Anatomy
2 questionsWhich nerve defect causes lagophthalmos?
Which nerve innervates the lateral rectus muscle?
FMGE 2024 - Anatomy FMGE Practice Questions and MCQs
Question 21: Which nerve defect causes lagophthalmos?
- A. 7th nerve (Correct Answer)
- B. 5th nerve
- C. 4th nerve
- D. 6th nerve
Explanation: ***7th nerve***- The **Facial nerve (CN VII)** is crucial for eyelid closure as it innervates the **orbicularis oculi** muscle, one of the muscles of facial expression.- Paralysis of the 7th nerve prevents the eye from closing fully, leading to the condition known as **lagophthalmos** and subsequent exposure keratopathy.*6th nerve*- The **Abducens nerve (CN VI)** innervates the **lateral rectus** muscle, which is responsible for abducting (moving outward) the eye.- A defect results in **esotropia** (inward turning of the eye) and horizontal diplopia, unrelated to eyelid function.*4th nerve*- The **Trochlear nerve (CN IV)** innervates the **superior oblique** muscle, assisting in depression and intorsion of the eye.- Defect typically causes characteristic vertical and torsional **diplopia**, often worse when looking down and in, and does not cause lagophthalmos.*5th nerve*- The **Trigeminal nerve (CN V)** is primarily the sensory nerve of the face, with the **ophthalmic division (V1)** providing sensation to the cornea.- While a V1 defect abolishes the **afferent limb of the corneal reflex** and can lead to neurotrophic keratopathy, it does not supply the motor function required for eyelid closure.
Question 22: Which nerve innervates the lateral rectus muscle?
- A. A. Sixth nerve (Correct Answer)
- B. B. Seventh nerve
- C. C. Third nerve
- D. D. Fourth nerve
Explanation: ***A. Sixth nerve***- Also known as the **abducens nerve**, the sixth cranial nerve is solely responsible for innervating the **lateral rectus muscle**.- The lateral rectus muscle's action is **abduction** (moving the eye laterally), which is why paralysis of the sixth nerve causes the eye to turn medially (**medial strabismus**) [1], [2].- *B. Seventh nerve*- The seventh cranial nerve (**facial nerve**) is primarily responsible for **facial expression muscles** and relays taste sensation from the anterior two-thirds of the tongue.- It has no role in the motor innervation of the **extraocular muscles**.- *C. Third nerve*- The third cranial nerve (**oculomotor nerve**) innervates most of the extraocular muscles, including the **superior, inferior, and medial recti**, and the **inferior oblique** [1].- Paralysis results in the classic **"down and out"** gaze due to the unopposed action of the abducens and trochlear nerves.- *D. Fourth nerve*- The fourth cranial nerve (**trochlear nerve**) innervates only the **superior oblique muscle** [1].- The action of the superior oblique muscle is primary **intorsion**, depression, and abduction.
Community Medicine
1 questionsHow does the World Health Organization (WHO) define blindness?
FMGE 2024 - Community Medicine FMGE Practice Questions and MCQs
Question 21: How does the World Health Organization (WHO) define blindness?
- A. VA < 6/60
- B. VA > 3/60
- C. VA < 3/60 (Correct Answer)
- D. VA > 6/60
Explanation: ***VA < 3/60*** - This visual acuity (VA) level in the better eye, with the best possible correction, meets the World Health Organization (WHO) definition of **blindness** (Visual Impairment Category 3 or worse). - It signifies that the patient cannot count fingers at a distance of 3 meters (CF < 3m), representing a profound loss of useful vision. *VA < 6/60* - A visual acuity of less than 6/60 but equal to or better than 3/60 is classified by the WHO as **severe visual impairment** (Category 2), not clinical blindness. - This means the patient can still appreciate the largest optotype on the Snellen chart, but their vision is severely compromised. *VA > 3/60* - Visual acuity *greater* than 3/60 (e.g., 6/60, 6/18) indicates better visual function and therefore does not satisfy the criteria for WHO **blindness**. - Depending on the exact VA, this level of vision may fall into the categories of **moderate** or **mild visual impairment**. *VA > 6/60* - Visual acuity greater than 6/60 (e.g., 6/12) is well above the threshold defined for both **severe visual impairment** and blindness. - An acuity of 6/60 is often the benchmark for severe impairment; vision better than this suggests residual useful vision.
Internal Medicine
4 questionsA 46-year-old male presents to the outpatient department with a history of lower back pain and painful urination. Upon investigation, he is found to have normocytic normochromic anemia and hypercalcemia. Serum protein electrophoresis reveals an M-spike in the gamma region. Which of the following tests is most appropriate to confirm the diagnosis of multiple myeloma?
