Evaluation and Interpretation

Almost every slide carries some damage introduced between the specimen jar and the coverslip, and the technologist is the first person able to name it. Folds, chatter, knife lines, floaters, retraction spaces, stain precipitate, bubbles and freezing holes all mimic pathology convincingly enough to mislead. The habit that separates the two is asking where the feature sits and whether it repeats: anything that runs across tissue and bare glass alike, or lands in the same place on every level, comes from the process rather than the patient. Recognising the pattern lets you name the failing step, recut or restain, and release a slide the pathologist can trust.

Reviewing H&E levels from a renal core biopsy before releasing the case, a technologist sees a fine straight line crossing every section at exactly the same point, parallel to the direction of cutting. Which conclusion is best supported?

AA defect in the microtome blade edgeBA capillary running through the cortexCA collagen band within the medullaDA fold introduced at the water bath

Suspected fungal infection prompts a GMS stain on a wedge of lung tissue. The finished section shows abundant coarse black granular material lying over the tissue and spilling onto the surrounding glass, with no branching or budding forms visible anywhere. What does this black material most likely represent?

AFungal spores throughout the alveoliBSilver precipitate from the stainCAnthracotic pigment in macrophagesDMelanin granules in tumour cells

Whole-slide scanning moves the quality check onto a monitor, and it introduces failure modes that glass never had. A scan can be perfectly focused at the edges and unusable in the centre, can miss tissue that fell outside the capture area, can tile with visible seams, or can shift colour so that nuclei read brown instead of blue. The technologist reviews the captured image at low and high power before the case is released, compares anything doubtful against the glass slide, and decides whether the fault sits in the section, the stain or the scanner. Only the last of those is fixed by rescanning.

A pathologist reports that a whole-slide scan of a colonic resection is unreadable through the middle of the tissue, although the edges of the same image are crisp at high power. The glass slide is retrieved and checked: the section is flat, intact and properly mounted. What should the technologist do first?

ARecut the block at a thinner settingBRehydrate and restain the sectionCRescan with added focus pointsDAdjust the viewer's colour balance

On the reporting workstation, a scanned H&E section of liver shows nuclei that appear brownish-pink instead of the expected blue-purple, and the whole image carries a warm cast. The same slide examined down the microscope shows normal nuclear and cytoplasmic colour. What is the most likely explanation?

AThe haematoxylin was underdevelopedBThe section was cut too thicklyCEosin was left on far too longDWhite balance drift in the scanner