A 25 year old man presented in 2019 with increasing pain, coldness of left lower limb and lump at left popliteal fossa. Magnetic resonance imaging was performed before surgery and histopathological and immunohistochemical studies were performed after surgery. This demonstrated a 8x6x2 cm well defined soft tissue mass at the posterior compartment of knee engulfing tendons. A histopathologi¬cal differential diagnosis of benign spindle cell lesion leiomyoma and benign fibrous tumour was made. We describe this rare case of fibroma at posterior compartment of the knee with immunohistochemistry and treatment.