Primary Intramuscular Hydatid Cyst Hydatid Disease (Echinococcosis)RPHC-DeltoidNCT07176598
Rare Case of Misdiagnosed Primary Intramuscular Hydatid Cyst of the Deltoid Muscle
An observational study of Primary Intramuscular Hydatid Cyst Hydatid Disease (Echinococcosis), run by Al-Shahba Specialized Hospital at 1 site in Syria.
Trial summary
This case report describes a rare parasitic cyst called a hydatid cyst located in the shoulder muscle (deltoid) of a 29-year-old male. The patient initially presented with a painless, gradually enlarging swelling over the left shoulder. Read more about this study
- Who is it for?
- Ages 18 to 120 years, men only
- Conditions the study is for
- Primary Intramuscular Hydatid Cyst Hydatid Disease (Echinococcosis)
- How many people
- 1 participants
- Where
- 1 siteSyria
- Study dates
- 1 Jun 2024to 25 Aug 2025
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 120 years
- Men only
- No healthy volunteers
- Adult, Older adult
Study population: A single 29-year-old male patient diagnosed with primary intramuscular hydatid cyst of the deltoid muscle. The patient underwent surgical excision and postoperative albendazole therapy.
Who may be able to join
- Male patient Age 18 years or older Diagnosed with primary intramuscular hydatid cyst of the deltoid muscle
Who cannot join
- Patients with cysts in other organs (liver, lungs) Patients with systemic infection or immunocompromised status Patients who did not undergo surgical excision
- -
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Case Report: Misdiagnosed Primary Intramuscular Hydatid Cyst of the Deltoid Muscle in a Male Patient
This case report describes a rare parasitic cyst called a hydatid cyst located in the shoulder muscle (deltoid) of a 29-year-old male. The patient initially presented with a painless, gradually enlarging swelling over the left shoulder. It was misdiagnosed as a synovial cyst and treated with corticosteroids, which caused local inflammation and purulent discharge. Blood tests for Echinococcus antibodies were negative. Ultrasound and MRI revealed a well-defined intramuscular cyst confined to the deltoid muscle. Surgical excision confirmed the diagnosis, and the patient received postoperative albendazole therapy for three months. Follow-up showed complete healing, restoration of shoulder function, and no recurrence. This case highlights the importance of considering hydatid disease in unusual muscle locations, particularly in endemic areas, to avoid misdiagnosis and ensure proper treatment.
Read the detailed description
This report presents a rare case of a primary intramuscular hydatid cyst confined to the deltoid muscle in a 29-year-old male. The patient had a seven-month history of a gradually enlarging swelling in the left shoulder. Initially misdiagnosed as a synovial cyst, he received corticosteroid injection, which led to pain, erythema, and purulent discharge. Physical examination revealed a 10 cm fluctuant mass over the posterolateral deltoid. Serology for Echinococcus antibodies was negative. Ultrasound showed a well-defined, anechoic intramuscular cyst measuring 7 × 8 × 10 cm. MRI confirmed a fluid-filled cyst confined to the deltoid muscle, without involvement of bone, tendon, or joint structures. Under local anesthesia, the cyst was completely excised, and the cavity was irrigated with 10% povidone-iodine. Histopathology confirmed a non-fertile hydatid cyst (Echinococcus granulosus) without malignancy. Postoperative therapy included albendazole 400 mg daily for three months. Follow-up at six weeks showed complete wound healing, full shoulder function, and no recurrence. This case underscores the diagnostic challenges of intramuscular hydatid cysts, especially with negative serology, and highlights the importance of imaging, histopathology, and careful surgical management in endemic regions.
- Medical subject headings
- Echinococcosis
What is being measured
The primary outcome is the main question the study is designed to answer.
Complete recovery of shoulder function without recurrence
Monitoring for surgical site infection, serological status, and general patient well-being following treatment.
