A rare case of anal tumor: Anal carcinosarcoma

Figure 1 Magnetic resonance imaging images of the patient. A: Initial magnetic resonance imaging (MRI) scan showing rectal wall invasion to over one third of the circumference of the rectum, extending beyond the rectal wall; B: MRI scan performed 2 mo following completion of treatment: a favourable response was reported with a reduction in size from 30 to 19 mm, but with a remaining suspicious area of rectal wall extension (T3); C: MRI scan 4 mo post excision showed no residual disease.

Figure 2 Hematoxylin and eosin stain slides of initial anal biopsy pathology specimen. A: Anal mucosa showing infiltration by tumour; B: Pleomorphic cytology and fibrotic changes in some areas of tumour; C: Tumour with spindle and epithelioid nuclei; D: Tumour with pleomorphism and frequ.