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WHO Classification of Tumours
Leiomyoma, NOS
Kidney


Definition

Leiomyoma is a well-circumscribed, benign smooth muscle neoplasm histologically characterized by the presence of spindle cells with cigar-shaped nuclei, interlacing fascicles, and a whorled pattern
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Fletcher CDM, Unni KK, Mertens F (Eds.)
World Health Organization Classification of Tumours. Pathology and Genetics of Tumours of Soft Tissue and Bone.
3rd Edition
IARC Press: Lyon 2002



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Renal leiomyomas commonly arise from the renal capsule, but also from the muscularis of the renal pelvis or from cortical vascular smooth muscle. The tumours are firm, solid, and usually small. Most are incidentally discovered at autopsy

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Eble JE, Sauter G, Epstein JI, Sesterhenn IA (Eds.)
World Health Organization Classification of Tumours. Pathology and Genetics of Tumours of the Urinary System and Male Genital Organs.
3rd Edition
IARC Press: Lyon 2004



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