01 September 2026
: Case report 
Anterior Cutaneous Nerve Entrapment Syndrome in a 51-Year-Old Woman With Advanced Colon Cancer, Successfully Treated With Repeated Ultrasound-Guided Rectus Sheath Blocks: A Case Report
Challenging differential diagnosis, Unusual setting of medical care
Yoko Shimamoto-Nagahira ABCDE 1*, Ryuichi Nakanuno ABCD 1DOI: 10.12659/AJCR.953662
Am J Case Rep 2026; 27:e953662
Table 1 Analgesia duration during repeated rectus sheath blocks and rescue with intravenous morphine administration.
| Date | Rectus sheath block No. | Analgesic duration | Rescue IV morphine (mg/day) |
|---|---|---|---|
| Initial consultation | 700 | ||
| Day 1 | No. 1 | 8 hours | 260 |
| Day 2 | No. 2 | 8 hours | 175 |
| Day 3 | No. 3 | 12 hours | 0 |
| Day 6 | No. 4 | 12 hours | 87.5 |
| Day 7 | No. 5 | Over 24 hours | 87.5 |
| Day 8 | No. 6 | Over 24 hours | 35.0 |
| Day 9 | No. 7 | Over 24 hours | 0 |
| Day 10 | No. 8 | Over 5 days | 0 |
| Day 15 | No. 9 | Over 2 months | 0 |
| Day 1 indicates the day of the first rectus sheath block administration. Block No. indicates the sequence of the rectus sheath blocks. The analgesic duration refers to the period during which effective pain relief was maintained after administration of each of the 9 blocks. Rescue IV morphine refers to the total daily dose of intravenous morphine administered for breakthrough pain. | |||