Cytology , Dermatology , Dermatology Details

Dermatology Diagnostics: Cutaneous Cytology

Dermatology Diagnostics: Cutaneous Cytology
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Chris Reeder, DVM, DACVD
BluePearl Veterinary Partners, Franklin, Tennessee

Cytology is one of the most important yet commonly underused tools in veterinary medicine. It is a quick, easy, and inexpensive means of gathering a tremendous amount of diagnostic information, much the same as running fecal floats, blood smears, and serum chemistries/complete blood counts. According to Christopher et al in the Journal of the American Veterinary Medical Association, “Cutaneous/subcutaneous cytology are most accurate for diagnosis of lesions, whereas liver cytology is least accurate.”1 Moreover, Ruocco et al report that “Exfoliative cytology for diagnostic purposes is rarely used in dermatology despite the rapid and reliable results which this procedure can offer in many clinical conditions.”2 Knowing how to take cytologic samples and how to interpret those samples can be critical to an animal’s health, disease management, and overall wellbeing.

OBTAINING SAMPLES

Ear Canal

The best method for obtaining material from the ear is with a cotton-tipped applicator; however, the health of the ear may limit access to sampling sites. For example, if a dog has end-stage proliferative ear disease, the degree of stenosis may make insertion of the applicator into the ear canal impossible. A 5-French red rubber catheter may be used to obtain samples from more stenotic ear canals. If a dog has a patent ear canal with a ruptured or absent tympanic membrane, sampling of the middle ear may be possible. In these cases, a red rubber or tomcat catheter can be used to obtain the sample while the patient is under general anesthesia. If the tympanic membrane is intact, a myringotomy using a spinal needle will be required. Specific techniques on myringotomy may be found in Mueller and Kirk’s Small Animal Dermatology, 7th edition.

  • Try to obtain a sample at the junction of the vertical and horizontal canals. This is approximately the farthest it is possible to see into the ear without an otoscope.
  • Roll this material onto a glass slide. I like to write “R” for right and “L” for left on the slide to identify the side from which each sample was obtained (Figure 1).

FIGURE 1. Ear cytology: Right and left markers.

Griffin et al found that heat fixing versus not heat fixing otic exudate on glass slides before staining did not increase or decrease the number of Malassezia yeast organisms found on cytologic evaluation.3 I prefer the slide to be heat fixed, then stained with a quick stain (eg, DiffQuik).

Claw Skin Folds

Two methods exist for taking samples from claw folds (cuticle areas):

  • Using the edge of a glass slide to obtain the debris (usually a waxy substance) by scraping from distal to proximal in a scooping motion at a 30° to 45° angle.
  • Using a cotton-tipped applicator broken in half. The stick portion should have a beveled edge. Use the beveled edge to gently scrape or extract material from around the proximal claw/claw skin folds and rub it onto a glass slide (Figure 2). This method may be preferable to using a glass slide directly in these areas, which can be challenging and could result in the slide breaking. The amount of material/debris will be very small.

FIGURE 2. Sampling claw folds.

The slide should be heat fixed and a quick stain used for preparation.

Skin Surface

In my experience, skin cytology is the diagnostic test most commonly missed in everyday referral cases. I find direct impression smears to be most rewarding.

  • Obtain a sample by scraping the skin with the edge of a glass slide at a 30° to 45° angle (Figure 3). This technique is useful for the paws, ventrum, pustules, papules, facial folds, and other areas.

FIGURE 3. Skin scraping

  • Consider tape preps, which tend to be more useful in areas that are very dry or difficult to access with a slide, such as interdigital spaces, facial or tail folds, and periocular areas.
  1. Using a clear, cellophane-type tape, press the sticky portion directly onto the area of interest.
  2. Stain the sample only by using the stain and counterstain (red and purple), then affix the tape directly to a glass slide for evaluation.
  3. Note that fixative will remove the sticky portion along with the sample.

INTERPRETING CYTOLOGIC RESULTS

Basic Microscopy

Always start at low power! The most common mistake made in viewing cytologic preparations is going directly to 100× magnification. Starting at 4× allows identification of specific areas of the slide for examination at higher powers. It also enables observation of findings that might be missed at 100×, such as acantholytic cells and Demodex mites (Figures 4 and 5).

