Anal leiomyosarcoma: A case report and review of literature

INTRODUCTION

Leiomyosarcoma is a malignant neoplasm that is derived from smooth muscle cells in walls of small blood vessels or branch of the inferior vena cava, the uterus and the gastrointestinal tract. Different treatment options are present for the treatment of LMS. However, due to the rarity of LMS, the optimal treatment option is still to be discussed and determined.

PRESENTATION OF CASE

A 51-year-old male patient, previously healthy, presented for perianal pain. Biopsy of the mass found showed spindle cell tumors with mild atypia, dense cellularity, and pelvic MRI with contrast showed a well-circumscribed mass of the anus, developed between the layers of the external sphincter with possible invasion of the internal sphincter consistent with Leiomyosarcoma Grade I. Wide excision was performed. Close follow-up should be done every 3 to 6 months for the first 2 to 3 years, every 6 to 12 months for the following 3 years, and annually afterwards.

DISCUSSION

The symptoms of LMS include rectal bleeding with rectal and/or abdominal pain, weight loss, constipation, altered bowel motion and protruding mass. Treatment options include wide local excision, abdominoperineal resection, low anterior resection, bloc resection and pelvic exenteration. Patients who underwent wide local excision show a higher local recurrence rate as compared to patients who underwent radical resection. Distant metastasis is higher in patients who underwent radical resection.

CONCLUSION

The treatment options of anal LMS are controversial. At present, very few cases have been reported, thus no universally accepted standard of surgical treatment has been established.

[Rectal leiomyosarcoma, a rare malignant tumor diagnosed in ulcerative colitis]

Patients with chronic inflammatory diseases (IBD) of the digestive tract are known to have an increased risk of colorectal cancer. These are usually adenocarcinomas, and the occurrence of malignant mesenchymal tumours, particularly leiomyosarcomas, is exceptional. We report one case in a 40-year-old woman, followed for 9 years for ulcerative colitis. The tumour measured 2cm in length and infiltrated the entire rectal wall as far as the subserosa. It was composed of fusiform cells, with 5 mitoses for 10 fields at ×400 magnification, and expressing actin, desmin and caldesmone under immunohistochemical study. We review the 2 cases of leiomyosarcomas associated with Crohn's disease and 3 cases developed during ulcerative colitis published in the literature.