Enlargement of an organ caused by an INCREASE IN THE NUMBER of its normal constituent cells is specifically called:

Fatty liver (hepatic steatosis) can be caused by all of the following mechanisms EXCEPT which one?

Which cells are the primary storage sites for HEPARIN and HISTAMINE in body tissues?

Which disorder of skin pigmentation is most characteristically ASSOCIATED with internal malignant tumors as a paraneoplastic marker?

OSTEOMALACIA is specifically characterized by which of the following?

Which of the following is NOT a premalignant (precancerous) lesion?

Which of the following statements about BENIGN NEOPLASMS is NOT TRUE?

GRADING and STAGING of malignant neoplasms are performed for which of the following purposes?

All of the following are potent chemical CARCINOGENS EXCEPT:

Epigenetic carcinogens do NOT form reactive intermediates and do NOT directly react with DNA. Immunosuppressants, hormones, and plastic fibers are examples of epigenetic carcinogens. Is this statement TRUE or FALSE?

DNA tumor viruses are NOT oncogenic in their natural host even though they replicate freely in those cells. Is this statement TRUE or FALSE?

RNA tumor viruses (retroviruses) do NOT replicate in natural host cells but ARE oncogenic because they transform homologous cells. Is this statement TRUE or FALSE?

All of the following are DNA tumor viruses EXCEPT:

Which of the following statements about EDEMA is NOT CORRECT?

Sodium retention occurs in all of the following conditions EXCEPT:

Which of the following statements about EDEMA is CORRECT?

In active hyperemia, BOTH the venous and arteriolar ends of capillaries are affected, while in passive hyperemia ONLY the venous blood is congested. Is this statement TRUE or FALSE?

Which of the following statements about BLEEDING AND THROMBOSIS is NOT CORRECT?

An embolus is defined as a detached intravascular solid, liquid, or gaseous mass that travels through the bloodstream. Approximately 99% of all emboli arise from a thrombus. Is this TRUE or FALSE?

Pulmonary embolism is the most common PREVENTABLE cause of death in hospitalized patients. Is this statement TRUE or FALSE?

Consumptive coagulopathy, defibrination syndrome, and Disseminated Intravascular Coagulation (DIC) syndrome are all names for the SAME pathological condition. Is this TRUE or FALSE?

Activation of the plasmin-plasminogen system AND circulating fibrinogen degradation products (FDPs) both have ANTICOAGULANT effects. Is this TRUE or FALSE?

Most pulmonary emboli are clinically SILENT and embolic obstruction of middle-sized pulmonary arteries is NOT associated with pulmonary infarction. Is this TRUE or FALSE?

What are the UNCOMMON consequences of repeated or massive pulmonary embolism?

Tissue repair following injury BEGINS at which stage in the healing process?

Which of the following agents can CAUSE inflammation?

During a febrile REACTION (fever), the body temperature rises above normal. This is PRIMARILY because of:

An EXUDATE is an inflammatory extravascular fluid characterized by which specific gravity?

All of the following statements about EDEMA FLUID are correct EXCEPT:

The development of INFLAMMATORY EDEMA is caused by which mechanism(s)?

ANGIOGENESIS (formation of new blood vessels) during inflammation and wound healing involves which of the following steps?

Several growth INHIBITORS are produced during inflammation. Which of the following is NOT a growth inhibitor?

Factors that can MODIFY (alter) the inflammatory response include all of the following EXCEPT:

SPECTRIN is a fibrillar protein component of the red cell membrane skeleton. Derangement of spectrin causes which condition?

The cell death process characterized by nuclear CHROMATIN CONDENSATION and FRAGMENTATION followed by phagocytosis of the cell remnants WITHOUT an inflammatory response is called:

PHAGOLYSOSOMES (secondary lysosomes) originate by which of the following processes?

