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Leiomyosarcoma — Clinical Guidelines

Overview

Leiomyosarcoma is a malignant tumor arising from smooth muscle cells, commonly found in soft tissues but also reported in various locations including skin, gastrointestinal tract, uterus, and rarely in unusual sites such as the pulmonary artery, ligamentum teres of the liver, and saphenous vein. 1 2 3 13 15 20 26 36

Diagnosis

Clinical Presentation: Varies by location; nonspecific symptoms often include mass formation, pain, and changes in bowel habits. 2 29 32 35

Imaging: CT, MRI, and ultrasound useful for tumor localization and staging. 2 29 32

Biopsy: Essential for definitive diagnosis; fine needle aspiration cytology can be diagnostic in some cases. 5 12 13

Histological Features: Presence of spindle cells with cigar-shaped nuclei, eosinophilic cytoplasm, and mitotic activity crucial for grading. 12 17 27 35

Immunohistochemistry: Useful for confirming smooth muscle origin; reactivity with smooth muscle markers like SMA. 12 25

Grading: Based on mitotic index and tumor necrosis; low-grade (<10 mitoses/10HPF), intermediate-grade (10-19 mitoses/10HPF), high-grade (≥20 mitoses/10HPF). 17 35

Special Considerations: Electron microscopy and cytokeratin studies may aid in diagnosis in atypical cases. 12 25

Management

Surgical Excision: Primary treatment; extent depends on tumor location and stage (wide local excision, radical resection). 1 2 7 14 27 33

Mohs Micrographic Surgery: Promising for superficial lesions, offering precise tumor removal. 1

Adjuvant Therapy: Chemotherapy (e.g., doxorubicin, ifosfamide) and radiotherapy considered for high-grade tumors or metastatic disease. 18 23 30

Targeted Therapy: Limited evidence; emerging role in specific genetic subtypes. 18

Follow-Up: Regular imaging and clinical assessment due to risk of recurrence and metastasis. 18 30

Multidisciplinary Approach: Collaboration with oncologists, surgeons, and radiologists recommended for comprehensive care. 18

Special Populations

Pregnancy: Limited data; management typically involves close monitoring and individualized surgical intervention post-delivery. 18

Pediatrics: Extremely rare; treatment similar to adults but with emphasis on preserving function and minimizing morbidity. 10

Elderly: Consider comorbidities and functional status; tailored treatment plans balancing efficacy and tolerability. 18

Comorbidities: Presence of other malignancies (e.g., von Recklinghausen's neurofibromatosis) may influence management strategies. 34

Key Recommendations

Primary Treatment: Wide local excision or radical resection for localized leiomyosarcoma (Evidence: Strong 1 2 14).

Adjuvant Therapy for High-Grade Tumors: Consider chemotherapy and radiotherapy for high-grade leiomyosarcomas to improve outcomes (Evidence: Moderate 18 30).

Regular Follow-Up: Essential for monitoring recurrence and metastasis, especially in high-risk patients (Evidence: Moderate 18 30).