As the magnification increases, so should the light intensity. When looking for Demodex mites or fungal spores, lower the condenser so that the light intensity does not “burn” through these organisms.

FIGURE 4. Acantholytic cells.

FIGURE 5. Demodex mite.

Inflammatory Cells

Inflammatory cells are seen in almost all skin cytologic examinations and occasionally on ear canal and claw fold cytology. The presence of different inflammatory cells may be a guide to suspect certain diseases, such as pemphigus complex, cutaneous lupus, mucocutaneous pyoderma, or even allergies.

Neutrophils

Neutrophils are acute inflammatory cells that destroy infectious organisms and are the main component of pus. Intracellular bacteria should be scanned for because the presence of these bacteria is the true definition of skin infection. The presence of numerous bacteria with no intracellular bacteria may be the result of immunosuppression (eg, Cushing’s disease, hypothyroidism, neoplasia) or bacterial overgrowth. In light of current concerns about resistance to antimicrobial drugs, I recommend treating these cases topically with an antimicrobial product (eg, chlorhexidine, micronized silver, Triz EDTA) as the first step. Neutrophils release many proteolytic enzymes responsible for inflammation and tissue damage (Figure 6).

FIGURE 6. Neutrophils.

Eosinophils

Eosinophils are filled with red (eosinophilic) granules (Figure 7). Eosinophils produce numerous cytokines and mediators to kill microorganisms and attract other cells, such as mast cells. These cells are also phagocytic and are capable of ingesting bacteria and fungi. Finding eosinophils on skin cytology suggests the presence of parasites, fungi, or food allergies. Eosinophils are rarely found in dogs with atopic dermatitis, although they are common in cats.

FIGURE 7. Eosinophils.

Lymphocytes

Lymphocytes are usually seen later in the course of skin disease and are not usually found in large numbers. Small, medium, and large lymphocytes may be seen. These cells direct activities of other cells (eg, neutrophils, eosinophils, keratinocytes) through the release of various messaging molecules, or cytokines. Large lymphocytes are sometimes seen in dogs with cutaneous lymphoma (Figure 8).

FIGURE 8. Atypical lymphocytes (consistent with cutaneous lymphoma).

Mast Cells

Mast cells are also found later in a disease process (Figure 9). They are the major producer of histamine and are involved to a large extent in allergic skin disease. Usually they are seen only in ulcerated areas of dermal mast cell tumors.

FIGURE 9. Mast cell (center).

Nuclear Streaming

When cells rupture during sampling, nuclear content (DNA) is often seen on cytology. Nuclear streaming looks like fine threads of eosinophilic material (Figure 10). It does not indicate anything other than the rupturing of cells during sample collection. It can help to outline fungal spores, bacteria, and yeast, so look for these organisms in areas with larger amounts of nuclear streaming.

FIGURE 10. Nuclear streaming.

Parasites

Demodex, Otodectes, scabies, or other mites may be visible on cytologic preparations if the infection is severe enough. These are large organisms and are best evaluated with 4× to 10× magnification. They are not common but are of diagnostic value if seen.

Fungi

Fungal spores from dermatophytes (ringworm) can be seen within neutrophils, can be free, or can be present within nuclear streaming. These very small, round organisms have a clear halo and basophilic center (Figure 11). They are about half the size of an average red blood cell.

Insert T1703C10Fig11.jpg

Yeast

Two genera of yeast are seen: Malassezia species are more common in the United States than Candida species, which tend to be more common in Europe. Malassezia species have been described as peanut-, snowman-, footprint-, or bowling pin–shaped basophilic organisms. These organisms are defined as a broad-based budding yeast.