Hypertrophy of mitochondria (MEGAMITOCHONDRIA — enlarged mitochondria) is seen in all of the following EXCEPT:

Reduced SPERM MOTILITY (asthenozoospermia) leading to male infertility results from which specific intracellular defect?

The MEMBRANE SKELETON of a cell is best defined as which of the following?

Atrophic cells do NOT show diminished function, nor are they dead, but they have only STRUCTURAL REDUCTION of their cellular components. Is this statement TRUE or FALSE?

Which of the following statements about cellular HYPERTROPHY is FALSE?

Which of the following tissues has NO capacity for HYPERPLASIA (cell proliferation in response to demand)?

Which type of necrosis is characterized by the PRESERVATION of the dead cell's basic outline while the nucleus disappears, classically seen in myocardial infarction?

Which is the MOST SPECIFIC and most sensitive test for identifying AMYLOID deposits in tissue sections?

DYSTROPHIC CALCIFICATION differs from METASTATIC CALCIFICATION in which fundamental way?

PSAMMOMA BODIES are concentrically laminated calcified structures. In which of the following tumors are they MOST characteristically found?

Which pathological pigment is formed from HEMOGLOBIN breakdown products and accumulates in tissues after red blood cell destruction?

PRIMARY INTENTION healing of a wound (wound healing by primary intention) is characterized by which of the following?

Which cells in GRANULATION TISSUE are responsible for WOUND CONTRACTION?

KELOID formation represents an abnormality in which phase of wound healing?

Which of the following represents a HALLMARK morphological feature of MALIGNANT neoplasms on histological examination?

What is the difference between a HAMARTOMA and a CHORISTOMA?

ONCOGENES are altered forms of normal cellular genes (proto-oncogenes). Which of the following mechanisms can convert a proto-oncogene into an ONCOGENE?

TUMOR SUPPRESSOR GENES differ from oncogenes in that their LOSS OF FUNCTION leads to cancer. Which of the following is the most important tumor suppressor gene, often called the 'guardian of the genome'?

METAPLASIA is best defined as which of the following?

FREE RADICAL INJURY in cells is primarily neutralized by which cellular defense mechanisms?

ISCHEMIA-REPERFUSION INJURY paradoxically causes WORSE cell damage AFTER blood flow is restored. What is the primary mechanism?

GRANULOMATOUS inflammation is characterized by which of the following key cellular components?

CELL SWELLING (hydropic degeneration/hydropic change) represents an EARLY REVERSIBLE cell injury caused primarily by which mechanism?

LIPOFUSCIN is often called the 'wear and tear' pigment. Which of the following BEST describes its origin and significance?

Which type of NECROSIS is characteristically associated with ACUTE PANCREATITIS involving the peripancreatic adipose tissue?

VIRCHOW'S TRIAD identifies three factors predisposing to THROMBOSIS in blood vessels. What are these three factors?

TUMOR MARKERS are substances that can be measured in the blood to assist in diagnosing and monitoring cancer. Which tumor marker is MOST SPECIFICALLY elevated in HEPATOCELLULAR CARCINOMA (HCC)?

Which process describes the spread of cancer cells through the LYMPHATICS or BLOOD to distant organs, forming new tumor colonies?

ANTHRACOSIS (coal dust pigment) in the lung produces which COLOR of pigment deposition and is associated with which clinical condition?

Which type of inflammation SPECIFICALLY involves fibrin-rich exudate formation on serosal surfaces (pleural, pericardial, peritoneal), giving a BREAD AND BUTTER appearance?

An ABSCESS differs from a SINUS and a FISTULA. How are these three terms correctly distinguished?

LINES OF ZAHN are histological features used to distinguish ANTE-MORTEM thrombus from POST-MORTEM blood clot. What do lines of Zahn represent?

CELLULAR SENESCENCE refers to a state where cells PERMANENTLY STOP DIVIDING but remain metabolically active. Which mechanism is PRIMARILY responsible for replicative senescence?

