Three patients are presented who sustained a lesion of iliopsoas muscle belly accompanied by intramuscular haematoma. Diagnosis was stated by means of CT scans. The accident such as fall of the stairs was the cause of the lesion in only two patients. The clinical manifestation of the illness significantly differed in symptoms such as: presence of subcutaneous haematomas, muscle tension, extent of pain, a drop of hemoglobin serum - level and others. The common feature of this mutilation was the maximal localization of the pain at the groin region of the affected side, difficulties in thigh dorsiflexion and external rotation as well as subsiding of symptoms after short-term conservative treatment. The characteristic of this rarely-diagnosed mutilation was analyzed on the basis of medical literature.