cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.34808/97x4-gy94
title: Anogenital (venereal) warts - Female, 55 - Tissue image [6300730028277451]

description: This is the histopathological image of VULVA tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 55Clinical description: Condylomata acuminata.Gender: FemaleDiagnosis:Classification: ICD-10_10-20Classification code: Chapter I - Certain infectious and parasitic diseasesDiagnosis: Anogenital (venereal) wartsResult of the histopathological examination: Condylomata acuminata.Sample:Material: FFPECollecting method: Excision of lesionsTopography: FEMALE GENITAL ORGANSOrgan: VULVATissue: Skin of vulvaType of staining: positive/HEStaining: Not applicableAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.34808/2j91-3c77
title: Squamous cell carcinoma, keratinizing, NOS - Male, 76 - Tissue image [6300730028276871]

description: This is the histopathological image of SKIN tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 76Clinical description: Ulcerated tumor of skin of nose with dimensions 1,7 x2,2 cm.Gender: MaleDiagnosis:Classification: ICD-O_3.2Classification code: SQUAMOUS CELL NEOPLASMSDiagnosis: Squamous cell carcinoma, keratinizing, NOSResult of the histopathological examination: Squamous cel  carcinoma of skin, keratinizing (G2).Sample:Material: FFPECollecting method: Excision of lesionsTopography: SKINOrgan: SKINTissue: Skin of noseType of staining: positive/HEStaining: Not applicableAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.34808/j5f9-jj14
title: Polyp of cervix uteri - Female, 64 - Tissue image [6300730028249741]

description: This is the histopathological image of CERVIX UTERI tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 64Clinical description: Polyp of uterus cervix.Gender: FemaleDiagnosis:Classification: ICD-10_10-20Classification code: Chapter XIV - Diseases of the genitourinary systemDiagnosis: Polyp of cervix uteriResult of the histopathological examination: Polyp of uterine cervix.Sample:Material: FFPECollecting method: Excision of lesionsTopography: FEMALE GENITAL ORGANSOrgan: CERVIX UTERITissue: Cervical canalType of staining: positive/HEStaining: Not applicableAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.34808/ktak-m136
title: Squamous cell carcinoma, keratinizing, NOS - Female, 58 - Tissue image [6300730028262981]

description: This is the histopathological image of VULVA tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 58Clinical description: Ulcerated tumor of vulva with dimensions 0,8 x 0,7 x 0,5 cm.Gender: FemaleDiagnosis:Classification: ICD-O_3.2Classification code: SQUAMOUS CELL NEOPLASMSDiagnosis: Squamous cell carcinoma, keratinizing, NOSResult of the histopathological examination: Squamous cell carcinoma, keratinizing (G1).Sample:Material: FFPECollecting method: Excision of lesionsTopography: FEMALE GENITAL ORGANSOrgan: VULVATissue: Vulva, NOSType of staining: positive/HEStaining: Not applicableAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.34808/83f1-1x72
title: CERVIX UTERI, Exocervix - Female, 37 - Cell image [6300730028254721]

description: This is the histopathological image of CERVIX UTERI cell sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 37Clinical description: Prophylaxis.Gender: FemaleDiagnosis:Classification: HealthyClassification code: Diagnosis: Result of the histopathological examination: NILM (Negative for Intraepithelial Lesion or Malignancy). Papsmear contains multiple superficial epithelial cells (partly overlapping), groups of glandular cervical cells, sparse granulocytes.Sample:Material: SurePathCollecting method: Exfoliative cytologyTopography: FEMALE GENITAL ORGANSOrgan: CERVIX UTERITissue: ExocervixType of staining: positive/HCStaining: PapanicolaouAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.34808/0fe4-wq89
title: Cylindroma of skin - Female, 49 - Tissue image [6300730028248981]

description: This is the histopathological image of SKIN tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 49Clinical description: Light brown lesion of skin of  head with dimensions 0,9 x 1,0 x 0,25 cm.Gender: FemaleDiagnosis:Classification: ICD-O_3.2Classification code: ADENOMAS AND ADENOCARCINOMASDiagnosis: Cylindroma of skinResult of the histopathological examination: Cylindroma.Sample:Material: FFPECollecting method: Excision of lesionsTopography: SKINOrgan: SKINTissue: Skin of head, NOSType of staining: positive/HEStaining: Not applicableAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.34808/ty8g-sv20
title: Hidradenoma papilliferum - Female, 40 - Tissue image [6300730028275251]

