9 June 2021: Pathology Images of the Week

Here is a selection of new images from our free, online textbook:

Salivary glands > Mucoepidermoid carcinoma

Solid areas of the tumor are formed by different proportions of epidermoid (squamous) cells (red arrow), mucus cells (green arrow) and intermediate cells (yellow arrow) (histopathology, H&E stain, 10x).

Contributed by Rema A. Rao, M.D. and Saeed Asiry, M.D.

Skin melanocytic tumor > Invasive melanoma

44 year old woman with 0.8 cm nodule on her back. Scanning magnification shows a nodular melanocytic proliferation with minimal junctional component (2x).

Contributed by Michele Donati, M.D.

Skin nonmelanocytic tumor > Keratoacanthoma

An endophytic squamous proliferation with central crater filled with keratin.

Contributed by Poonam Sharma, M.B.B.S.

Bladder, ureter & renal pelvis > Urothelial carcinoma – invasive > Nested

Anastomosing, irregular, large nested and inverted growth of cytologically bland urothelium with desmoplastic stromal reaction (4x).

Contributed by Megan L. Brown, M.D. and Maria Tretiakova, M.D., Ph.D.

Esophagus > Ectopic sebaceous glands

Mature sebaceous gland within the lamina propria.

Contributed by Yukihiro Nakanishi M.D., Ph.D.

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