12 January 2022
: Case report 
A Case of Metaplastic Squamous Cell Carcinoma of the Breast that Showed a Pathological Complete Response After Neoadjuvant Chemotherapy with Weekly Paclitaxel
Unusual or unexpected effect of treatment
Aya Noro12BEF*, Makoto Ishitobi
2EF, Noriko Hanamura3BE, Yumi Kashikura4B, Masako Yamashita1B, Yuji Kozuka5DE, Kanako Saito6B, Toshiro Mizuno7B, Tomoko Ogawa2BE
DOI: 10.12659/AJCR.935035
Am J Case Rep 2022; 23:e935035
Figure 4. (A) Macroscopic finding of the tumor. A cystic area measuring approximately 8 mm was observed. (B) Histopathological findings of the cystic area (HE, ×20). (C) The cyst wall (✶) was covered by foamy histiocytes and lymphocytic infiltration, including calcification and hemosiderin-laden macrophages (HE, ×100). (D) Only necrotic tissue and foamy histiocytes were observed inside the cyst (✱). No tumor cells were detected in the resected specimen (HE, ×100). HE, hematoxylin and eosin.