Measured: 6 weeks postoperatively
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted16 Sep 2025
- Study start1 Jun 2024
- Primary completion22 Aug 2025
- Study completion25 Aug 2025
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Primary Intramuscular Hydatid Cyst Hydatid Disease (Echinococcosis)Studies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Case only
- Time perspective
- Retrospective
- Enrolment
- 1 participants (actual)
Sponsor and investigators
- Lead sponsor
- Al-Shahba Specialized Hospital
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Mohanad Nasani, Al-Shahba Specialized Hospital
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07176598
- Sponsor's protocol ID
- RC-Hydatid-2025-001
- Acronym
- RPHC-Deltoid
- Status last verified
- Sep 2025
- First submitted
- 10 Sep 2025
- Last updated
- 16 Sep 2025
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Study at a glance
From the registry record, last updated by the sponsor on 16 Sep 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Case Report: Misdiagnosed Primary Intramuscular Hydatid Cyst of the Deltoid Muscle in a Male Patient
- ClinicalTrials.gov ID
- NCT07176598
- Acronym / sponsor ID
- RPHC-Deltoid / RC-Hydatid-2025-001
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 1 participants (actual)
- Lead sponsor
- Al-Shahba Specialized HospitalUniversity, hospital or other
- Study start
- 1 Jun 2024 (actual)
- Primary completion
- 22 Aug 2025 (actual)
- Study completion
- 25 Aug 2025 (actual)
- First posted
- 16 Sep 2025 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This case report describes a rare parasitic cyst called a hydatid cyst located in the shoulder muscle (deltoid) of a 29-year-old male. The patient initially presented with a painless, gradually enlarging swelling over the left shoulder. It was misdiagnosed as a synovial cyst and treated with corticosteroids, which caused local inflammation and purulent discharge. Blood tests for Echinococcus antibodies were negative. Ultrasound and MRI revealed a well-defined intramuscular cyst confined to the deltoid muscle. Surgical excision confirmed the diagnosis, and the patient received postoperative albendazole therapy for three months. Follow-up showed complete healing, restoration of shoulder function, and no recurrence. This case highlights the importance of considering hydatid disease in unusual muscle locations, particularly in endemic areas, to avoid misdiagnosis and ensure proper treatment.
Detailed description
This report presents a rare case of a primary intramuscular hydatid cyst confined to the deltoid muscle in a 29-year-old male. The patient had a seven-month history of a gradually enlarging swelling in the left shoulder. Initially misdiagnosed as a synovial cyst, he received corticosteroid injection, which led to pain, erythema, and purulent discharge. Physical examination revealed a 10 cm fluctuant mass over the posterolateral deltoid. Serology for Echinococcus antibodies was negative. Ultrasound showed a well-defined, anechoic intramuscular cyst measuring 7 × 8 × 10 cm. MRI confirmed a fluid-filled cyst confined to the deltoid muscle, without involvement of bone, tendon, or joint structures. Under local anesthesia, the cyst was completely excised, and the cavity was irrigated with 10% povidone-iodine. Histopathology confirmed a non-fertile hydatid cyst (Echinococcus granulosus) without malignancy. Postoperative therapy included albendazole 400 mg daily for three months. Follow-up at six weeks showed complete wound healing, full shoulder function, and no recurrence. This case underscores the diagnostic challenges of intramuscular hydatid cysts, especially with negative serology, and highlights the importance of imaging, histopathology, and careful surgical management in endemic regions.
Study design
- Observational model
- Case only
- Time perspective
- Retrospective
Who may qualify
- Ages
- 18 to 120 years
- Sex
- Male only
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- A single 29-year-old male patient diagnosed with primary intramuscular hydatid cyst of the deltoid muscle. The patient underwent surgical excision and postoperative albendazole therapy.
Key inclusion criteria (1 listed)
- Male patient Age 18 years or older Diagnosed with primary intramuscular hydatid cyst of the deltoid muscle
Key exclusion criteria (2 listed)
- Patients with cysts in other organs (liver, lungs) Patients with systemic infection or immunocompromised status Patients who did not undergo surgical excision
- -
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Complete recovery of shoulder function without recurrence
Time frame: 6 weeks postoperatively
Monitoring for surgical site infection, serological status, and general patient well-being following treatment.
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 16 Sep 2025.
Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Primary Intramuscular Hydatid Cyst Hydatid Disease (Echinococcosis), run by Al-Shahba Specialized Hospital at 1 site in Syria.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 1 inclusion and 2 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 16 Sep 2025. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Syria. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Complete recovery of shoulder function without recurrence (time frame: 6 weeks postoperatively). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 16 Sep 2025.