7 July 2021: Pathology Images of the Week

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

CNS tumor > Papillary craniopharyngioma

Classic low power cauliflower-like configuration with smooth borders.

Contributed by Nelli S. Lakis M.D., M.Sc.

Nasal cavity, paranasal sinuses, nasopharynx > Sinonasal undifferentiated carcinoma

Sheets of undifferentiated malignant epithelial cells with vesicular nuclear chromatin and prominent nucleoli.

Contributed by Bin Xu, M.D., Ph.D. and Abeer Salama, M.D.

Placenta > Choriocarcinoma

Intraplacental choriocarcinoma showing atypical syncytiotrophoblast, cytotrophoblast and intermediate trophoblast adjacent to uninvolved chorionic villi (H&E, 200x).

Contributed by Tatyana Zinger, D.O.

Small intestine & ampulla > Heterotopic gastric mucosa

Polypoid lesion predominantly lined by gastric foveolar epithelium and small intestinal epithelium on the left side.

Contributed by Khalid Amin, M.D.

Liver & intrahepatic bile ducts > Hepatocellular adenoma

HNF1A mutated hepatocellular adenoma: low power view showing well defined border between the lesion (right) and background liver (left).

Contributed by Monica Abdelmalak, M.D.