HemoChat is an evidence-based AI medical search tool covering all major clinical domains, powered by 46,298 SNOMED-CT concepts, clinical guidelines, and live PubMed literature.

What medical domains does HemoChat cover?

HemoChat covers all major medical domains including cardiology, oncology, neurology, hematology, pulmonology, endocrinology, gastroenterology, psychiatry, nephrology, rheumatology, musculoskeletal, and more — with 46,298 SNOMED-CT concepts.

Is HemoChat a replacement for clinical judgment?

No. HemoChat is for clinical reference only and is not a substitute for professional medical judgment. Always consult qualified healthcare professionals for medical decisions.

What AI technology does HemoChat use?

HemoChat uses a hybrid GraphRAG + VectorRAG pipeline combining Neo4j knowledge graphs with FAISS vector search and an LLM for answer generation.

Goiter — Clinical Guidelines

Overview

Goiter refers to the abnormal enlargement of the thyroid gland, which can be classified as substernal (involving the mediastinum) or retrosternal (extending behind the sternum). It often results from iodine deficiency but can also be associated with other etiologies such as autoimmune disorders or multinodular hyperplasia 1 18.

Diagnosis

Clinical Examination: Palpation of the neck to assess size and location of the goiter 1 8.

Imaging: Ultrasound, CT, or MRI to evaluate the extent and intrathoracic involvement 1 7 19.

Thyroid Function Tests: To assess for hypothyroidism or hyperthyroidism 2 11.

Grading: Classification systems like the WHO classification for goiter size (Grade 0-4) 11.

Management

Medical Management:

- Thyroid Hormone Therapy: Not routinely recommended for simple goiters unless symptomatic or growing 2.

Surgical Management:

- Conventional Thyroidectomy: For smaller goiters 8. - Sternotomy: Indicated for large substernal goiters requiring extensive resection 1 12.

Endoscopic and Minimally Invasive Approaches: For selected cases to reduce complications 19.

Special Populations

Pregnancy: Airway management with awake fiberoptic intubation followed by combined caesarean section and thyroidectomy if airway obstruction occurs 16.

Elderly: Increased risk of complications; careful preoperative assessment and multidisciplinary planning recommended 1 7.

Comorbidities: Consideration of additional surgical risks, such as tracheal varices or superior vena cava syndrome 9 28.

Key Recommendations

Preoperative imaging is essential to predict the need for sternotomy in substernal goiter patients to optimize surgical planning (Evidence: Moderate 1).

Thyroid hormone therapy is generally discouraged for euthyroid patients with simple goiters unless there are specific indications like growth or symptoms (Evidence: Strong 2).

In cases of intrathoracic goiter causing severe tracheal stenosis, emergency airway management may require endotracheal intubation with preparation for sternotomy (Evidence: Weak 7).

Multidisciplinary care is advised for elderly patients with goiter to manage increased surgical risks effectively (Evidence: Expert opinion 7).

Pregnant patients with airway obstruction due to goiter should be managed with awake fiberoptic intubation followed by urgent surgical intervention (Evidence: Moderate 16).

