What the Report Shows

Findings in Plain Language

1. A small subcutaneous fluid collection - approximately 4 x 1.7 x 3.1 mm in size, described as "hypoechoic" (dark on ultrasound, meaning it contains fluid). It sits just under the skin along the stitch line.
2. A sinus tract - a narrow channel (1.7 mm diameter) connecting that surface collection to a deeper tissue plane. This is the more significant finding.

What This Condition Is

• Suture reaction - the body reacts to the suture material (especially non-absorbable sutures), triggering a foreign body inflammatory response
• Stitch abscess - bacteria can colonize around a suture and cause a localized collection of pus or inflammatory fluid
• Seroma - sterile fluid (lymph/tissue fluid) collects in the dead space created by surgery
• Tract formation - the collection creates or tracks along a channel to the deeper tissues, which on this scan communicates to the "deeper plane"

• The subcutaneous tissue
• The fascia
• Potentially deeper structures of the wrist (tendons, joint space), which is why the radiologist has recommended MRI wrist for further evaluation

Why MRI Was Recommended

• How deep the tract actually goes (does it reach the wrist joint?)
• Whether it involves tendon sheaths (tenosynovitis)
• Whether there is any bone involvement (osteomyelitis)
• The exact extent and anatomy of the tract

Treatment Approach

1. Non-surgical (conservative) - for simple, superficial, uninfected seromas

• Needle aspiration (18G needle under ultrasound guidance) to drain the fluid collection
• Compression dressing after aspiration
• Repeat aspiration if it refills within 24-48 hours
• Monitor for signs of infection (redness, warmth, fever, pus)

2. Suture removal

• If a retained suture is the cause of the reaction (a "spitting suture" or stitch abscess), removing the offending suture often resolves the problem
• The wound may open slightly but usually heals with secondary intention

3. Antibiotics

• If there are signs of infection (fever, redness, discharge, raised white cell count), antibiotics covering Staphylococcus and Streptococcus species are started
• For simple cellulitis: oral antibiotics (e.g., co-amoxiclav or flucloxacillin)
• Culture-directed therapy if pus is drained

4. Surgical management - if conservative measures fail or MRI shows deep involvement

• Lay-open of the sinus tract - the tract is surgically opened along its length, debrided, and allowed to heal from the inside out (secondary intention)
• Excision of the sinus tract - the entire tract and surrounding unhealthy tissue is cut out
• If the wrist joint is involved, more extensive surgical irrigation and debridement may be needed
• Wound irrigation of the tract at dressing changes to prevent premature closure of the surface while the deep tissue heals

5. Wound care during healing

• Packing the wound with appropriate dressings (e.g., alginate ribbon, PICO negative pressure dressing) to ensure the tract heals from the bottom up, not just at the surface
• Regular dressing changes and monitoring for recurrence

Key Next Step

• Increasing pain, swelling, or redness spreading up the arm
• Fever or chills
• Pus or foul-smelling discharge from the wound
• Numbness or weakness in the hand/fingers (suggests nerve or tendon involvement)