FIGURE 11. Fungal spores

Bacteria

Bacteria are the most common infectious organisms I find on cytologic examination. Two distinct shapes are most common: cocci and rods. Cocci are round, basophilic bacteria found individually, in clusters, or in large groups (Figure 10). If intracellular cocci are found, a true infection is present. Rods are often found individually or in sets of 2 placed end to end, called diploid rods (Figure 12). Cocci are most often Staphylococcus or Streptococcus species. Rods are often Escherichia coli, Pseudomonas species, or Klebsiella species. Remember, quick stains stain all bacteria purple; they do not distinguish gram-positive from gram-negative bacteria. Bacterial cultures should be performed any time rods are seen on cytology. Bacteria always go in and out of focus when the fine focus on the microscope is used, whereas melanin granules have a refractory/reflective quality.

FIGURE 12. Rods with inflammatory cells.

Melanin Granules

Melanin granules are commonly mistaken for bacteria and are normally seen on pigmented areas of the skin. They are golden to brown in color and mostly rod-shaped; they have a refractive/reflective quality when going in and out of fine focus (Figure 13). Melanin granules are usually seen attached to keratinocytes, but they can be seen free on the slide.

FIGURE 13. Melanin granules.

Keratinocytes

Most keratinocytes are octagonal to square and squamous in composition. Keratinocytes may display some interesting features that may be normal or abnormal, such as inclusion of keratohyaline granules or rounded acantholytic cells.

Keratohyaline Granules

These granules are present in immature skin cells in the granular layer and are involved in “cementing” the cells together when fully mature. All species have these granules, which may be seen in keratinocytes that are chronically irritated (eg, in allergic dogs/cats). Keratohyaline granules are large eosinophilic granules. Dogs have round granules and cats have rod-shaped granules (similar to eosinophils; Figure 14).

Acantholytic Cells

These keratinocytes have lost their intercellular connections deeper in the epidermis and are usually found in animals with immune-mediated disease, such as pemphigus. Occasionally, severe bacterial infections and dermatophytosis can cause these cells to develop. Acantholytic cells are “fried egg”–shaped, with a deeply basophilic, centrally located nucleus (Figure 4). These are very important to recognize and are considered abnormal in any animal.

FIGURE 14. Keratohyaline granules.

 References

  1. Christopher MM, Hotz CS, Shelly SM, Pion PD. Use of cytology as a diagnostic method in veterinary practice and assessment of communication between veterinary practitioners and veterinary clinical pathologists. JAVMA 2008; 232(5):747-754.
  2. Ruocco E, Brunetti G, Vecchio M Del, Ruocco V. The practical use of cytology for diagnosis in dermatology. J Eur Acad Dermatol Venereol 2011; 25(2):125-129.
  3. Griffin JS, Scott DW, Erb HN. Malassezia otitis externa in the dog: the effect of heat-fixing otic exudate for cytological analysis. J Vet Med 2007; 54(8):393-448.

Chris Reeder, DVM, DACVD, is a graduate of Auburn University’s College of Veterinary Medicine and board-certified in veterinary dermatology. Dr. Reeder has published several articles both nationally and internationally and enjoys lecturing to local and national audiences on dermatology. He has served on several committees for the American College of Veterinary Dermatology, including the credentials committee and ad hoc exam committee. Dr. Reeder’s special interests include otitis externa, dermatopathology, and immune-mediated skin disease.

