GIST Specialist for Pacific Palisades, CA
Gastrointestinal stromal tumors are almost never an emergency, which makes the exceptions worth recognising. Obstruction and perforation need the same day, not next week. Joshua Ellenhorn, MD, FACS handles both, and the planning that should follow them.
- Clear guidance on what genuinely cannot wait
- Clinical Professor of Surgery, Cedars-Sinai Medical Center
- Takes over care after emergency surgery performed elsewhere
- Twenty five to thirty five minutes east along Sunset

Two Presentations That Change the Timeline
Most of what is written about gastrointestinal stromal tumors, including most of this site, is about taking time. Getting the pathology complete, obtaining mutation testing, correcting anemia, considering whether medication should precede surgery. That is correct for the great majority of patients.
Two presentations break that pattern. The first is obstruction. Because GIST grows outward from the bowel wall rather than into the passage, it usually displaces rather than blocks, which is why obstruction is uncommon. When it does happen it is generally a small bowel or duodenal tumor, either narrowing the passage directly or acting as a lead point that drags one segment of bowel inside the next. The symptoms are unmistakable: severe cramping pain in waves, a swollen abdomen, vomiting, and nothing passing.
The second is perforation. A large tumor can outgrow its own blood supply, the tissue in the centre breaks down, and eventually the wall gives way. Bowel contents enter the abdominal cavity and the patient becomes rapidly and severely unwell. This is a same day surgical emergency and there is no version of it that waits for an outpatient appointment.
Both matter beyond the immediate crisis. An emergency operation is designed to control a catastrophe, not to remove a cancer under ideal conditions, and perforation means the tumor has effectively ruptured. Which is why what happens in the weeks after is as important as what happens on the night.

What Warrants the Emergency Department, and What Does Not
This is not a substitute for clinical judgement, and if you are unsure, err toward being seen. But the distinction is usually clear.
| Symptom | What it may indicate | Where to go |
|---|---|---|
| Severe pain in waves, distension, vomiting, nothing passing | Bowel obstruction or intussusception | Emergency department, same day |
| Sudden severe constant pain with fever and a rigid abdomen | Perforation | Emergency department immediately |
| Vomiting blood, or black tarry stools with light headedness | Brisk bleeding from the tumor | Emergency department, same day |
| Fatigue and breathlessness with a low blood count | Slow chronic bleeding | Clinic within days to weeks. Not an emergency, but not to be left for months |
| Dull ache, early fullness, bloating | A tumor pressing on adjacent structures | Clinic appointment. Time to plan properly |
| A mass found incidentally on a scan, no symptoms | The commonest presentation | Clinic appointment. There is time to do this well |
The bottom three rows describe the overwhelming majority of GIST presentations. The top three are uncommon, and confusing the two categories leads either to unnecessary panic or to a genuine emergency being underestimated.

What Should Happen in the Weeks That Follow
Emergency surgery for a perforated or obstructing GIST is a different exercise from planned cancer surgery. The surgeon on that night is managing sepsis, contamination and an unstable patient, and the priority is correctly to get the patient through it. Oncological refinement is not the objective and should not be expected.
That leaves work to be done afterwards, and it is frequently not done. The specimen needs full pathology including the mitotic index. Mutation testing needs ordering, because it determines whether adjuvant therapy will work. Staging imaging needs completing once the patient has recovered enough for it to be meaningful. And the risk category needs recalculating with perforation factored in, which almost always places the tumor in the high risk band regardless of its size.
The practical consequence is usually longer adjuvant therapy than a standard three year course, and closer surveillance focused on the peritoneal surfaces where spilled cells settle. None of that follows automatically from an emergency admission, and patients discharged from a surgical ward after a successful rescue are frequently never given a cancer plan at all.
How Urgency Changes the Approach
The same tumor is treated differently depending on how it presents.
Control First, Plan Later
Perforation or complete obstruction. Surgery addresses the crisis, and the cancer planning happens once you are stable. Expect the risk category to be recalculated and adjuvant therapy to be discussed on different terms.
Days, Not Months
Significant bleeding requiring transfusion, or partial obstruction. There is usually time to stabilise, correct the blood count and stage properly, which produces a considerably better designed operation.
Use the Time
The great majority. Complete pathology, mutation testing, anemia correction, and consideration of whether medication before surgery would make the operation smaller. This is where the best outcomes come from.
What a Planned Operation Looks Like
Recordings of real GIST resections narrated by the surgeon who performed them. The contrast with emergency surgery is the point: this is what is achievable when there is time to plan.
Laparoscopic Resection of a Gastric GIST
A gastric GIST removed through small incisions with the capsule kept intact.
Gastric GIST Resection: A Simplified Approach
A refined approach that shortens operating time and recovery.
Robotic Resection of a Duodenal GIST
Duodenal GIST removed robotically with the pancreas and bile duct preserved.
Ask for a Cancer Plan
Surviving a perforation is not the same as having your GIST treated. Complete pathology, mutation testing, a recalculated risk category and a surveillance schedule should all follow, and frequently do not.
Certifications and Appointments
Two American Board of Surgery certifications, a Cedars-Sinai teaching appointment, and membership of the societies that set the standards for this disease.





