Draft Fetal Anatomy, EFW, and Ratios Section Parsers

[VarenyaJ]

Summary

Draft three new ETL section parsers for extracting structured clinical data from prenatal ultrasound reports:

• Fetal Anatomy - Extracts normal/abnormal/not-visualized structures with HPO term extraction from anomaly descriptions
• Estimated Fetal Weight (EFW) - Extracts weight estimates with SGA/AGA/LGA growth classification
• Fetal Ratios - Extracts HC/AC, FL/BPD, FL/AC ratios with proportionality assessment

Changes

New Files

• src/prenatalppkt/etl/sections/fetal_anatomy.py
• src/prenatalppkt/etl/sections/estimated_fetal_weight.py
• src/prenatalppkt/etl/sections/fetal_ratios.py
• tests/etl/sections/test_fetal_anatomy.py
• tests/etl/sections/test_estimated_fetal_weight.py
• tests/etl/sections/test_fetal_ratios.py

Modified Files

• src/prenatalppkt/etl/sections/__init__.py - Added new exports

Goals

• HPO Integration: Fetal anatomy parser should extract HPO terms from anomaly descriptions using HpoExactConceptRecognizer
• Growth Classification: EFW parser should classify growth ranges, e.g. SGA (<10th %ile), AGA (10-90th), or LGA (>90th)
• Proportionality Assessment: Ratios parser should be able to help us identify nonstandard/asymmetric growth patterns in downstream analyses via ratios, e.g. HC/AC