description: This is the histopathological image of VULVA tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 40Clinical description: Lesion of skin of vulva.Gender: FemaleDiagnosis:Classification: ICD-O_3.2Classification code: ADNEXAL AND SKIN APPENDAGE NEOPLASMSDiagnosis: Hidradenoma papilliferumResult of the histopathological examination: Hidradenoma papilliferum.Sample:Material: FFPECollecting method: Excision of lesionsTopography: FEMALE GENITAL ORGANSOrgan: VULVATissue: Skin of vulvaType of staining: positive/HEStaining: Not applicableAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.34808/hp8q-5f59
title: Benign mammary dysplasia, unspecified - Female, 50 - Tissue image [6300730028279591]

description: This is the histopathological image of BREAST tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 50Clinical description: Palpable tumor of right breast.Gender: FemaleDiagnosis:Classification: ICD-10_10-20Classification code: Chapter XIV - Diseases of the genitourinary systemDiagnosis: Benign mammary dysplasia, unspecifiedResult of the histopathological examination: Fibrocystic changes, usual hyperplasia (UDH), adenosis, colagenous spherulosis (SMM-HC and p63 + in myoepithelial cells).Sample:Material: FFPECollecting method: Surgical specimenTopography: BREASTOrgan: BREASTTissue: Lower-outer quadrant of breastType of staining: positive/HCStaining: P.A.S. (Periodic Acid and Schiff)Antibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.34808/6ak8-hm29
title: Squamous cell carcinoma in situ, NOS - Male, 81 - Tissue image [6300730028278911]

description: This is the histopathological image of SKIN tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 81Clinical description: Lesion of skin of head with dimensions 1,6 x 1,5 cm.Gender: MaleDiagnosis:Classification: ICD-O_3.2Classification code: SQUAMOUS CELL NEOPLASMSDiagnosis: Squamous cell carcinoma in situ, NOSResult of the histopathological examination: Squamous cell carcinoma in situ of skin.Sample:Material: FFPECollecting method: Excision of lesionsTopography: SKINOrgan: SKINTissue: Skin of head, NOSType of staining: positive/HEStaining: Not applicableAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.34808/mv3d-f422
title: Hibernoma - Male, 26 - Tissue image [6300730028268251]

description: This is the histopathological image of CONNECTIVE, SUBCUTANEOUS AND OTHER SOFT TISSUES tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 26Clinical description: Tumor of subcutaneous tissue of buttock.Gender: MaleDiagnosis:Classification: ICD-O_3.2Classification code: LIPOMATOUS NEOPLASMSDiagnosis: HibernomaResult of the histopathological examination: Hibernoma.Sample:Material: FFPECollecting method: Excision of lesionsTopography: CONNECTIVE, SUBCUTANEOUS AND OTHER SOFT TISSUESOrgan: CONNECTIVE, SUBCUTANEOUS AND OTHER SOFT TISSUESTissue: Connective, subcutaneous and other soft tissues of buttockType of staining: positive/HEStaining: Not applicableAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.34808/4ewm-0s07
title: Benign mammary dysplasia, unspecified - Female, 50 - Tissue image [6300730028266721]

description: This is the histopathological image of BREAST tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 50Clinical description: Palpable tumor of right breast.Gender: FemaleDiagnosis:Classification: ICD-10_10-20Classification code: Chapter XIV - Diseases of the genitourinary systemDiagnosis: Benign mammary dysplasia, unspecifiedResult of the histopathological examination: Fibrocystic changes, usual hyperplasia (UDH), adenosis, colagenous spherulosis (SMM-HC and p63 + in myoepithelial cells).Sample:Material: FFPECollecting method: Surgical specimenTopography: BREASTOrgan: BREASTTissue: Lower-outer quadrant of breastType of staining: positive/HEStaining: Not applicableAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.34808/ygyv-qq03
title: Osteoma, NOS - Male, 32 - Tissue image [6300730028275001]