In CHRONIC INFLAMMATION, which cell type is the PREDOMINANT inflammatory cell (compared to neutrophils in acute inflammation)?

INFARCTION refers to an area of ISCHEMIC NECROSIS resulting from vascular occlusion. Which type of infarct typically appears RED (hemorrhagic)?

The WARBURG EFFECT in cancer cells describes which metabolic phenomenon?

CARCINOMA IN SITU (CIS) is defined as a neoplasm with which of the following characteristics?

AUTOPHAGY ('self-eating') is the process by which a cell degrades its own cytoplasmic components. What is the PRIMARY physiological function of autophagy?

CONTACT INHIBITION of cell growth is a property of NORMAL cells. What happens to contact inhibition in malignant cells?

Which chemical carcinogen is the CLASSIC cause of ANGIOSARCOMA of the liver?

GANGRENE is a special form of necrosis. Which type of gangrene involves SUPERIMPOSED PUTREFACTIVE BACTERIAL INFECTION producing foul-smelling, black, wet tissue?

In the PROLIFERATIVE PHASE of wound healing, which type of COLLAGEN is FIRST synthesized, and how does it change during MATURATION?

SHOCK is a state of systemic tissue HYPOPERFUSION. Which type of shock occurs due to massive BLOOD or FLUID LOSS resulting in reduced cardiac preload?

ORGAN DAMAGE IN SHOCK — which organ shows the MOST characteristic pathological lesion called ACUTE TUBULAR NECROSIS (ATN) as a consequence of systemic hypoperfusion?

Which GENETIC SYNDROME is associated with the development of MULTIPLE COLONIC POLYPS (hundreds to thousands) and has a near 100% risk of colorectal CARCINOMA if untreated?

What are the CHARACTERISTIC features of COAGULATIVE NECROSIS at the ELECTRON MICROSCOPY level that indicate IRREVERSIBLE cell injury?

TERATOMA is a type of germ cell tumor containing tissues derived from multiple germ layers. A MATURE CYSTIC TERATOMA (dermoid cyst) of the ovary is characterized by which of the following?

CHRONIC PASSIVE VENOUS CONGESTION of the liver produces which characteristic GROSS and HISTOLOGICAL appearances?

HYALINE CHANGE refers to the accumulation of homogeneous, GLASSY PINK (eosinophilic) material in cells or extracellular matrix. Which of the following is an example of INTRACELLULAR hyaline change?

RADIATION-INDUCED carcinogenesis causes cancer through which primary mechanism?

TRANSUDATE differs from EXUDATE not only in specific gravity but also in PROTEIN content. Which of the following correctly describes the TRANSUDATE?

MALLORY-DENK BODIES in alcoholic hepatitis are best described as which type of histological structure?

ENDOMETRIAL HYPERPLASIA is a precursor lesion to ENDOMETRIAL ADENOCARCINOMA. Which hormonal state is most commonly responsible?

COMPLEMENT SYSTEM activation is an important component of humoral immune responses. Which pathway is activated by ANTIGEN-ANTIBODY COMPLEXES (immune complexes)?

BENIGN vs MALIGNANT tumors — which of the following features MOST RELIABLY distinguishes a malignant neoplasm from a benign one?

TELOMERASE enzyme activity is elevated in which type of cells, and how is this relevant to cancer biology?

The HALLMARKS OF CANCER, as conceptualized in modern oncology, include which of the following acquired capabilities in cancer cells?

The UNFOLDED PROTEIN RESPONSE (UPR) is triggered by which cellular condition, and what is the purpose of this response?

WOUND STRENGTH following surgical repair reaches what MAXIMUM PERCENTAGE of the original unwounded tissue strength?

HYPERTROPHIC SCARRING and KELOID both represent excessive fibrosis after wound healing. Which of the following correctly describes HYPERTROPHIC SCAR?

HYPERSENSITIVITY REACTIONS are classified by Gell and Coombs into four types. Type II hypersensitivity is characterized by which mechanism?