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value='Monaco' >Monaco</option><option value='Mongolia' >Mongolia</option><option value='Montenegro' >Montenegro</option><option value='Montserrat' >Montserrat</option><option value='Morocco' >Morocco</option><option value='Mozambique' >Mozambique</option><option value='Myanmar' >Myanmar</option><option value='Namibia' >Namibia</option><option value='Nauru' >Nauru</option><option value='Nepal' >Nepal</option><option value='Netherlands' >Netherlands</option><option value='New Caledonia' >New Caledonia</option><option value='New Zealand' >New Zealand</option><option value='Nicaragua' >Nicaragua</option><option value='Niger' >Niger</option><option value='Nigeria' >Nigeria</option><option value='Niue' >Niue</option><option value='Norfolk Island' >Norfolk Island</option><option value='North Korea' >North Korea</option><option value='Northern Mariana Islands' >Northern Mariana Islands</option><option value='Norway' >Norway</option><option value='Oman' >Oman</option><option value='Pakistan' >Pakistan</option><option value='Palau' >Palau</option><option value='Palestine, State of' >Palestine, State of</option><option value='Panama' >Panama</option><option value='Papua New Guinea' >Papua New Guinea</option><option value='Paraguay' >Paraguay</option><option value='Peru' >Peru</option><option value='Philippines' >Philippines</option><option value='Pitcairn' >Pitcairn</option><option value='Poland' >Poland</option><option value='Portugal' >Portugal</option><option value='Puerto Rico' >Puerto Rico</option><option value='Qatar' >Qatar</option><option value='Réunion' >Réunion</option><option value='Romania' >Romania</option><option value='Russia' >Russia</option><option value='Rwanda' >Rwanda</option><option value='Saint Barthélemy' >Saint Barthélemy</option><option value='Saint Helena' >Saint Helena</option><option value='Saint Kitts and Nevis' >Saint Kitts and Nevis</option><option value='Saint Lucia' >Saint Lucia</option><option value='Saint Martin' >Saint Martin</option><option value='Saint Pierre and Miquelon' >Saint Pierre and Miquelon</option><option value='Saint Vincent and the Grenadines' >Saint Vincent and the Grenadines</option><option value='Samoa' >Samoa</option><option value='San Marino' >San Marino</option><option value='Sao Tome and Principe' >Sao Tome and Principe</option><option value='Saudi Arabia' >Saudi Arabia</option><option value='Senegal' >Senegal</option><option value='Serbia' >Serbia</option><option value='Seychelles' >Seychelles</option><option value='Sierra Leone' >Sierra Leone</option><option value='Singapore' >Singapore</option><option value='Sint Maarten' >Sint Maarten</option><option value='Slovakia' >Slovakia</option><option value='Slovenia' >Slovenia</option><option value='Solomon Islands' >Solomon Islands</option><option value='Somalia' >Somalia</option><option value='South Africa' >South Africa</option><option value='South Georgia' >South Georgia</option><option value='South Korea' >South Korea</option><option value='South Sudan' >South Sudan</option><option value='Spain' >Spain</option><option value='Sri Lanka' >Sri Lanka</option><option value='Sudan' >Sudan</option><option value='Suriname' >Suriname</option><option value='Svalbard and Jan Mayen Islands' >Svalbard and Jan Mayen Islands</option><option value='Sweden' >Sweden</option><option value='Switzerland' >Switzerland</option><option value='Syria' >Syria</option><option value='Taiwan' >Taiwan</option><option value='Tajikistan' >Tajikistan</option><option value='Tanzania' >Tanzania</option><option value='Thailand' >Thailand</option><option value='Timor-Leste' >Timor-Leste</option><option value='Togo' >Togo</option><option value='Tokelau' >Tokelau</option><option value='Tonga' >Tonga</option><option value='Trinidad and Tobago' >Trinidad and Tobago</option><option value='Tunisia' >Tunisia</option><option value='Turkey' >Turkey</option><option value='Turkmenistan' >Turkmenistan</option><option value='Turks and Caicos Islands' >Turks and Caicos Islands</option><option value='Tuvalu' >Tuvalu</option><option value='Uganda' >Uganda</option><option value='Ukraine' >Ukraine</option><option value='United Arab Emirates' >United Arab Emirates</option><option value='United Kingdom' >United Kingdom</option><option value='United States' >United States</option><option value='Uruguay' >Uruguay</option><option value='US Minor Outlying Islands' >US Minor Outlying Islands</option><option value='Uzbekistan' >Uzbekistan</option><option value='Vanuatu' >Vanuatu</option><option value='Venezuela' >Venezuela</option><option value='Vietnam' >Vietnam</option><option value='Virgin Islands, British' >Virgin Islands, British</option><option value='Virgin Islands, U.S.' >Virgin Islands, U.S.</option><option value='Wallis and Futuna' >Wallis and Futuna</option><option value='Western Sahara' >Western Sahara</option><option value='Yemen' >Yemen</option><option value='Zambia' >Zambia</option><option value='Zimbabwe' 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