Ultrasonography Improves Glycemic Control by Detecting Insulin-Derived Localized Amyloidosis

We examined the feasibility of ultrasound diagnosis of insulin-derived localized amyloidosis (IDLA). In addition to ultrasound detectability and findings, the insulin absorption rate, insulin dosage and hemoglobin A1c (HbA1c) levels before and after shifting the insulin injection site were investigated for 22 cases of IDLA. The detectability of IDLA on ultrasound was 100%; 59.1% was palpable lumps and 40.9% was not palpable. The palpable type had lower echo intensity and were harder than the non-palpable type. Blood flow decreased in IDLA, especially in the palpable type. IDLA, especially the palpable type, had a low insulin absorption rate. HbA1c level and insulin dosage decreased after shifting the injection site. The palpable type had more insulin reduction than the non-palpable type. Characteristic ultrasound images of IDLA were acquired. As the non-palpable type could be identified by ultrasound, its diagnosis encourages changing the insulin injection site; hence, ultrasound diagnosis of IDLA can enhance insulin treatment.