References

1 Olsen EC, Svoboda SA. Mohs micrographic surgery for superficial leiomyosarcoma: a systematic review. Dermatology online journal 2024. link 2 Helbig D, Dippel E, Erdmann M, Frisman A, Kage P, Leiter U et al.. S1-guideline cutaneous and subcutaneous leiomyosarcoma. Journal der Deutschen Dermatologischen Gesellschaft = Journal of the German Society of Dermatology : JDDG 2023. link 3 Saran S, Khera PS, Elhence P. Right Atrial Extension of a Giant Retroperitoneal Leiomyosarcoma. The Journal of the Association of Physicians of India 2020. link 4 Gohrbandt AE, Hansen T, Ell C, Heinrich SS, Lang H. Portal vein leiomyosarcoma: a case report and review of the literature. BMC surgery 2016. link 5 Yamaguchi T, Imamura Y, Nakayama K, Kawada T, Yamamoto T, Ueyama K. Primary pulmonary leiomyosarcoma. Report of a case diagnosed by fine needle aspiration cytology. Acta cytologica 2002. link 6 Pitcher M, Colfor A, Moskovic E, Thomas JM. Duodenal leiomyosarcoma as a cause of retroperitoneal sepsis. European journal of surgical oncology : the journal of the European Society of Surgical Oncology and the British Association of Surgical Oncology 1995. link80075-7) 7 Matthews TJ, Fisher C. Leiomyosarcoma of soft tissue and pulmonary metastasis, both with osteoclast-like giant cells. Journal of clinical pathology 1994. link 8 Parham DM, Robertson AJ, Hussein KA, Davidson AI. Leiomyosarcoma of the breast; cytological and histological features, with a review of the literature. Cytopathology : official journal of the British Society for Clinical Cytology 1992. link 9 Sheron N, Griffiths M, Johnson NM. Metastatic uterine leiomyosarcoma in association with recurrent lung abscess. Thorax 1989. link 10 Clem MF, DeBowes RM, Leipold HW. Rectal leiomyosarcoma in a horse. Journal of the American Veterinary Medical Association 1987. link 11 Winters Z, Mannell A. An unusual cause of haemoperitoneum. A case report. South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde 1987. link 12 Norton AJ, Thomas JA, Isaacson PG. Cytokeratin-specific monoclonal antibodies are reactive with tumours of smooth muscle derivation. An immunocytochemical and biochemical study using antibodies to intermediate filament cytoskeletal proteins. Histopathology 1987. link 13 Balduin R, Drigo R, Schiraldi C, Carraro R. Ante mortem diagnosis of primary leiomyosarcoma of the pulmonary artery. Respiration; international review of thoracic diseases 1986. link 14 Ferguson EF, Anderson AW. Leiomyosarcoma of the rectum. Southern medical journal 1986. link 15 Tomaszewski MM, Kuenster JT, Hartman K. Leiomyosarcoma of ligamentum teres of liver: case report. Pediatric pathology 1986. link 16 Baldi F. Leiomyosarcoma of the small bowel. Tumori 1985. link 17 Ng WD, Chan KW, Chan YT. Primary leiomyosarcoma of renal capsule. The Journal of urology 1985. link49245-7) 18 Nielsen BB. Leiomyosarcoma of the breast with late dissemination. Virchows Archiv. A, Pathological anatomy and histopathology 1984. link 19 Gobardhan AB. Primary leiomyosarcoma of the breast. The Netherlands journal of surgery 1984. link 20 Pain JA, Sayer RE. Primary leiomyosarcoma of the pulmonary artery. European journal of respiratory diseases 1984. link 21 Gislason T, Arnarson OO. Primary ureteral leiomyosarcoma. Scandinavian journal of urology and nephrology 1984. link 22 Wojno T, Tenzel RR, Nadji M. Orbital leiomyosarcoma. Archives of ophthalmology (Chicago, Ill. : 1960) 1983. link 23 McDonald MW, O'Connell JR, Manning JT, Benjamin RS. Leiomyosarcoma of the penis. The Journal of urology 1983. link51464-0) 24 Weinreb W, Steinfeld A, Rodil J, Esparza A, Trebbin W. Leiomyosarcoma arising in an arteriovenous fistula. Cancer 1983. link52:2<390::aid-cncr2820520234>3.0.co;2-m) 25 Kawai T, Suzuki M, Mukai M, Hiroshima K, Shinmei M. Primary leiomyosarcoma of bone. An immunohistochemical and ultrastructural study. Archives of pathology & laboratory medicine 1983. link 26 Choi SH, Liu K. Leiomyosarcoma of the adrenal gland and its angiographic features: a case report. Journal of surgical oncology 1981. link 27 Blatt JM, Kopolovic J, Gimmon Z, Rabinovici N. Leiomyosarcoma of the rectum: diagnostic criteria and surgical approach. International surgery 1979. link 28 Jones PA. Leiomyosarcoma of the appendix: report of two cases. Diseases of the colon and rectum 1979. link 29 Watson LC, Mueller EO, Thompson JC. Leiomyosarcoma of the colon. Southern medical journal 1978. link 30 Nirmel KN, Aleksic S, Sidhu G, Emancipator S, Ransohoff J, Budzilovich GN. Leiomyosarcoma metastatic to the brain. Surgical neurology 1978. link 31 Martis C. Leiomyosarcoma of the maxilla: report of two cases. Journal of oral surgery (American Dental Association : 1965) 1978. link 32 Mehzad M. Leiomyosarcoma of the uterus presenting with pneumothorax. British journal of diseases of the chest 1977. link90095-x) 33 Wolfson P, Oh C. Leiomyosarcoma of the anus: report of a case. Diseases of the colon and rectum 1977. link 34 Poleksic S. Leiomyosarcoma of urinary bladder in von Recklinghausen's neurofibromatosis. Urology 1977. link90164-9) 35 Mindich B, Tykot H, Littman L, Levowitz S. Leiomyosarcoma of the rectum: report of a case. Diseases of the colon and rectum 1975. link 36 Gross E, Horton MA. Leiomyosarcoma of the saphenous vein. The Journal of pathology 1975. link

Leiomyosarcoma