SYSTEMIC LUPUS ERYTHEMATOSUS (SLE) is an AUTOIMMUNE DISEASE with widespread organ involvement. Which IMMUNOPATHOLOGICAL mechanism primarily drives organ damage in SLE?

LEUKOCYTE RECRUITMENT to sites of inflammation involves sequential steps. What is the CORRECT sequence of leukocyte (neutrophil) recruitment from bloodstream to tissue?

EMPHYSEMA is a pathological condition involving permanent destructive ENLARGEMENT of air spaces distal to the terminal bronchiole. Which type is associated with SMOKING?

SICKLE CELL DISEASE results from a POINT MUTATION in the beta-globin gene. What amino acid substitution produces HbS?

CHRONIC GRANULOMATOUS DISEASE (CGD) is an inherited immune deficiency in which patients develop recurrent infections with catalase-POSITIVE organisms. What is the underlying defect?

PARANEOPLASTIC SYNDROMES are signs and symptoms caused by cancer that occur DISTANT from the tumor itself. Which statement about paraneoplastic syndromes is CORRECT?

FIBRINOID NECROSIS is a type of necrosis unique to BLOOD VESSEL WALLS. In which conditions is fibrinoid necrosis most characteristically found?

EDEMA in NEPHROTIC SYNDROME differs mechanistically from edema in CONGESTIVE HEART FAILURE. What is the PRIMARY mechanism in NEPHROTIC SYNDROME edema?

INTRACELLULAR ACCUMULATIONS in pathological conditions include various substances. GLYCOGEN ACCUMULATION in cells is best demonstrated by which stain?

In GRANULATION TISSUE, what is the CHARACTERISTIC appearance that distinguishes it from fibrous scar tissue on gross inspection?

In HEPATOCELLULAR CARCINOMA (HCC), which PRE-EXISTING CONDITION is the MOST COMMON predisposing factor GLOBALLY?

CERVICAL INTRAEPITHELIAL NEOPLASIA (CIN) is caused by HPV infection. Which of the following correctly describes the molecular mechanism by which HIGH-RISK HPV leads to cervical carcinoma?

WILMS TUMOR (nephroblastoma) in children contains which CHARACTERISTIC HISTOLOGICAL triad of components?

ATHEROSCLEROSIS is the most common cause of cardiovascular disease. Which cell type is CENTRAL to the formation of the ATHEROSCLEROTIC PLAQUE (atheromatous plaque)?

PROGRAMMED NECROSIS (NECROPTOSIS) differs from apoptosis and standard necrosis. What is the key molecular mediator of necroptosis?

TRANSFUSION-RELATED ACUTE LUNG INJURY (TRALI) is a serious complication of blood transfusion. What is the PRIMARY immunological mechanism?

BENIGN PROSTATIC HYPERPLASIA (BPH) involves glandular and stromal HYPERPLASIA in which ZONE of the prostate?

HEREDITARY HEMOCHROMATOSIS is a genetic condition causing iron overload. Which GENE is mutated and which ORGAN is most severely affected?

TRISOMY 21 (Down syndrome) is associated with which specific PATHOLOGICAL PROCESS in later life that makes it relevant to histopathology?

CARCINOID TUMOR of the APPENDIX is the MOST COMMON tumor of the appendix. Which of the following best describes its malignant behavior?

TUMOR MICROENVIRONMENT (TME) refers to the non-malignant cells and matrix surrounding a tumor. Which cell type in the TME is considered to PROMOTE tumor growth and immunosuppression?

WILSON'S DISEASE is a genetic disorder of COPPER METABOLISM. Which histopathological feature is CHARACTERISTIC of Wilson's disease liver biopsy?

PSEUDOMEMBRANOUS COLITIS caused by Clostridioides difficile shows which CHARACTERISTIC HISTOLOGICAL appearance?

ASCHOFF BODIES are a PATHOGNOMONIC histological finding in RHEUMATIC FEVER. What do they represent morphologically?

