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Click 29 year old male with myositis ossificans of the quadratus lumborum muscle.
Protocol: Non-contrast enhanced CT, Siemens Somatom. Images were acquired kVp 120, mAs 51, helical acquisition, pitch 0.8, the original image collimation was 1.2 mm, the final images were reformatted to 5 mm thickness.
Findings:
1. A focus of mature bone in the quadratus lumborum muscle. Reformatted CT images revealed a mass measuring 10 cm x 3.2 cm (craniocaudal by transverse) arising from the left iliac crest, extending obliquely superiormedially towards the left L3 transverse process. There were small corticated calcifications seen between the mass and the L3 transverse process
2. A dense 5 mm diameter calcification in the cranial end of the left kidney at the corticomedullary junction. There was no evidence of hydronephrosis, perinephric stranding or perinephric edema and the left kidney was not enlarged. The upper left ureter was mildly dilated with a dense 3 mm diameter calcification in the distal left ureter, consistent with mild hydroureter. This calcification was located approximately 8 cm cranial to the ureterovesicular junction. The calcifications were consistent with collecting system calculi.


Click 29 year old male with myositis ossificans of the quadratus lumborum muscle.
Coronal reformatted CT images in bone window. The images are sequentially numbered with number 1 being ventral and the last image being dorsal.

Protocol: Non-contrast enhanced CT, Siemens Somatom. Images were acquired kVp 120, mAs 51, helical acquisition, pitch 0.8, the original image collimation was 1.2 mm, the final images were reformatted to 5 mm thickness.
Findings:
1. A focus of mature bone in the quadratus lumborum muscle. Reformatted CT images revealed a mass measuring 10 cm x 3.2 cm (craniocaudal by transverse) arising from the left iliac crest, extending obliquely superiormedially towards the left L3 transverse process. There were small corticated calcifications seen between the mass and the L3 transverse process
2. A dense 5 mm diameter calcification in the cranial end of the left kidney at the corticomedullary junction. There was no evidence of hydronephrosis, perinephric stranding or perinephric edema and the left kidney was not enlarged. The upper left ureter was mildly dilated with a dense 3 mm diameter calcification in the distal left ureter, consistent with mild hydroureter. This calcification was located approximately 8 cm cranial to the ureterovesicular junction. The calcifications were consistent with collecting system calculi.