Here is a selection of new images from our free, online textbook:
Lung > Lepidic adenocarcinoma
Noninvasive lepidic adenocarcinoma (left) juxtaposed with adjacent uninvolved lung parenchyma (right). The lepidic adenocarcinoma is characterized by thickened alveolar septa lined by atypical overlapping cuboidal cells.
Contributed by Jonathan Keow, M.D., Ph.D.
Skin nonmelanocytic tumor > Trichilemmal (pilar) type cysts
High power view of epithelial lining with maturation of squamous epithelium, which lacks a granular layer (trichilemmal differentiation).
Contributed by Aaron Muhlbauer, M.D. and Jodi Speiser, M.D.
Skin nontumor > Granuloma annulare
Palisaded granuloma annulare. Arm of a 50 year old woman.
Contributed by Stephen Somach, M.D.
Vulva, vagina & female urethra > Smooth muscle tumors
Leiomyosarcoma of the vulva, morphologically low grade, with moderately atypical, round to cigar shaped nuclei with focally prominent nucleoli (400x). Mitoses are rare (1 – 2 per 10 high power fields) and necrosis is absent.
Contributed by David B. Chapel, M.D.
Penis & scrotum > Cutaneous verruciform xanthoma
A low power view shows papillary / verrucous epithelial hyperplasia with band-like plasma cell infiltrate in the scrotum.
Contributed by Liwei Jia, M.D., Ph.D.
Autopsy & forensics > Blunt force injuries
Anterior cranial base fractures (yellow arrows).
Contributed by Lorenzo Gitto, M.D., Robert Stoppacher, M.D., Serenella Serinelli M.D., Ponni Arunkumar, M.D. and Luigi Bonaccorso, M.D.