Ultrasound has come back as normal.
brief copy of report as follows
Both kidneys apprear normal in size, shape and echo-texture . right kidney 101mm, left kidney 102 mm. No evidence of hydronephrosis, renal calculi or focal lesion seen.
Bladder no obvious focal lesion identified
No abnormalities seen in the liver, aorta or gallbladder.. Normal size spleen No obvious abnormality in the head or body of pancreas .
Since upped dose of Nitrofurantoin symptoms seem to have subsided with cystitis
wait now to see if further investigation is needed.