- American Board of Surgery, certified in General Surgery
- American Board of Surgery, certified in Colorectal Surgery
- California State Medical License
- Florida State Medical License
Joshua Ellenhorn, MD, FACS
Dr. Ellenhorn is a surgical oncologist and Clinical Professor of Surgery at Cedars-Sinai Medical Center, and a collaborative member of the Samuel Oschin Comprehensive Cancer Institute.
Patients who arrive after an emergency operation form a recognisable group in this practice. They have usually been well looked after in the acute sense and then discharged into a gap, with a histology report nobody has interpreted and no plan for what comes next. Picking that up is unglamorous work: obtaining the outside operative report, establishing whether the tumor was perforated or ruptured, getting the mutation testing ordered belatedly. It is also where a great deal of avoidable recurrence is prevented.
He is certified by the American Board of Surgery in General Surgery and in Colorectal Surgery, a Fellow of the American College of Surgeons, and a member of the Society of Surgical Oncology and the American Society of Clinical Oncology. He practises with the Surgery Group of Los Angeles.

What Patients Say
Reviews left by patients treated by Dr. Ellenhorn at the Surgery Group of Los Angeles.
★★★★★The staff at the Surgery Group of Los Angeles are wonderful. They are kind, very attentive, the office is clean and I did not have to wait long at all. I cannot say enough great things about Dr. Ellenhorn. He is an excellent surgeon who is highly skilled and very knowledgeable. I cannot thank him enough for all he has done for my family and I.
Erika Frank
★★★★★I was very pleased with the office staff, they were always very pleasant and helpful. I was very impressed with Dr. Ellenhorn as well. He was very friendly and addressed all my concerns regarding my surgery and aftercare and follow up.
Terry Jackson
East Along Sunset
Sunset Boulevard east through Brentwood and Beverly Hills, then south on Doheny or La Cienega to 3rd Street, is the direct route from Pacific Palisades. Pacific Coast Highway down to the 10 and north is the alternative and is quicker off peak, though Sunset tends to hold steadier in the afternoon. Twenty five to thirty five minutes depending on the hour.
The office is in the medical plaza attached to Cedars-Sinai Medical Center, which has a full emergency department and intensive care in the same institution. For the presentations described on this page that is the relevant point: a patient who deteriorates is not being transferred between facilities.
Patients travelling from outside the region, including Arizona and Nevada, can have imaging and pathology reviewed remotely.
8635 W 3rd St, Suite 880W
Los Angeles, CA 90048
Monday to Saturday, 11:00am to 8:00pm
Closed Sunday
Frequently Asked Questions
What symptoms mean I should go to an emergency department rather than wait?
Can a GIST block the bowel?
What is intussusception?
Can a GIST perforate?
Does emergency surgery affect my long term outcome?
What should happen after emergency surgery?
How far is your office from Pacific Palisades?
If I had emergency surgery elsewhere, can you take over?
Know Which Symptoms Cannot Wait.
Severe pain with distension and vomiting, or sudden constant pain with fever, needs an emergency department the same day. Almost everything else about a GIST is better handled with time to plan.