but I finally can take a moment after 6 exams this week to write about the specimens we grossed in the morgue lab. This will be the first specimen post I’m creating so if you’re reading and do not feel comfortable looking at real images of real organ parts I would suggest reading no further. Every other Friday we are allowed to practice what we learned in our anatomical techniques course. This is the course that we learn how to “gross” a specimen. Grossing involves the complete process of investigating a piece of organ you receive from doctors and being able to describe the specimen to put into a dictation, which is a summary of measurements and descriptive terms to give a visual image. The doctors won’t see the original whole specimen before you take small representative samples from it, so it is important to be descriptive as possible. There is a lot of detail and different steps to treating the same organ based on tumors or other diseased processes. There are many different health care professionals involved in the diagnostic process. In general, a patient has surgery and gets a piece of organ or tissue removed, it ends up going to a PA, we do our job and send a specimen to the next department, often histologists, who can make a microscope slide to then have a pathologist see the tissue under the microscope. So maybe giving a scenario will make this make sense. A patient comes in and receives a radiograph and a small tumor is seen on the inside of a lung. Surgery is performed and a small piece of lung gets removed. The surgeon makes a specific shaped cut called a wedge that can save as much as that healthy lung as possible (see last image for resections of lungs). The surgeon staples up the lung inside of the patient like “stitches” and closes with more staples where the cut marks are made on that little wedge piece to show that part is continuous with the rest of the lung. This part is important because often a tumor stage of an organ is dependent on the size and where other locations in the body it may have spread to or “invaded”. So, for a lung the tumor could grow inward towards other lobe sections or onto the outside into the body cavity or even towards the heart and other structures around. This little piece shows up on our bench, what do we do with it? That’s the question we are always asked because there are rules and guidelines to follow to properly inspect and give a lot of information. First you measure how big this wedge is and see if there are any abnormal divots called “puckering” that could be a sign of tumor inside. We use ink and place it on those divots or other abnormal areas. Then we can start trimming off that staple line of tissue and we use ink to mark where that resection margin line is under it. We make cuts in a perpendicular fashion in relation to that margin, 3mm thick section are required so that we can chose a piece that can be placed in a fixative such as formalin that can make mushy tissue harder without ruining the structure of cells. This makes histology possible to cut paper thin slices to mount on a microscope slide. We don’t just cut up specimens and make a million slides and a million cassettes and use every piece all the time. We need to select and use judgment and follow guidelines of what will give the best diagnostic piece.

lung wedge with staple margin tissue 
lung wedge 
cassette tissue are placed in to get fixed by formalin
We take a piece of tissue that would show relationship of the margin line tissue to a tumor, a piece that shows the tumor to the opposite side of the lung which is the pleural surface and a section that shows “full face” or the tumor in its largest dimension. And then a piece of uninvolved healthy tissue is submitted too. These types of pieces give enough information for the pathologist to decide if they got enough of the lung out if the margins are clear of infectious tumor or if more needs taken out and the type of tumor that is involved. Now, the scenario changes if the patient had a lung wedge for interstitial disease such as emphysema. We don’t do that whole process now! We do not cut up the organ off the bat. We re-inflate the wedge using a small syringe and needle on the side, allowing air in to show if the air spaces are opening to a normal diameter and then put the specimen in fixative, almost so it molds into that shape. There are many different diseases and steps and processes and that is just for one little lung wedge. We do this for a wide arrange of specimens. Pretty much anything that is removed from a person at a specialist like a dermatologist, GYN, or in the OR can land in our bench and we need to know how to handle it. The pictures below show a “partial nephrectomy” which is a kidney wedge version of the lung and we process that in a similar fashion to a lung wedge for tumor. The other pictures with the staple line are the lung pieces we made during the grossing session. Next specimen posts will be shorter than this, but I wanted to explain how we do our job!

partial nephrectomy before grossing 
grossing practice for the class in the morgue 
3mm sections of kidney