A young woman presents with recurrent headaches, easy bruising, and episodes of visual blurring. Her platelet count is elevated, while her red blood cell (RBC) and white blood cell (WBC) counts are normal. What is the most likely diagnosis?
Which of the following is the diagnostic test for carcinoid tumors?
Which of the following microorganisms is likely responsible for causing bilateral infiltrates in an HIV-positive patient?
FMGE 2024 - Internal Medicine FMGE Practice Questions and MCQs
Question 21: A 46-year-old male presents to the outpatient department with a history of lower back pain and painful urination. Upon investigation, he is found to have normocytic normochromic anemia and hypercalcemia. Serum protein electrophoresis reveals an M-spike in the gamma region. Which of the following tests is most appropriate to confirm the diagnosis of multiple myeloma?
- A. Liver function test
- B. Urine albumin-to-creatinine ratio (UACR) test
- C. Bone marrow examination (Correct Answer)
- D. Bence Jones protein in urine
Explanation: ***Bone marrow examination*** - The **definitive confirmatory test** for multiple myeloma is bone marrow examination showing **≥10% clonal plasma cells** (or presence of plasmacytoma on biopsy) [1]. - According to **International Myeloma Working Group (IMWG) criteria**, diagnosis requires: (1) clonal bone marrow plasma cells ≥10% OR biopsy-proven plasmacytoma AND (2) evidence of end-organ damage (CRAB criteria: hypercalcemia, renal insufficiency, anemia, bone lesions) [1]. - This patient has M-spike (monoclonal protein), hypercalcemia, anemia, and bone pain—bone marrow biopsy **confirms the diagnosis** by demonstrating clonal plasma cell proliferation [2]. *Liver function test* - These tests primarily evaluate **hepatic function** (e.g., ALT, AST, bilirubin) and are not diagnostic for multiple myeloma. - While some secondary abnormalities may occur (e.g., elevated **LDH** or **ALP** if bone involvement is extensive), LFTs lack the required specificity for confirming the diagnosis. *Urine albumin-to-creatinine ratio (UACR) test* - UACR is primarily used to screen for **microalbuminuria** in conditions such as **diabetic nephropathy** or hypertensive kidney disease. - The proteinuria seen in multiple myeloma is due to excretion of **kappa or lambda light chains** (Bence Jones protein), not albumin, making UACR inappropriate for MM diagnosis. *Bence Jones protein in urine* - Detection of **monoclonal free light chains** (Bence Jones protein) in urine is a **supportive finding** present in 50-60% of MM cases [1]. - While clinically significant and part of the diagnostic workup, it is **not confirmatory by itself**—bone marrow examination remains the gold standard. - Modern detection uses **urine immunofixation electrophoresis** or serum free light chain assays.
Question 22: A young woman presents with recurrent headaches, easy bruising, and episodes of visual blurring. Her platelet count is elevated, while her red blood cell (RBC) and white blood cell (WBC) counts are normal. What is the most likely diagnosis?
- A. Essential Thrombocythemia (Correct Answer)
- B. Polycythemia Vera
- C. Chronic Myeloid Leukemia (CML)
- D. Acute Myeloid Leukemia (AML)
Explanation: ***Essential Thrombocythemia*** - This **myeloproliferative neoplasm (MPN)** is characterized by isolated, persistent elevation of the **platelet count** (thrombocytosis) with relatively normal RBC and WBC counts, fitting the clinical picture. - Symptoms like headaches, visual blurring, and bruising are common because the functionally abnormal platelets can cause both **microvascular thrombosis** and bleeding tendencies. *Polycythemia Vera* - PV is primarily defined by **erythrocytosis** (elevated RBC count or hematocrit), which is inconsistent with this patient's normal red blood cell count. - Although PV often causes thrombocytosis, the core diagnostic feature involves a panmyelosis dominated by excessive **RBC mass** leading to hyperviscosity symptoms. *Chronic Myeloid Leukemia (CML)* - CML is hallmarked by significant **leukocytosis** (elevated WBC count, especially neutrophils and their precursors) due to the **BCR-ABL fusion gene**. - The patient's normal WBC count makes CML an unlikely diagnosis. *Acute Myeloid Leukemia (AML)* - AML typically presents with signs of **bone marrow failure**, such as anemia, neutropenia, and thrombocytopenia (low platelets), indicating acute lack of mature blood cells. - The lab findings in AML usually show cytopenia or the presence of immature **myeloblasts**, not isolated thrombocytosis.
Question 23: Which of the following is the diagnostic test for carcinoid tumors?