description: This is the histopathological image of SKIN tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 32Clinical description: Osteoma of external ear.Gender: MaleDiagnosis:Classification: ICD-O_3.2Classification code: OSSEOUS AND CHONDROMATOUS NEOPLASMSDiagnosis: Osteoma, NOSResult of the histopathological examination: Osteoma.Sample:Material: FFPECollecting method: Excision of lesionsTopography: SKINOrgan: SKINTissue: External auricular canalType of staining: positive/HEStaining: Not applicableAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.34808/8ta2-5190
title: LYMPH NODES, Lymph node face, head ,neck - Female, 45 - Tissue image [6300730028267041]

description: This is the histopathological image of LYMPH NODES tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 45Clinical description: Nodule of the thyroid.Gender: FemaleDiagnosis:Classification: HealthyClassification code: Diagnosis: Result of the histopathological examination: The lymph node is free of metastasis.Sample:Material: FFPECollecting method: Surgical specimenTopography: LYMPH NODESOrgan: LYMPH NODESTissue: Lymph node face, head ,neckType of staining: positive/HEStaining: Not applicableAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.34808/vqw2-jm22
title: Nontoxic multinodular goitre - Female, 46 - Tissue image [6300730028268161]

description: This is the histopathological image of THYROID GLAND tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 46Clinical description: Thyroid goiter.Gender: FemaleDiagnosis:Classification: ICD-10_10-20Classification code: Chapter IV - Endocrine, nutritional and metabolic diseasesDiagnosis: Nontoxic multinodular goitreResult of the histopathological examination: Multinodular goiter.Sample:Material: FFPECollecting method: Surgical specimenTopography: THYROID AND OTHER ENDOCRINE GLANDSOrgan: THYROID GLANDTissue: Thyroid, NOSType of staining: positive/HEStaining: Not applicableAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.34808/37nc-r077
title: Giant cell tumor of bone, NOS - Male, 21 - Tissue image [6300730028244641]

description: This is the histopathological image of BONES, JOINTS AND ARTICULAR CARTILAGE OF LIMBS tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 21Clinical description: Tumor of femoral bone.Gender: MaleDiagnosis:Classification: ICD-O_3.2Classification code: GIANT CELL TUMORSDiagnosis: Giant cell tumor of bone, NOSResult of the histopathological examination: Giant cell tumor of bone.Sample:Material: FFPECollecting method: Excision of lesionsTopography: BONES, JOINTS and ARTICULAR CARTILAGEOrgan: BONES, JOINTS AND ARTICULAR CARTILAGE OF LIMBSTissue: FemurType of staining: positive/HEStaining: Not applicableAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.34808/5pwf-cq18
title: Capillary hemangioma - Male, 68 - Tissue image [6300730028264591]

description: This is the histopathological image of SKIN tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 68Clinical description: Light brown lesion of skin of buttock with dimensions 1,8 x 1,7 cm.Gender: MaleDiagnosis:Classification: ICD-O_3.2Classification code: BLOOD VESSEL TUMORSDiagnosis: Capillary hemangiomaResult of the histopathological examination: Capillary hemangioma.Sample:Material: FFPECollecting method: Excision of lesionsTopography: SKINOrgan: SKINTissue: Skin of buttockType of staining: positive/HEStaining: Not applicableAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.34808/fabj-cm63
title: Cylindroma of skin - Female, 65 - Tissue image [6300730028245731]

description: This is the histopathological image of SKIN tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 65Clinical description: Tumor of skin of nose with dimensions 1,9 x 1,7 x 1,3 cm.Gender: FemaleDiagnosis:Classification: ICD-O_3.2Classification code: ADENOMAS AND ADENOCARCINOMASDiagnosis: Cylindroma of skinResult of the histopathological examination: Cylindroma.Sample:Material: FFPECollecting method: Excision of lesionsTopography: SKINOrgan: SKINTissue: Skin of noseType of staining: positive/HEStaining: Not applicableAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.34808/05aj-0j03
title: CERVIX UTERI, Exocervix - Female, 49 - Cell image [6300730028261801]

