Bone scintigraphy in acromegaly. Preliminary report on 10 cases

Area of Science:

• Endocrinology
• Nuclear Medicine
• Orthopedics

Background:

• Acromegaly is a condition caused by excess growth hormone, leading to skeletal changes.
• Bone scintigraphy is a nuclear medicine imaging technique that assesses bone metabolic activity.

Purpose of the Study:

• To evaluate bone scintigraphy as a diagnostic and prognostic tool for acromegaly.
• To compare bone isotope uptake in acromegalic patients versus healthy controls.

Main Methods:

• Bone scintigraphy with 99m Tc-diphosphonate was performed on 10 acromegalic and 12 control patients.
• Isotope uptake was measured in specific bone areas (cranium, hands) 3-4 hours post-injection.
• Data was analyzed for significant differences between groups and within acromegalic subgroups (active vs. inactive).

Main Results:

• Acromegalic patients showed significantly higher bone isotope uptake in parietal, occipital, temporal, nasal, frontal, and metacarpal areas compared to controls (p < 0.001 or p < 0.05).
• Surprisingly, no significant differences in mandibular bone isotope uptake were observed between acromegalics and controls.
• No significant differences in bone isotope uptake were found between active and inactive acromegalic patients across all assessed areas.

Conclusions:

• Bone scintigraphy is not a useful index for assessing acromegaly disease activity.
• Acromegalic bone exhibits similar metabolic activity regardless of disease status.
• The unchanged mandibular isotope uptake in acromegalics with prognathism warrants further investigation into bone metabolism.