| Structure | Description
| | Amyloid | Amyloid fibrils, with inset demonstrating array of fibrils
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| Adrenoleukodystrophy | Adrenoleukodystrophy, adrenal gland, with long parallel inclusions of long chain fatty acids
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| Birbeck granules | Birbeck granules (inset shows several at higher magnification) from a case of histiocytosis X
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| Histiocytosis X | Cell with a clefted nucleus from a case of histiocytosis X
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| Bacteria | Pseudomonas bacteria
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| Cryptosporidia | Cryptosporidia along small intestinal brush border
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| Herpes simplex virus | Herpes simplex virus in brain, viral particles (inset) in nucleus
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| JC papovavirus | Progressive multifocal leukoencephalopathy (PML) with JC virus in brain, small round dark viral particles in nucleus
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| HIV-1 | Human immunodeficiency virus, viral particles at low magnification adjacent to cell surface
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| HIV-1 | Human immunodeficiency virus, viral particles at medium magnification
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| HIV-1 | Human immunodeficiency virus, viral particle budding from cell surface at top, and complete viral particle at bottom, high magnification
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| Inclusion body myositis | Skeletal muscle with inclusion body myositis
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| Nemaline myopathy | Skeletal muscle with nemaline rods
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| Structure | Description
| | Adenocarcinoma | Adenocarcinoma with several features typical of a neoplasm of epithelial origin, including a junctional complex (tight junction at asterisk, desmonsomes at crosses, and a mucin granule M) and lumenal microvilli at the upper right
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| Junctional complex | Junctional complex, higher magnification, with tight junction at right and desmosomes at left
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| Squamous cell carcinoma | Squamous cell carcinoma with many desomosomes and cytoplasmic tonofilaments streaming to the left
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| Microvilli | Microvilli seen in cell from adenocarcinoma of the colon (inset shows the dense core rootlets below and the rounded glycocalyceal bodies in the villi above
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| Intracytoplasmic lumen | Intracytoplasmic lumen in a cell from metastatic carcinoma of breast
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| Leiomyosarcoma | Leiomyosarcoma demonstrating cytoplasmic filaments with condensations to the left of the nucleus, a lipid body at the far left, and subplasmalemmal filament condensations and pinocytotic vesicles near nucleus at the right (also seen in the inset)
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| Mesothelioma | Mesothelioma of pleura with long, curved microvilli
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| Ewing's sarcoma | Ewing's sarcoma of bone with extensive cytoplasmic glycogen deposits
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| Premelanosomes | Premelanosomes from a malignant melanoma, composite of two cases
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| Melanosomes | Melanosomes (inset shows the dark oblong melanosomes in more detail) from a malignant melanoma
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| Adrenal carcinoma | Large mitochondria with tubular cristae above normal mitochondria in a cell from adrenal cortical carcinoma
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| Neurosecretory granules | Neurosecretory granules (some with a thin surrounding halo) in a neuroendocrine neoplasm
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