description: This is the histopathological image of CERVIX UTERI cell sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 49Clinical description: Prophylaxis. HRT.Gender: FemaleDiagnosis:Classification: HealthyClassification code: Diagnosis: Result of the histopathological examination: NILM (Negative for Intraepithelial Lesion or Malignancy). Papsmear contains multiple superficial epithelial cells (partly overlapping), multiple groups of glandular cervical cells, quite numerous scattered granulocytes.Sample:Material: SurePathCollecting method: Exfoliative cytologyTopography: FEMALE GENITAL ORGANSOrgan: CERVIX UTERITissue: ExocervixType of staining: positive/HCStaining: PapanicolaouAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.34808/6zc8-2z98
title: Papillary hidradenoma - Female, 52 - Tissue image [6300730028266801]

description: This is the histopathological image of VULVA tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 52Clinical description: Lesion of skin of vulva.Gender: FemaleDiagnosis:Classification: ICD-O_3.2Classification code: ADNEXAL AND SKIN APPENDAGE NEOPLASMSDiagnosis: Papillary hidradenomaResult of the histopathological examination: Papillary hidradenoma.Sample:Material: FFPECollecting method: Excision of lesionsTopography: FEMALE GENITAL ORGANSOrgan: VULVATissue: Skin of vulvaType of staining: positive/HEStaining: Not applicableAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.6084/m9.figshare.14910015
title: Net Effects: ASX200 Network data for 2015 and 2018

description: Network data describing board members of ASX200 companies in 2015 and 2018<br>
DOI: 10.34808/sgss-wk44
title: Intradermal nevus - Male, 29 - Tissue image [6300730028274911]

description: This is the histopathological image of SKIN tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 29Clinical description: Lesion of skin of trunk, diameter 0,5 cm.Gender: MaleDiagnosis:Classification: ICD-O_3.2Classification code: NEVI AND MELANOMASDiagnosis: Intradermal nevusResult of the histopathological examination: Dermal melanocytic nevus.Sample:Material: FFPECollecting method: Excision of lesionsTopography: SKINOrgan: SKINTissue: Skin of trunkType of staining: positive/HEStaining: Not applicableAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.6084/m9.figshare.14910015.v1
title: Net Effects: ASX200 Network data for 2015 and 2018

description: Network data describing board members of ASX200 companies in 2015 and 2018<br>
DOI: 10.34808/gmxe-wq61
title: Autoimmune thyroiditis - Female, 45 - Tissue image [6300730028259641]

description: This is the histopathological image of THYROID GLAND tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 45Clinical description: Hypothyroidism.Gender: FemaleDiagnosis:Classification: ICD-10_10-20Classification code: Chapter IV - Endocrine, nutritional and metabolic diseasesDiagnosis: Autoimmune thyroiditisResult of the histopathological examination: Hashimoto thyroiditis.Sample:Material: FFPECollecting method: Surgical specimenTopography: THYROID AND OTHER ENDOCRINE GLANDSOrgan: THYROID GLANDTissue: Thyroid glandType of staining: positive/HEStaining: Not applicableAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk
DOI: 10.34808/377c-k965
title: Nontoxic multinodular goitre - Female, 46 - Tissue image [6300730028268921]

description: This is the histopathological image of THYROID GLAND tissue sample obtained in Medical University Gdańsk and deposited in ZMDL-GUMED. The sample image was taken using: Pannoramic 250 3DHistech slide scanner (20x magnification) and saved to DICOM format. The detailed information about the patient, sample, and diagnosis are as follows: Patient:Age: 46Clinical description: Thyroid goiter.Gender: FemaleDiagnosis:Classification: ICD-10_10-20Classification code: Chapter IV - Endocrine, nutritional and metabolic diseasesDiagnosis: Nontoxic multinodular goitreResult of the histopathological examination: Multinodular goiter.Sample:Material: FFPECollecting method: Surgical specimenTopography: THYROID AND OTHER ENDOCRINE GLANDSOrgan: THYROID GLANDTissue: Thyroid, NOSType of staining: positive/HEStaining: Not applicableAntibody: Not applicableTechnology:Equipment: Pannoramic 250 3DHistechLens: 20xOrganization:Source: Medical University Gdańsk