- A. Serum chromogranin A
- B. Serum calcitonin levels
- C. Urinary 5-hydroxyindoleacetic acid (Correct Answer)
- D. 24-hour urinary catecholamines
Explanation: ***Urinary 5-hydroxyindoleacetic acid***- Carcinoid tumors actively produce **serotonin**, which is rapidly metabolized by **monoamine oxidase** into the inactive metabolite **5-hydroxyindoleacetic acid (5-HIAA)**.- A **24-hour urinary collection** for 5-HIAA is the most specific and confirms the functional diagnosis of **carcinoid syndrome** [1].*24-hour urinary catecholamines*- This test is primarily used for the diagnosis of **pheochromocytoma**, which secretes excess **norepinephrine** and **epinephrine**.- High levels of catecholamine metabolites, such as **metanephrines** and **vanillylmandelic acid (VMA)**, are diagnostic for pheochromocytoma, not carcinoid tumors, which primarily produce serotonin.*Serum calcitonin levels*- **Calcitonin** secretion is the key diagnostic and monitoring marker for **medullary thyroid carcinoma (MTC)**, a non-related neuroendocrine tumor originating from C-cells.- This marker is not specific or elevated in typical **carcinoid tumors** originating from the small bowel or lungs.*Serum chromogranin A*- **Chromogranin A (CgA)** is a general biomarker for **neuroendocrine tumors (NETs)** and is useful for screening and monitoring disease burden [2].- While sensitive for carcinoid tumors, it lacks the specificity of **5-HIAA** for diagnosing **carcinoid syndrome** and can be falsely elevated in conditions like PPI use or renal failure.
Question 24: Which of the following microorganisms is likely responsible for causing bilateral infiltrates in an HIV-positive patient?
- A. Pneumocystis Jirovecii (Correct Answer)
- B. Histoplasma
- C. Aspergillus
- D. Cryptococcus
Explanation: ***Pneumocystis Jirovecii***- **Pneumocystis Pneumonia (PCP)** is the most common AIDS-defining infection affecting the lungs, typically presenting with **diffuse, bilateral, perihilar interstitial infiltrates** in HIV patients [1]. - This infection is strongly associated with a **CD4 cell count below 200 cells/mm³** and often manifests clinically with gradual onset of dyspnea, fever, and a non-productive cough [1].*Cryptococcus*- Although *Cryptococcus neoformans* is a common opportunistic infection in HIV, it predominantly causes **meningitis** or **meningoencephalitis**. - Pulmonary involvement usually presents as **nodules** or localized consolidations, not the classic diffuse bilateral interstitial pattern seen with PCP.*Histoplasmosis*- *Histoplasma capsulatum* is an endemic pathogen (e.g., Ohio and Mississippi River Valleys) that typically causes **disseminated disease** in advanced HIV. - While pulmonary infection may occur, it often presents with **hilar/mediastinal lymphadenopathy** [2] or a miliary pattern, rather than isolated bilateral interstitial infiltrates.*Aspergillus*- **Invasive Aspergillosis** generally occurs in patients with profound and prolonged **neutropenia** (e.g., following chemotherapy or transplantation), which is less common in typical AIDS patients with low CD4 counts. - Pulmonary findings usually involve localized **cavities** or **nodules with a halo sign** (angioinvasive disease), contrasting with the diffuse bilateral infiltrates of PCP.
Microbiology
1 questionsA patient presents with a history of watery diarrhea and vomiting. The pathogen exhibited darting motility. Which is the best selective media for the involved pathogen?
FMGE 2024 - Microbiology FMGE Practice Questions and MCQs
Question 21: A patient presents with a history of watery diarrhea and vomiting. The pathogen exhibited darting motility. Which is the best selective media for the involved pathogen?
- A. Potassium Tellurite Agar
- B. Cetrimide agar
- C. TCBS (Correct Answer)
- D. Nutrient media
Explanation: ***Correct: TCBS*** - **Thiosulfate Citrate Bile Salts Sucrose (TCBS) agar** is the most widely used selective medium for isolating *Vibrio cholerae* and other *Vibrio* species from clinical and environmental samples - The clinical presentation of **watery diarrhea and vomiting** with **darting motility** is characteristic of *Vibrio cholerae* - *Vibrio cholerae* ferments **sucrose** in TCBS medium, producing **yellow colonies**, contrasting with the blue-green colonies of non-sucrose fermenters like *Vibrio parahaemolyticus* - The medium contains **bile salts** that inhibit most Gram-positive bacteria while allowing Vibrio species to grow *Incorrect: Nutrient media* - Nutrient media is a **general-purpose** medium that supports the growth of a wide variety of non-fastidious organisms, making it **non-selective** for *Vibrio* - It lacks the inhibitory agents (bile salts) and specific markers (sucrose) necessary for selective isolation and differentiation of *Vibrio* species *Incorrect: Cetrimide agar* - This medium is specifically selective for **Pseudomonas aeruginosa**, as cetrimide (a quaternary ammonium compound) inhibits the growth of most other bacteria - *Vibrio cholerae* would likely be inhibited or overgrown by other organisms on this medium, making it unsuitable for isolation *Incorrect: Potassium Tellurite Agar* - Potassium Tellurite Agar (McLeod's medium) is a selective medium primarily used for the isolation of **Corynebacterium diphtheriae** - The tellurite salt inhibits most other respiratory flora but does not specifically enhance or select for the growth of *Vibrio* species
Orthopaedics
1 questionsThe diagnosis in a patient who is unable to perform internal and external rotation of the hip is?