References

1 Alqutub AT, Alqutub AT, Alqutub AT, Alqutub HT, Alqutub TT, Alqutub ST et al.. Predictors of Sternotomy in Substernal Goiter Patients: A Systematic Review and Meta-Analysis. The Journal of surgical research 2025. link 2 Papini E, Attanasio R, Žarković M, Nagy EV, Negro R, Perros P et al.. Thyroid hormones for euthyroid patients with simple goiter growing over time: a survey of European thyroid specialists. Endocrine 2025. link 3 Dionigi G, Dionigi R. Goiter in a Fresco by Giovanni Luigi Valesio (1611, Church of Saints Eusebio and Vittore, Peglio, Como). Journal of endocrinological investigation 2022. link 4 Dionigi G, Dionigi R. Goiter in a fresco by simone peterzano, master of caravaggio (1578-1582, Garegnano Charterhouse, Milan). Journal of endocrinological investigation 2022. link 5 Dionigi G, Dionigi R. Goiter in a fresco by i Fiammenghini, 1615 (Abbey of Santa Maria di Rovegnano, Chiaravalle, Italy). Journal of endocrinological investigation 2022. link 6 Accorona R, Calabrese L. African statue with goiter. Journal of endocrinological investigation 2019. link 7 Shiikawa M, Hayasaka K, Yarimizu K, Suzuki K, Endo M, Yanagawa N et al.. [Giant Intrathoracic Goiter Requiring Emergency Airway Management;Report of a Case]. Kyobu geka. The Japanese journal of thoracic surgery 2018. link 8 Tobohov A, Nikolaev V. SURGICAL TREATMENT OF NECK AND RETROSTERNAL GOITER, CLINICAL CASE. Wiadomosci lekarskie (Warsaw, Poland : 1960) 2015. link 9 Lucchini R, Santoprete S, Triola R, Polistena A, Monacelli M, Avenia S et al.. Tracheal varices caused by mediastinal compression of a large intrathoracic goiter: report of a case. Il Giornale di chirurgia 2015. link 10 Hasanin A, Sherif N, Elbarbary M, Mansor D. Providing medical care in unfamiliar settings; experience of an Egyptian campaign in Uganda. The Pan African medical journal 2014. link 11 Caron P, Lehert P, Picard S, Landron F. The DIAGONALE study: a survey designed to analyze the diagnosis and management of goiter in France. Annales d'endocrinologie 2012. link 12 Burns P, Doody J, Timon C. Sternotomy for substernal goitre: an otolaryngologist's perspective. The Journal of laryngology and otology 2008. link 13 Siavash M, Hashemipour M, Keshteli AH, Amini M, Aminorroaya A, Rezvanian H et al.. Endemic goiter in Semirom; there is no difference in vitamin A status between goitrous and nongoitrous children. Journal of nutritional science and vitaminology 2008. link 14 van der Veldt AA, Hadithi M, Paul MA, van den Berg FG, Mulder CJ, Craanen ME. An unusual cause of hematemesis: Goiter. World journal of gastroenterology 2006. link 15 Bhagat MC, Dhaliwal SS, Bonnema SJ, Hegedüs L, Walsh JP. Differences between endocrine surgeons and endocrinologists in the management of non-toxic multinodular goitre. The British journal of surgery 2003. link 16 Reid AW, Warmington AD, Wilkinson LM. Management of a pregnant patient with airway obstruction secondary to goitre. Anaesthesia and intensive care 1999. link 17 Martin-Hirsch DP, Lannigan FJ. The management of benign thyroid goitre causing tracheo-oesophageal embarrassment. The Journal of laryngology and otology 1995. link 18 Tebeb HN. Goiter problems in Ethiopia. The American journal of clinical nutrition 1993. link 19 Landreneau RJ, Nawarawong W, Boley TM, Johnson JA, Curtis JJ. Intrathoracic goiter: approaching the posterior mediastinal mass. The Annals of thoracic surgery 1991. link91436-y) 20 Alosco T, Eisenberg B, Keller SM. Retrotracheal goiter. Southern medical journal 1990. link 21 Sasipreeyajan J, Newman JA. Goiter in a cockatiel (Nymphicus hollandicus). Avian diseases 1988. link 22 Giampalmo A, Fulcheri E. An investigation of endemic goitre during the centuries in sacral figurative arts. Zentralblatt fur allgemeine Pathologie u. pathologische Anatomie 1988. link 23 Olea Serrano MR, Ruiz Lopez MD, Justica Palomares H. Determination of SCN--in vegetables by gas chromatography in relation to endemic goiter. Journal of analytical toxicology 1988. link 24 Lagler U, Russi E. Upper airway obstruction as a cause of pulmonary edema during late pregnancy. American journal of obstetrics and gynecology 1987. link90068-8) 25 Fernandez-Cruz L, Serra-Batlles J, Picado C. Retrosternal goiter and chylothorax: case report. Respiration; international review of thoracic diseases 1986. link 26 Sacre R. A new instrument: the goiter extractor. Head & neck surgery 1984. link 27 Komolafe F. Air esophagogram: a frequent observation in goiters. Diagnostic imaging in clinical medicine 1984. link 28 Steenerson RL, Barton RT. Mediastinal goiter and superior vena cava syndrome. The Laryngoscope 1978. link 29 Bestetti G. Diffuse congenital goitre of the thyroid in the kid. Folia veterinaria Latina 1975. link 30 Malone JF, Cullen MJ. A thermoluminescent method for estimation of effective thyroidal half-life of therapeutic 131I in toxic goitre. The British journal of radiology 1975. link 31 Holden MP, Wooler GH, Ionescu MI. Massive retrosternal goitre presenting with hypertension. Thorax 1972. link

Goiter