REACTIVE OXYGEN SPECIES (ROS) cause cell injury by damaging which cellular components?

FAMILIAL HYPERCHOLESTEROLEMIA (FH) is a genetic condition with dramatically increased LDL levels. Which is the MOST COMMON genetic mutation causing FH?

ONCOFETAL ANTIGENS such as CARCINOEMBRYONIC ANTIGEN (CEA) are re-expressed in cancer. What is the clinical significance of CEA?

GRAFT-VERSUS-HOST DISEASE (GvHD) occurs after allogeneic hematopoietic stem cell transplantation. Which cells are RESPONSIBLE for causing GvHD?

THROMBOTIC THROMBOCYTOPENIC PURPURA (TTP) is characterized by which PATHOLOGICAL MECHANISM?

What is the HISTOLOGICAL CLASSIFICATION system used for HODGKIN LYMPHOMA and which subtype is MOST COMMON?

MICROSATELLITE INSTABILITY (MSI) in colorectal cancer results from defective DNA MISMATCH REPAIR (MMR). Which syndrome is associated with GERMLINE MMR gene mutations?

GIANT CELL ARTERITIS (Temporal Arteritis) is the most common VASCULITIS in individuals over 50 years of age. Which artery is most commonly affected and what is the most feared complication?

DUCHENNE MUSCULAR DYSTROPHY (DMD) has a characteristic histopathological appearance on MUSCLE BIOPSY. Which of the following BEST describes the microscopic findings?

SQUAMOUS CELL CARCINOMA of the skin is associated with ULTRAVIOLET (UV) radiation. Which UV wavelength and DNA lesion are MOST RESPONSIBLE?

NORMAL TISSUE ARCHITECTURE is maintained by a BALANCE between cell PROLIFERATION and APOPTOSIS. Which of the following best describes how this balance is DISRUPTED in cancer?

CARDIAC TAMPONADE occurs when fluid accumulation in the PERICARDIAL SPACE compresses the heart. What is the MINIMUM amount of RAPIDLY accumulated fluid required to cause significant cardiac tamponade?

HYPERALDOSTERONISM (CONN'S SYNDROME) is characterized by what PATHOLOGICAL change in the adrenal gland?

MYOCARDIAL INFARCTION (MI) shows a TEMPORAL SEQUENCE of histopathological changes. At 24 HOURS post-MI, what is the histological appearance?

INTRANUCLEAR INCLUSIONS are seen in cells infected by certain viruses. Which virus characteristically produces INTRANUCLEAR inclusions called 'OWL EYE' inclusions in CYTOMEGALOVIRUS (CMV)-infected cells?

EPIDIDYMITIS and ORCHITIS have different CAUSATIVE ORGANISMS in different age groups. In MEN UNDER 35 YEARS, which organism is the MOST COMMON cause?

REACTIVE LYMPHADENOPATHY is lymph node enlargement from a NON-MALIGNANT cause. Which of the following histological PATTERNS is associated with FOLLICULAR HYPERPLASIA (B-cell stimulation)?

HASHIMOTO'S THYROIDITIS is the most common cause of hypothyroidism in iodine-sufficient countries. What is the HISTOLOGICAL HALLMARK of Hashimoto's thyroiditis?

GLIOBLASTOMA (GBM) is the most common and MOST AGGRESSIVE PRIMARY BRAIN TUMOR. What are the HISTOPATHOLOGICAL features that distinguish GBM from lower-grade gliomas?

LEPROSY has two main POLAR TYPES determined by the HOST IMMUNE RESPONSE. What is the histological difference between TUBERCULOID and LEPROMATOUS leprosy?

CROHN'S DISEASE and ULCERATIVE COLITIS are the two major INFLAMMATORY BOWEL DISEASES (IBD). Which of the following histological features is specific to CROHN'S DISEASE and NOT seen in ulcerative colitis?