FMGE 2024 - Orthopaedics FMGE Practice Questions and MCQs
Question 21: The diagnosis in a patient who is unable to perform internal and external rotation of the hip is?
- A. Dislocation of hip (Correct Answer)
- B. Pelvis fracture
- C. Acetabular fractures
- D. Femur head fracture
Explanation: ***Dislocation of hip***- Inability to perform **internal and external rotation** (both active and passive) is a hallmark sign of a **dislocated joint**, indicating mechanical blockage due to the displacement of the **femoral head** from the acetabulum.- Hip dislocations (especially posterior) present with severe pain and a **fixed deformity** (usually internal rotation, adduction, and mild flexion), which mechanically prevents any rotary movement.*Femur head fracture*- While a **femur head fracture** causes severe pain and guarded movement, it typically allows some rotation, provided the displacement is not severe enough to cause mechanical locking within the joint.- Differentiating features usually include shortening and **external rotation** of the limb (in displaced fractures), but complete mechanical block of all rotation is less specific than in frank dislocation.*Acetabular fractures*- These fractures cause gross instability and pain, but motion may still be present unless the fracture fragments are severely displaced or impinging on the **femoral head**.- The primary focus of a symptomatic acetabular fracture is significant pain, often exacerbated by axial loading, rather than a total mechanical block of rotation.*Pelvis fracture*- **Pelvis fractures** (especially stable types) cause severe pain and limit weight-bearing, but the hip joint often retains some range of motion, particularly passive rotation, if the acetabulum is intact.- Unstable pelvic ring injuries (e.g., Malgaigne fracture) are defined by instability of the bony ring and potential for hemorrhage, not by complete mechanical inability to rotate the hip joint itself.
Pathology
1 questionsWhich blood is transfused in a patient with a Bombay blood group?
FMGE 2024 - Pathology FMGE Practice Questions and MCQs
Question 21: Which blood is transfused in a patient with a Bombay blood group?
- A. A
- B. O negative (Correct Answer)
- C. AB
- D. B
Explanation: ⚠️ **IMPORTANT CLINICAL NOTE**: Patients with Bombay blood group (Oh phenotype) can **ONLY safely receive Bombay (Oh) blood** from another Bombay donor. **None of the standard ABO blood types listed below are correct or safe** for transfusion. ***Bombay Blood (Oh) - THE ONLY CORRECT ANSWER (Not Listed)*** - Bombay patients lack the **H antigen** due to deficiency of fucosyltransferase enzyme - They produce potent **anti-H, anti-A, and anti-B antibodies** [1] - **Only Bombay (Oh) blood is compatible** - this is the true correct answer - Standard blood banks must maintain rare Bombay donor registries for these patients **Why the listed options are ALL incorrect:** *O negative (Marked as "correct" but clinically WRONG)* - O negative blood **contains the H antigen**, which is present in all standard ABO groups [1] - Transfusing O negative to a Bombay patient causes **severe acute hemolytic transfusion reaction** due to anti-H antibodies - While O negative lacks A and B antigens, the presence of **H antigen makes it incompatible and dangerous** - This is a common misconception that must be avoided in clinical practice *A* - Contains **A antigen and H antigen** - Causes immediate hemolytic reaction from both **anti-A and anti-H antibodies** - Completely incompatible *B* - Contains **B antigen and H antigen** [1] - Causes rapid hemolysis from both **anti-B and anti-H antibodies** - Completely incompatible *AB* - Contains **A antigen, B antigen, and H antigen** - Causes massive hemolytic reaction from all three antibodies - Most incompatible of all standard blood types **Clinical Pearl**: Bombay phenotype is rare (~1 in 10,000 in India). Always maintain autologous blood storage or identify compatible Bombay donors in advance for these patients. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 627-628.